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                             COLLABORATION AGREEMENT

     This COLLABORATION AGREEMENT (the "Agreement"), effective as of December
31, 1995 (the "Effective Date"), is made by and between Pharmacopeia, Inc., a
Delaware corporation, having a principal place of business at 101 College Road
East, Princeton, New Jersey 08540 ("Pharmacopeia"), and Bayer Corporation, an
Indiana corporation, having a principal place of business at 400 Morgan Lane,
West Haven, Connecticut 06516 ("Bayer").

                                   BACKGROUND

     A.   Pharmacopeia has developed novel proprietary methods for the
generation and screening of encoded compound libraries. Pharmacopeia believes
that its technology, by rapidly producing diverse and targeted compound
libraries will accelerate the drug discovery process and increase productivity
of drug discovery programs.

     B.   Bayer and Pharmacopeia desire to collaborate to design, synthesize and
screen compound libraries to identify Lead Compounds and potentially Development
Candidates (as defined herein) based on Bayer proprietary compound(s) which have
activity in the Designated Field.

     C.   On even date herewith, Bayer and Pharmacopeia have entered into a
Random Library Agreement pursuant to which Pharmacopeia will deliver to Bayer
certain Random Libraries for screening.

     D.   Bayer and Pharmacopeia are entering into a Stock Purchase Agreement
pursuant to which Bayer has agreed to purchase, and Pharmacopeia has agreed to
sell to Bayer, shares of Pharmacopeia Common Stock as set forth herein.

     NOW, THEREFORE, for and in consideration of the covenants, conditions, and
undertakings hereinafter set forth, it is agreed by and between the parties as
follows:

                                    ARTICLE I
                                   DEFINITIONS

     1.1  "AFFILIATE" shall mean any corporation or other business entity which
during the term of this Agreement controls, is controlled by or is under common
control with Pharmacopeia or Bayer but only for so long as such entity controls,
is controlled by, or is under common control with Pharmacopeia or Bayer. For
this purpose, control means the possession of the power to direct or cause the
direction of the management and the policies of an entity whether through
ownership directly or indirectly of fifty percent (50%) or more of the stock
entitled to vote, and for non-stock organizations, the right to receive over
fifty percent (50%) of the profits by contract or otherwise, or if not meeting
the preceding requirements, any company owned or controlled by or owning or

<PAGE>

controlling Pharmacopeia or Bayer at the maximum control or ownership right 
permitted in a country where such company exists.

     1.2  "AGREEMENT COMPOUNDS" shall mean Designated Compounds, Other 
Compounds and Derivative Compounds. Agreement Compounds shall not include 
Excluded Products.

     1.3  "AGREEMENT PRODUCTS" shall mean any product, including bulk active 
ingredients, containing an Agreement Compound. Agreement Products shall not 
include Excluded Products.

     1.4  "BAYER TECHNOLOGY" shall mean any patent application filed after 
Bayer's notice to Pharmacopeia pursuant to Section 2.1(a) below and before 
the Cutoff Date (or a division, continuation or continuation-in-part of any 
such patent application) or any patent issued on any of the preceding, 
including reissues or re-examinations, which is owned, in whole or part, by 
Bayer or its Affiliates at any time during the term of this Agreement that 
claims the synthesis, composition-of-matter or method of use of a Library 
Compound or Agreement Compound.

     1.5  "COLUMBIA LICENSE" shall mean that certain License Agreement 
effective as of July 16, 1993, as amended and restated as of October 6, 1995, 
entered by and between Pharmacopeia, Inc.,  the Trustees of Columbia 
University in the City of New York and the Cold Spring Harbor Laboratory.

     1.6  "CONSUMER PRICE INDEX" or "CPI" means the Consumer Price Index, All 
Urban Consumers, as published by the U.S. Bureau of Labor Statistics.

     1.7  "CUTOFF DATE" means the    [ * * *]    anniversary of the end of 
the Research Program.

     1.8  "DERIVATIVE COMPOUND" shall mean any compound that demonstrates 
activity in the Designated Field, or outside the Designated Field, as the 
case may be, which is derived by Pharmacopeia, or Bayer or its Affiliates or 
Sublicensees, or by a third party under authority from Bayer from a Library 
Compound. As used herein, a compound shall be deemed to have been "derived 
from" a Library Compound if it is a chemical modification made to a Library 
Compound which: (i) results from a chemical synthesis program based on a 
Library Compound, (ii) is based on structure-activity data relating to 
Library Compounds (with or without activity in the Designated Field), or 
(iii) is conceived and actually or constructively reduced to practice by 
Pharmacopeia, or Bayer or its Affiliates or Sublicensees, or by another third 
party under authority from Bayer in connection with the activities described 
in (i) or (ii) above. It is understood that "Derivative Compound"  shall 
include any compound derived  from a Library Compound or from another 
Derivative Compound. It is further understood that a compound with activity 
in the Designated Field which meets the criteria above shall be a

[ * * *  Confidential Treatment Requested. ]

                                       -2-

<PAGE>

Derivative Compound, even if such compound also has biological activity 
outside the Designated Field. It is further understood that Derivative 
Compounds shall not include compounds "derived from" Excluded Products.

     1.9  "DESIGNATED COMPOUND" shall mean  any compound which demonstrates 
activity in the Designated Field in accordance with the criteria established 
by the parties pursuant to Section 2.1(d) in  a Library screened by 
Pharmacopeia during the term of and in the course of performing the Research 
Program. It is understood that Designated Compounds shall include compound(s) 
which also have biological activity outside the Designated Field, provided 
they have the level of activity with respect to the Designated Target as 
established by the parties pursuant to Section 2.1(d).

     1.10  "DESIGNATED FIELD" shall mean the therapeutic or prophylactic 
treatment or prevention of diseases and conditions in humans and animals, or 
a diagnostic use, through the use of a compound that has activity with 
respect to a Designated Target, even if such compound also has biological 
activity outside the Designated Target.

     1.11  "DESIGNATED TARGET" shall mean the molecular target which the 
parties agree is the subject of the Research Program subject to Section 2.1 
below.

     1.12  "DEVELOPMENT CANDIDATE" shall have the meaning set forth in 
Section 6.2.5.

     1.13  "EXCLUDED PRODUCT" shall mean any product for use in the 
Designated Field which contains:

           (i)  a proprietary chemical compound which Bayer or its Affiliates 
has developed independently of the intellectual property developed through 
the activities set forth in subsections 1.8(i) - (iii), which prior to the 
Effective Date, Bayer or a Bayer Affiliate has synthesized and either tested 
or has expressed an intention to test for activity in the Designated Field, 
in each case, as shown by contemporaneous documentation, provided any such 
compound demonstrates activity in the Designated Field, subject to reasonable 
verification;

           (ii)  any Derivative Compound conceived and synthesized by Bayer 
or its Affiliates after the Cutoff Date, except if such a conceived compound 
falls within the scope of a patent within the Licensed Technology, Joint 
Inventions or Bayer Technology either (a) issued as of the Cutoff Date, or 
(b) issued from a patent application pending as of the Cutoff Date (or a 
division or continuation of such an application) and issued subsequent to the 
Cutoff Date;

           (iii)  a compound other than those described in subsections (i) or 
(ii) above which is conceived and synthesized by Bayer or its Affiliates or 
by a third party under the authority of Bayer after the end of the Research 
Program independently of the

                                       -3-

<PAGE>

intellectual property developed through the activities set forth in 
subsections (i)-(iii) of Section 1.8, as shown by contemporaneous 
documentation; or

           (iv)  any Derivative Compound which Bayer incorporates into its 
in-house chemical sample collection, and

                 (a)  which is determined by Bayer or its Affiliates to have 
biological activity with respect to any additional target against which no 
Library Compound was screened, and which Bayer elects to commercialize solely 
for use with respect to such additional target, or

                 (b)  which is determined by Bayer or its Affiliates to have 
biological activity with respect to a target against which no Library 
Compound displayed any activity, and which Bayer elects to commercialize 
solely for use with respect to such target.

     1.14  "EXCLUDED TECHNOLOGY" means any intellectual property owned or 
licensed by Pharmacopeia and its Affiliates relating to the creation or use 
of encoded combinatorial libraries, tag and/or market compound engineering 
and encoding, proprietary database and computational technology and/or high 
throughput screening assays.

     1.15  "EXCLUSIVITY PERIOD" shall mean:

           1.15.1  with respect to all Library Compounds contained in any 
Bayer Random Library, that period commencing on the date Pharmacopeia 
provides Bayer notice that all compounds of any such Library are available to 
be shipped to Bayer (the "Notice Date") and continuing until  [ * * * ]   the 
Notice Date, or such later date as may  be established under Section 2.4.1 of 
the Random Library Agreement; and

          1.15.2  for each Designated Compound, that period commencing with 
the decoding of such Designated Compound and continuing until  [ * * * ]   
within the Existing Patent Rights and/or Future Patent Rights claiming such 
Designated Compound.

          1.15.3  with respect to any Focused Library screened by 
Pharmacopeia in connection with the Research Program, for all Library 
Compounds contained in that Library, that period commencing on the first day 
of the Initial Term and continuing until  [ * * * ]  in such Focused 
Library.

     1.16  "FDA" shall mean the U.S. Food and Drug Administration or any 
corresponding foreign registration or regulatory authority.

[ * * *  Confidential Treatment Requested. ]

                                       -4-

<PAGE>

     1.17  "IND" shall mean an Investigational New Drug application, as 
defined in the U.S. Food, Drug and Cosmetic Act and the regulations 
promulgated thereunder for initiating clinical trials in the United States, 
or any corresponding foreign application, registration or certification.

     1.18  "INITIAL TERM" shall mean the period commencing on the earlier of 
(i) July 1, 1996, or (ii) the date on which the Research Plan is adopted for 
the first Designated Field pursuant to Section 2.1(e) below, and terminating 
on the second anniversary of the date specified in (ii).

     1.19  "LEAD COMPOUND" shall have the meaning set forth in Section 6.2.4.

     1.20  "LIBRARY" shall mean any chemical compound library prepared by or 
on behalf of Pharmacopeia. Libraries shall be comprised of two types, as 
follows:

           1.20.1  "BAYER RANDOM LIBRARY" shall mean any chemical compound 
library prepared by or on behalf of Pharmacopeia containing compounds based 
on structures selected by Pharmacopeia, solely or with the guidance of the 
RSC, pursuant to the Random Library Agreement.

           1.20.2  "FOCUSED LIBRARY" shall mean any library prepared by 
Pharmacopeia specifically for screening in the Research Program based on (i) 
structures with activity against the Designated Target disclosed by Bayer to 
Pharmacopeia pursuant to Section 2.1(b) or Section 2.2.2(c) below, (ii) 
proprietary structure-activity relationship information relating to the 
structures in (i) above, supplied by Bayer to Pharmacopeia, or (iii) 
proprietary information of Pharmacopeia based on (i) or (ii) above.

     1.21  "LIBRARY COMPOUND" shall mean any compound which is or was 
contained in a Library prepared and screened by Pharmacopeia in connection 
with the Research Program.

     1.22  "LICENSED TECHNOLOGY" shall mean Existing Patent Rights, Future 
Patent Rights, Existing Know-How and Future Know-How. It is understood that 
the Licensed Technology shall not include the Excluded Technology.

           1.22.1  "EXISTING PATENT RIGHTS" shall mean (i) all patents and 
patent applications existing as of the Effective Date that claim any 
Designated Compound or method of use or process for the synthesis thereof or 
composition-of-matter thereof, and (ii) any divisions, continuations, 
continuations-in-part, reissues, reexaminations, extensions or other 
governmental actions which extend any of the subject matter of a patent in 
subsection (i) above, and any substitutions, confirmations, registrations, 
revalidations, or additions of any of the foregoing, in each case, which is 
owned or controlled, in whole or part, by license, assignment or otherwise by 
Pharmacopeia during the term of this Agreement, and subject to any 
limitations and prohibitions of such license or sublicense.

                                       -5-

<PAGE>

     1.22.2  "FUTURE PATENT RIGHTS" shall mean (i) all patents and patent 
applications claiming a Designated Compound or method of use or process for 
the synthesis thereof or composition-of-matter thereof conceived by 
Pharmacopeia during the term of the Research Program or jointly with Bayer 
and/or its Affiliates or Sublicensees during the term of the Research 
Program, (ii) all patents and patent applications claiming a Derivative 
Compound or method of use or process for the synthesis thereof or 
composition-of-matter thereof conceived by Pharmacopeia during the term of 
the Research Program or jointly with Bayer and/or its Affiliates or 
Sublicensees during the term of the Research Program, and (iii) any 
divisions, continuations, continuations-in-part, reissues, reexaminations, 
extensions or other governmental actions which extend any of the subject 
matter of a patent, and any substitutions, confirmations, registrations, 
revalidations, or additions of any of the foregoing, in each case, which is 
owned or  controlled, in whole or in part, by license, assignment or 
otherwise by Pharmacopeia during the term of this Agreement.

     1.22.3  "EXISTING KNOW-HOW" shall mean all ideas, inventions, data, 
know-how, instructions, processes, formulas, expert opinion and information, 
including, without limitation, biological, chemical, pharmacological, 
toxicological, pharmaceutical, physical and analytical, clinical, safety, 
manufacturing and quality control data and information, existing as of the 
Effective Date owned or controlled in whole or in part by Pharmacopeia by 
license, assignment or otherwise, in each case, which is necessary for  the 
development, manufacture, use, sale or commercialization of Agreement 
Compounds and Agreement Products, in each case, to the extent Pharmacopeia 
has the right to license or sublicense the same, and subject to any 
limitations or prohibitions of any license or sublicense. Excluded from 
Existing Know-How are any inventions otherwise included in the definition of 
any Existing Patent Rights in this Agreement.

     1.22.4  "FUTURE KNOW-HOW" shall mean all ideas, inventions, data, 
know-how, instructions, processes, formulas, expert opinion and information, 
including, without limitation, biological, chemical, pharmacological, 
toxicological, pharmaceutical, physical and analytical, clinical, safety, 
manufacturing and quality control data and information, owned or controlled by 
Pharmacopeia in whole or in part by license, assignment or otherwise or 
jointly with Bayer and/or its Affiliates during the term of the Research 
Program, in each case, which is necessary for the development, manufacture, 
use or sale or commercialization of Agreement Compounds and Agreement Products. 
Excluded from Future Know-How are any inventions otherwise included in the 
definition of any Future Patent Rights in this Agreement.

     1.23  "MAJOR COUNTRY" shall mean any of the United States, Canada, 
Japan, the United Kingdom, France, Germany, Italy or Spain.

     1.24  "NDA" shall mean a New Drug Application, as defined in the U.S. 
Food, Drug and Cosmetic Act and the regulations promulgated thereunder, or 
any corresponding foreign application, registration or certification.

                                       -6-

<PAGE>

     1.25  "NET SALES" shall mean the invoice price of Agreement Products 
sold by Bayer or its Affiliates or Sublicensees to third parties, less, to 
the extent included in such invoice price the total of: (1) ordinary and 
customary trade discounts actually allowed; (2) credits, rebates and returns 
(including, but not limited to, wholesaler and retailer returns); (3) 
freight, postage, insurance and duties paid for and separately identified on 
the invoice or other documentation maintained in the ordinary course of 
business, and (4) excise taxes, other consumption taxes, customs duties and 
compulsory payments to governmental authorities actually paid and separately 
identified on the invoice or other documentation maintained in the ordinary 
course of business. Net Sales shall also include the amount or fair market 
value of all other consideration received by Bayer or its Affiliates or 
Sublicensees in respect of Agreement Products, whether such consideration is 
in cash, payment in kind, exchange or another form. In the case of pharmacy 
incentive programs, hospital performance incentive program charge backs, 
similar programs or discounts on "bundles" of products, Bayer may with notice 
to Pharmacopeia discount the bona fide list price of an Agreement Product by 
the average percentage discount of all Bayer products in a particular 
"bundle", calculated as follows:

              Average percentage             A          
              discount on a         =  -------------  X 100
              particular "bundle"            B

where A equals the total discounted price of a particular "bundle" of 
products, and B equals the sum of the undiscounted bona fide list prices of 
each unit of every product in such "bundle". Bayer shall provide Pharmacopeia 
documentation, reasonably acceptable to  Pharmacopeia, establishing such 
average discount with respect to each "bundle". If an Agreement Product is 
not sold separately and no bona fide list price exists for such Agreement 
Product, the parties shall negotiate in good faith an imputed bona fide list 
for such Agreement Product.

     1.26  "NOTICE DATE" shall have the meaning set forth in Section 1.15.1 
of this Agreement.

     1.27  "OTHER COMPOUND" shall mean any Library Compound in a Focused 
Library screened by or on behalf of Bayer pursuant to Section 4.3.1 which 
demonstrates activity outside the Designated Field that Bayer has designated 
pursuant to Section 4.4. It is understood that Other Compounds shall not 
include compound(s) which also have activity within the Designated Field.

     1.28  "PHASE I", "PHASE II", and "PHASE III" shall mean Phase I (or 
Phase I/II), Phase II (or Phase II/III), and Phase III clinical trials, 
respectively, in each case as prescribed  by applicable FDA IND Regulations, 
or any corresponding foreign statutes, rules or regulations.

                                       -7-

<PAGE>

     1.29  "RANDOM LIBRARY AGREEMENT" means that certain Random Library 
Agreement entered into by the parties on even date herewith.

     1.30  "RESEARCH PLAN" shall have the meaning set forth in Section 2.3.

     1.31  "RESEARCH PROGRAM" shall include the activities and items set 
forth in Sections 2.2.1 and 2.2.2 of this Agreement.

     1.32  "RESEARCH STEERING COMMITTEE" or "RSC" shall have the meaning set 
forth in section 3.1 below.

     1.33  "SUBLICENSEE" shall mean with respect to a particular Agreement 
Compound or Agreement Product, a third party to whom Bayer has granted a 
sublicense or other right under the related Licensed Technology to make, have 
made, import, have imported, use and have used an Agreement Compound, or to 
make, have made, use, have used, import, have imported, offer for sale, have 
sold and/or sell an Agreement Product. As used in this Agreement, it is 
understood that "Sublicensee" shall also include (i) any third party to whom 
Bayer or a Bayer Affiliate has granted the right to distribute an Agreement 
Product, provided that such third party has the primary responsibility for 
marketing and promotion at its expense of such Agreement Products within the 
field or territory for which such distribution rights are granted, which 
marketing and promotional activities are not subsidized by Bayer, or (ii) any 
third party which uses or sells any Agreement Product under any direct or 
indirect grant of rights or authorization by Bayer or a Bayer Affiliate to 
have used or have sold such Agreement Product.

                                    ARTICLE 2                                 
                                RESEARCH PROGRAM

     2.1  SELECTION OF DESIGNATED TARGET.  The molecular target(s) which will 
be the subject of the Research Program shall be agreed upon by the parties in 
accordance with the following procedures:

          (a)  PROPOSED MOLECULAR TARGET.  Bayer shall have the right to 
propose with notice to Pharmacopeia on or before July 1, 1996, a specific 
molecular target for study in the Research Program, and Pharmacopeia shall 
notify Bayer within seven (7) days of Pharmacopeia's receipt of such notice 
whether such target may be pursued in the Research Program without a conflict 
with or breach of Pharmacopeia's existing agreements with third parties.

          (b)  BAYER INFORMATION.  After receipt of a notice from 
Pharmacopeia indicating that the proposed target may be pursued in the 
Research Program, Bayer shall disclose to Pharmacopeia the structures of any 
proprietary Bayer compounds known to have activity against such molecular 
target, and any available structure-activity data

                                       -8-

<PAGE>

relating thereto, a description of the assays Bayer wishes to have 
Pharmacopeia conduct in connection with the Research Program, and other 
relevant information (e.g., any reagents which Bayer will provide 
Pharmacopeia in connection with the Research Program and the like), and such 
further information as Pharmacopeia may reasonably request from Bayer with 
regard to the activities Bayer would like Pharmacopeia to conduct in the 
Research Program.

          (c)  NOTICE FROM PHARMACOPEIA.  Within twenty-one (21) days of 
receipt of all such information, Pharmacopeia shall notify Bayer whether (i) 
Pharmacopeia believes it is feasible to perform the Research Program with 
respect to the structures and molecular target proposed by Bayer, (ii) the 
number of Pharmacopeia full-time equivalent ("FTE") research positions 
necessary for the conduct of a Research Program with respect to the proposed 
molecular target, and (iii) if Pharmacopeia wishes to pursue such proposed 
target in the Research Program.

          (d)  AGREED TERMS.  In the event that Pharmacopeia provides notice 
that it is willing to pursue the structures and molecular target proposed by 
Bayer, such target shall be deemed a "Designated Target," and the parties 
shall promptly meet to (i) agree on the number of FTE research positions for 
the Research Program, which number shall not be less than an average of 
[ * * * ]  FTE's unless otherwise agreed by the parties, (ii) define the 
Designated Field for such Designated Target, and (iii) define criteria for 
the specificity and potency of a Designated Compound, and agree on whether an 
appropriate IN VIVO model exists for the Designated Target.

          (e)  RESEARCH PLAN.  After the parties agree on each of the items 
set forth in subsection (d) above, the parties shall promptly discuss and 
agree on a written Research Plan for the conduct of the Research Program.

     2.2  RESEARCH PROGRAM ACTIVITIES.  Subject to the terms and conditions 
set forth herein, the parties shall conduct research under the Research Plan 
with respect to Agreement Compounds on a collaborative basis with the goal of 
identifying Lead Compounds that may be developed into Agreement Products. 
Each party shall use its diligent efforts to conduct the Research Program in 
accordance with the Research Plan, within the time schedules contemplated 
therein, with a view towards identifying Lead Compounds in a timely fashion. 
Diligent efforts for Bayer shall be those efforts it would use for similar 
research work for its own compounds of similar value and status.

          2.2.1  PHARMACOPEIA RESPONSIBILITIES.

                 (a)  REASONABLE EFFORTS.  Pharmacopeia shall use reasonable 
efforts to perform the Research Program with the goal of optimizing 
opportunities to identify Lead Compounds by generating Focused Libraries and 
screening such Libraries in view of the Pharmacopeia personnel resources to 
be devoted to the Research Program in accordance with the Research Plan;

[ * * *  Confidential Treatment Requested. ]

                                       -9-

<PAGE>

                 (b)  DISCLOSURES.  During the term of the Research Program, 
Pharmacopeia shall keep the RSC fully informed of its activities in the 
Designated Field including, without limitation, by providing the RSC with 
data and information regarding Agreement Compounds, and structures thereof, 
and biological assays developed  by Pharmacopeia relating to the Designated 
Field;

                 (c)  STAFFING.  During the Initial Term, Pharmacopeia will 
provide an average of  [ * * * ]  full-time equivalent ("FTE") research 
positions to conduct the Research Program, or such greater number of FTE 
positions as may be agreed pursuant to Section 2.1(d) above or Sections 2.4.2 
or 2.5.2 below; and

                 (d)  THIRD PARTY LICENSES.  Subject to Section 2.5.4(b), 
Pharmacopeia may acquire licenses to the intellectual property or technology 
of third parties necessary for the performance of the Research Program.

          2.2.2  BAYER RESPONSIBILITIES.

                 (a)  REASONABLE EFFORTS.  Bayer shall use reasonable efforts 
to provide Pharmacopeia with support and assistance in the conduct of the 
Research Program;

                 (b)  DISCLOSURES.  During the term of the Research Program, 
Bayer shall keep the RSC informed of its activities in the Designated Field, 
except with respect to Excluded Products, including, without limitation, by 
providing the RSC with data and information regarding Agreement Compounds, 
and structures thereof, and assays relating to the Designated Target 
developed and used by Bayer; provided, Bayer need not disclose to 
Pharmacopeia information or data which does not directly relate to the goals 
of the Research Program; and

                 (c)  BAYER STRUCTURES.  Bayer may disclose to Pharmacopeia 
structures proprietary to Bayer, which Bayer synthesized and demonstrated to 
have activity in the Designated Field, as shown by contemporaneous 
documentation, and proprietary structure-activity relationship data relating 
thereto, which the RSC may use to design Libraries for screening in 
connection with the Research Program.

     2.3  RESEARCH PLAN.  The parties shall adopt a written overall plan for 
the research the parties will conduct in the Designated Field (the "Research 
Plan") pursuant to Section 2.1(d) above. The RSC shall review the Research 
Plan on an ongoing basis and may make changes to the Research Plan; provided, 
however, the Research Plan shall not be modified except as mutually agreed by 
Pharmacopeia and Bayer.

     2.4  EXTENSION OF RESEARCH PROGRAM TERM.

          2.4.1  OPTION TO EXTEND.  Bayer shall have the right to extend the 
term of the Research Program  [ * * * ]  beyond the Initial Term. To

[ * * *  Confidential Treatment Requested. ]

                                      -10-

<PAGE>

extend the Research Program beyond the Initial Term, Bayer must notify 
Pharmacopeia no later than six (6) months prior to the second anniversary of 
the commencement of the Initial Term, and if Bayer so notifies Pharmacopeia, 
the parties shall negotiate the terms of any such extension in good faith.

          2.4.2  EXTENSION TERMS.  During the  [ * * * ]  term of the 
Research Program (if any), Pharmacopeia will provide a minimum of  [ * * * ]  
full-time equivalent research positions. Notwithstanding the foregoing, if 
during the year immediately preceding the applicable extension, the Research 
Program was operating in a broadened scope pursuant to the operation of 
Section 2.5.2, at the request of Bayer, Pharmacopeia will provide up to  
[ * * * ]  additional FTE research positions, over and above the  [ * * * ]  
average FTE research positions described above. Bayer shall pay Pharmacopeia 
for each FTE position, calculated as follows:  [ * * * ]  ($[ * * * ]  per 
FTE multiplied by the aggregate increase in the CPI in the period from the 
Effective Date until the date on which each extension term of the Research 
Program commences.

     2.5  OPTIONS TO SUBSTITUTE FIELD OR EXPAND EXISTING RESEARCH PROGRAM.

          2.5.1  OPTION TO SUBSTITUTE FIELD.  After the first anniversary of 
the commencement of the Initial Term, or earlier with the consent of the RSC, 
Bayer shall have the option of discontinuing the activities of the Research 
Program with respect to the initial Designated Field, and redirecting the 
Research Program towards another mutually agreed molecular target.

                 (a)  EXERCISE OF OPTION.  To exercise such option, Bayer 
shall provide Pharmacopeia with three (3) months written notice (i) that 
Bayer desires to drop the initial Designated Field from the Research Program, 
and (ii) of the identity of the new field Bayer wishes to pursue. The RSC 
shall promptly meet thereafter to revise the annual Research Plan then in 
effect and develop plans for pursuing any such alternative target.

                 (b)  AGREEMENT AMENDMENTS.  The RSC also shall agree on 
definition of the substitute Designated Field as necessary to establish that 
compounds with activity to a particular molecular target, and products based 
thereon, shall be Agreement Compounds and Agreement Products, respectively, 
for all purposes of this Agreement. The definition of the new field shall be 
commensurate with the scope of the definition for Designated Field and the 
parties shall agree on the terms and conditions defining Libraries to be 
prepared for such field, and the financial terms relating to such Libraries 
and their use. Compounds and products with activity in the new Designated 
Field shall be subject to all applicable Agreement provisions which apply 
with respect to Agreement Compounds and Agreement Products and related 
Libraries in the initial Designated Field MUTATIS MUTANDI. In each case, any 
necessary conforming Agreement amendment shall be promptly completed and 
executed by the parties.

[ * * *  Confidential Treatment Requested. ]
                                      -11-

<PAGE>

                 (c)  CONTINUED OBLIGATIONS.  In the event that Bayer drops a 
Designated Field from the Research Program because of the successful 
identification of a Designated Compound and directly or indirectly continues 
the development or commercialization of Agreement Compounds or Agreement 
Products directed to such target, Bayer's rights and obligations hereunder 
shall remain in full force and effect, subject to the terms and conditions of 
the Agreement.

           2.5.2  OPTION TO EXPAND EXISTING RESEARCH PROGRAM.  During the 
Initial Term of the Research Program and the  [ * * * ]  extension thereof 
(if any) Bayer shall also have the right to  expand the scope of the Research 
Program with respect to the existing Research Program. To exercise such 
option, Bayer shall provide Pharmacopeia with three (3) months' written 
notice, and Pharmacopeia agrees to use diligent efforts to expand the 
Research Program as rapidly as practicable. Notwithstanding the above, 
Pharmacopeia will not be obligated to commit more than  [ * * * ]  additional 
annual full-time equivalent research positions in total.

          2.5.3  RESEARCH PLAN REVISIONS.  The RSC shall promptly meet after 
any substitution of a new field or expansion of the Research Program to 
revise the Research Plan with respect to the further Research Program 
activities, and the additional amounts which Bayer shall pay to Pharmacopeia 
for the conduct of such further activities in accordance with Section 2.5.4; 
provided, Bayer agrees to pay Pharmacopeia per annum, pro-rated amounts 
subject to Section 2.4.2 for each FTE research position added by Pharmacopeia 
pursuant to this Section 2.5.

          2.5.4  ADDITIONAL EXPENSES.

                 (a)  CAPITAL EXPENDITURES.  In the event that pursuing a
particular Designated Target in the Research Program will require Pharmacopeia
to incur unanticipated reasonable additional out-of-pocket expenses in
connection with the Research Program for facilities alterations or capital
expenditures on specialized equipment, the parties shall agree on the additional
monies which shall be paid to Pharmacopeia by Bayer therefor. In addition, Bayer
shall pay to Pharmacopeia all reasonable direct and indirect expenses incurred
by Pharmacopeia in connection with the hiring or reassignment of personnel with
respect to pursuing a substitute Designated Target pursuant to Section 2.5.1. It
is understood that Pharmacopeia will be the owner of all capital equipment
purchased by Pharmacopeia in connection with the Research Program, whether or
not separately identified in the Research Plan. It is further understood that
Bayer may loan Pharmacopeia, from time to time as the parties agree, certain
capital equipment to be used in the Research Program at Pharmacopeia's facility.

                 (b)  LICENSE COSTS.  In the event that it is necessary for
Pharmacopeia to acquire any third party license specifically for the conduct of
the Research Program in the Designated Field, prior to entering any such license
Pharmacopeia shall notify Bayer of Pharmacopeia's interest in acquiring such
license and the reason therefor.

[ * * *  Confidential Treatment Requested. ]

                                      -12-

<PAGE>

Within thirty (30) days of its receipt of such notice, Bayer shall notify
Pharmacopeia whether it wishes Pharmacopeia to acquire such a license. Bayer
shall pay to Pharmacopeia any amounts paid by Pharmacopeia pursuant to such
license(s) for which Bayer indicates it will be responsible; provided, in the
event such licenses are also used by Pharmacopeia in connection with other
collaborative programs, Bayer shall only be obligated to pay to Pharmacopeia its
pro rata share of such amounts, calculated based on the number of other
collaborative programs in which such intellectual property is used. Pharmacopeia
shall provide Bayer notice of such payment obligations and invoice Bayer for
such costs and Bayer shall pay the invoice within thirty (30) days. In the event
that Bayer declines to pay the costs associated with such a license,
Pharmacopeia shall have no obligation to acquire such a license, and shall have
no liability pursuant to this Agreement for not acquiring such a license or
declining to pursue any research in connection with the Research Program which
would utilize such third party intellectual property or technology.

     2.6  RECORDS; INSPECTION.

          (a)  RESEARCH PROGRAM.  Pharmacopeia and Bayer shall maintain
records of the Research Program (or cause such records to be maintained) in
sufficient detail and in good scientific manner as will properly reflect all
work done and results achieved in the performance of the Research Program
(including all data in the form required under any applicable governmental
regulations and as directed by the RSC). Each party shall allow the other to
have reasonable access to all pertinent materials and data generated by or on
behalf of such party with respect to each Agreement Compound in connection with
the Research Program, as set forth in the Research Plan. It is understood that
Pharmacopeia shall have no obligation to disclose to Bayer any Excluded
Technology. Subject  to Section 2.9, it is understood that Bayer shall have no
obligation to disclose to Pharmacopeia the structures of any pharmaceutically
active compounds in Excluded Products.

          (b)  RESEARCH PROGRAM EXPENDITURES.  Pharmacopeia shall keep
complete, true and accurate books of account and records of the amounts it
expends in connection with the performance of the Research Program. Such books
and records shall be kept at the principal place of business of Pharmacopeia for
at least three (3) years following the termination of the term of the Research
Program. Such records will be open for inspection during such three (3) year
period by a representative or agent of Bayer, at Bayer's expense, for the
purpose of verifying the amounts expended in connection with the Research
Program. Such inspections may be made no more than once each calendar year, at
reasonable times and on reasonable notice. The representative or agent of Bayer
shall sign a customary confidentiality agreement as a condition precedent to
such inspection and shall report to Bayer only whether any discrepancy has been
identified with respect to Research Program expenditures.

     2.7  DESIGNATED FIELD EXCLUSIVITY.  Until the earlier of (a)  [ * * * ]  
after the termination of the Research Program with respect to a particular 
Designated Target, if such termination occurs during the Initial Term, or (b) 
 [ * * * ]  after the end of the Research

[ * * *  Confidential Treatment Requested. ]

                                      -13-

<PAGE>

Program with respect to a particular Designated Target, Pharmacopeia will not
(i) knowingly make compounds or combinatorial libraries for or with any third
person or entity specifically for screening against such Designated Target, (ii)
perform contract screening for or with any third person or entity with respect
to such Designated Target, or (iii) perform for its own account any screening
with respect to such Designated Target. Bayer understands that in the ordinary
course of its business Pharmacopeia provides libraries to third parties for
screening against unidentified targets.

     2.8  POST-RESEARCH PROGRAM ACTIVITIES.  Except as expressly provided
otherwise under the terms of this Agreement, Bayer shall, at Bayer's or its
Affiliates' or Sublicensees' expense, be responsible for conducting all
development of Agreement Compounds and Agreement Products following the
completion of the Research Program, and all commercialization of Agreement
Products which Bayer retains rights to under this Agreement and develops and
commercializes.

     2.9  EXCLUDED PRODUCT.  Until  [ * * * ]  after the end of the Research 
Program, as it may be extended, within thirty (30) days of the successful 
completion of Phase II clinical trials with respect to an Excluded Product, 
Bayer shall notify Pharmacopeia of such event, and provide a description of 
why such Excluded Product is not an Agreement Product hereunder; provided, 
Bayer shall have no obligation to notify Pharmacopeia or provide a 
description of any Excluded Product which does not contain a small molecule 
compound. If a dispute arises between the parties which the parties are 
unable to resolve regarding whether or not a product is an Excluded Product, 
the dispute shall be settled by binding arbitration pursuant to Section 14.13 
herein. The arbitrators shall be independent persons with expertise in patent 
law and medicinal chemistry. Each party shall present a written statement of 
its position to the arbitrators and the other party, and the arbitrators 
shall evaluate such statements, and such other evidence as the arbitrators 
deem appropriate, and shall select the statement of one of the parties as 
their position; provided, however, Bayer shall be responsible for presenting 
evidence establishing that such product meets the criteria set forth in 
Section 1.13 above. In the event that the arbitrators determine that the 
Excluded Product that is the subject of the arbitration is an Agreement 
Product, then Bayer shall pay to Pharmacopeia liquidated damages equal to  
[ * * * ]  payments due Pharmacopeia pursuant to Section 6.2.1 which were not 
timely paid to Pharmacopeia (without any obligation to pay interest from the 
date such milestone payments originally should have been made), in addition 
to any other amounts due under the Agreement.

     2.10 TECHNOLOGY TRANSFER.  Subject to Section 5.7 below, to maximize the
success of the Research Program, Pharmacopeia and Bayer shall exchange agreed
information and materials relating to biology and screening technology and
solid-phase chemical synthesis; provided, Pharmacopeia shall have no obligation
to disclose to Bayer any materials or information relating to the Excluded
Technology.

[ * * *  Confidential Treatment Requested. ]

                                      -14-

<PAGE>

                                    ARTICLE 3
                                   MANAGEMENT

     3.1  RESEARCH STEERING COMMITTEE.  Bayer and Pharmacopeia will establish a
Research Steering Committee ("RSC") to oversee, review and coordinate the
conduct of the Research Program, and provide advice regarding prosecution of
patent applications within the Joint Inventions (as defined in Article 9
herein).

     3.2  MEMBERSHIP.  The RSC shall be comprised of an equal number of
representatives from each of Bayer and Pharmacopeia, each party's members
selected by that party. Bayer and Pharmacopeia shall each have four (4)
representatives on such Committee or such other number as the parties may agree.
The initial representatives of each party are listed on Exhibit A hereto.
Pharmacopeia and Bayer may replace its RSC representatives at any time, upon
written notice to the other party. The RSC shall be chaired as agreed by the
parties. From time to time, the RSC may establish subcommittees to oversee
particular projects or activities, and such subcommittees will be constituted as
the RSC agrees.

     3.3  RSC MEETINGS.  During the term of the Research Program, as it may be
extended, the RSC shall meet four (4) times per year at regular intervals, or
more often as agreed by the parties, at such locations as the parties agree. At
such meetings, the RSC will formulate and review the Research Program
objectives, monitor the progress of the Research Program toward those
objectives, and take such other actions as may be specified under this Agreement
or as the parties deem appropriate. With the consent of the parties, other
representatives of Pharmacopeia or Bayer or its Affiliates or Sublicensees may
attend RSC meetings as nonvoting observers. Each party shall be responsible for
all of its own expenses. The first meeting of the RSC shall occur as soon as
practicable after the Effective Date, but in no event later than forty-five (45)
days after the commencement of the Initial Term.

     3.4  DECISION MAKING.  Pharmacopeia and Bayer shall each be entitled to
cast one vote on matters before the RSC. Decisions of the RSC shall be made by
unanimous approval. In the event that unanimity is not achieved within the RSC,
the dispute will be referred to Pharmacopeia's President (or designee of similar
rank) and Bayer's Vice President for Research (or designee of similar rank), who
shall promptly meet and endeavor to resolve the dispute in a timely manner.

     3.5  BAYER RANDOM LIBRARY DESIGN.  In addition to its responsibilities with
respect to the Research Program, the RSC shall be responsible for the selection
and aiding in the design of the Bayer Random Libraries to be provided to Bayer
for screening pursuant to Section 2.1 of the Random Library Agreement.

                                      -15-

<PAGE>

                                    ARTICLE 4
                                    LIBRARIES

     4.1  EXCLUSIVITY PERIODS.

          4.1.1  BAYER RANDOM LIBRARIES.

                 (a)  During the applicable Exclusivity Period, Pharmacopeia 
shall not with respect to any of the Library Compounds described in Section 
1.15.1, use itself (except pursuant to Sections 4.2.2 or 5.5) for screening 
against any target, or knowingly provide any such compounds to any third 
person or entity, except as approved by Bayer in writing.

                 (b)  It is understood that after the Exclusivity Period of a 
Bayer Random Library, as such period may be extended, Pharmacopeia and Bayer 
may each subsequently use Bayer Random Library, and Pharmacopeia may provide 
such Bayer Random Library to others, subject to the terms and conditions set 
forth in the Random Library Agreement. It is understood that either 
Pharmacopeia or Bayer may seek patent rights on its sole behalf with respect 
to any such Library Compound which such party determines has patentable 
utility, provided that such Library Compound (i) is not a Designated Compound 
or an Active Compound and is not within the scope of a patent application or 
patent within the Licensed Technology or Bayer Technology, or (ii) is an 
Active Compound with respect to which Bayer has not met the diligence 
requirements set forth in Section 6.1 of the Random Library Agreement, and 
has not retained rights pursuant to Section 6.2 of the Random Library 
Agreement.

     4.1.2  FOCUSED LIBRARIES.  During the applicable Exclusivity Period set
forth in Section 1.15.3, Pharmacopeia shall not with respect to any of the
Library Compounds contained in a Focused Library provide any such Library
Compounds, to any third person or entity for any purpose, or itself make or use
such Library Compounds or Designated Compounds developed therefrom, as the case
may be, except in connection with the Research Program or as permitted under
Sections 5.5 and 5.6, or as otherwise approved by Bayer in writing.

     4.2  PHARMACOPEIA SCREENING.

          4.2.1  FOCUSED LIBRARIES.  During the term of the Research Program,
Pharmacopeia shall screen Focused Libraries for activity in the Designated
Field. Any compound  identified as having activity against the Designated Target
as a result of such activities shall be considered a Designated Compound for all
purposes of this Agreement.

          4.2.2  BAYER RANDOM LIBRARIES.  During the term of the Research
Program, Bayer shall notify Pharmacopeia whether it wishes Pharmacopeia to
screen any Bayer Random Library in connection with the Research Program.
Pharmacopeia shall not screen

                                      -16-

<PAGE>

any Bayer Random Library in connection with the Research Program without the
prior written consent of Bayer. Bayer understands and agrees that in the event
that Pharmacopeia identifies a Designated Compound from a Bayer Random Library,
such compound shall be subject to the terms and conditions of this Agreement,
including without limitation, the provisions of Section 6.2.1(a) and 6.3.1.

     4.3  BAYER SCREENING.

          4.3.1  FOCUSED LIBRARIES.

                 (a)  During the term of the Research Program, with notice to 
Pharmacopeia, Bayer may request Pharmacopeia to provide Bayer with a copy of 
any Focused Library and, if technically compatible with the 96-well 
microtiter plate format, as reasonably determined by Pharmacopeia, 
Pharmacopeia shall use diligent efforts to provide to Bayer such Focused 
Library within  [ * * * ]  of Bayer's written request. Bayer may screen any 
such Focused Library outside the Designated Field.

                 (b)  Bayer shall pay Pharmacopeia  [ * * * ]  dollars 
($[ * * * ]) for each set of plates for such Focused Library (i.e., two 
copies suitable for one additional assay). Pharmacopeia shall invoice Bayer 
for such costs, and Bayer shall pay such invoice within thirty (30) days of 
receipt. At Bayer's request,  [ * * * ]  for each set of plates Pharmacopeia 
shall rearray up to  [ * * * ]  wells in such set of plates, decode up to  
[ * * * ]  active structures that demonstrate activity against a target other 
than a Designated Target, and resynthesize up to  [ * * * ]  of  [ * * * ]  
in such Focused Library. In the event that Bayer requests further decodes or 
rearrays, Pharmacopeia agrees to perform such tasks at a cost of  [ * * * ]  
per additional rearray and  [ * * * ]  per additional structure decoded. 
Pharmacopeia shall invoice Bayer for any such costs, and Bayer shall pay such 
invoice within thirty (30) days of receipt.

                 (c)  In the event Bayer identifies an Other Compound in such 
a Library, and develops and commercializes an Agreement Compound which is an 
Other Compound or a Derivative Compound thereof, Bayer shall pay to 
Pharmacopeia milestone payments and royalties with respect thereto, pursuant 
to Sections 6.2.1(b) and 6.3.1.

          4.3.2  BAYER RANDOM LIBRARIES.  It is understood and agreed that if
Bayer or its Affiliates of Sublicensees screens any Bayer Random Library
provided to Bayer pursuant to the Random Library Agreement in the existing
Designated Field, and identifies a compound with activity in such  Designated
Field, such compound shall be treated as a Library Compound and a Designated
Compound subject to this Agreement for all purposes, and shall be subject to the
terms and conditions herein, including, without limitation, Sections 6.2.1(a)
and 6.3.1.

     4.4  RIGHT TO DESIGNATE OTHER COMPOUNDS.  Except with regard to Excluded
Products, it is understood that Bayer or its Affiliates or Sublicensees may not
develop or

[ * * *  Confidential Treatment Requested. ]

                                      -17-

<PAGE>

commercialize any Library Compound, or any Derivative Compound developed from a
Library Compound, which has activity outside the Designated Field, unless such
Library Compound has been designated as an Other Compound. Bayer shall have  the
right to designate any Library Compound in a Focused Library as an Other
Compound as follows:

          4.4.1  DECODING BY PHARMACOPEIA.  At such time as Pharmacopeia has
identified to Bayer the structure of a Library Compound with activity in a
particular biological assay outside the Designated Field following a request for
decoding of such Library Compound by Bayer, that compound shall automatically be
designated an Other Compound.

          4.4.2  IDENTIFICATION BY BAYER.  In the event that Bayer or its
Affiliates or Sublicensees identifies, without decoding by Pharmacopeia pursuant
to Section 4.4.1 above, a particular Library Compound with activity in a
particular biological assay outside the Designated Field, Bayer shall give
Pharmacopeia notice identifying such Library Compound and indicating that the
Library Compound has activity outside the Designated Field. Such Library
Compound shall be designated an Other Compound as of the date of Pharmacopeia's
receipt of such notice.

     4.5  RETAINED RIGHTS.  Pharmacopeia shall retain ownership of the tangible
property embodied in all physical Libraries subject to this Agreement and the
Library Compounds therein. It is understood that Bayer shall have certain
license and patent rights with respect to such Library Compounds under this
Agreement.

                                    ARTICLE 5
                                    LICENSES

     5.1  LICENSE TO BAYER.  Subject to the terms and conditions of this
Agreement, Pharmacopeia agrees to grant, and hereby grants, to Bayer and its
Affiliates a worldwide, exclusive license under the applicable Licensed
Technology to make, have made, import, have imported, use and have used
Agreement Compounds, and make, have made, import, have imported, use, have used,
offer for sale, have sold and sell Agreement Products based on Designated
Compounds or Derivative Compounds thereof in the Designated Field, and based on
Other Compounds or Derivative Compounds thereof outside the Designated Field. It
is understood that such licenses shall include the right to discover and develop
Agreement Compounds and Agreement Products and to conduct drug research in the
Designated Field after the term of the Research Program during the term of this
Agreement.

     5.2  SUBLICENSES.  Subject to the terms and conditions of this Agreement,
Bayer (but not its Affiliates) shall have the right to sublicense the rights
granted in Section 5.1 above; provided, Bayer shall not transfer any Bayer
Random Library or Focused Library to any third party.  Each sublicense granted
by Bayer shall be consistent with all the terms and conditions of this Agreement
and the Columbia License, and subordinate thereto, and Bayer,

                                      -18-

<PAGE>

shall remain responsible to Pharmacopeia for the compliance of each such
Sublicensee with the financial and other obligations due under this Agreement.
Such Sublicensees shall not have the right to grant further sublicenses, or
grant third parties the right to have used or have sold the Agreement Compounds
or Agreement Products, and such sublicenses may not be assigned or transferred
to any third party without the prior written consent of Pharmacopeia. Promptly
following the execution of any sublicense, Bayer shall notify Pharmacopeia of
the existence and identity of each Sublicensee.

     5.3  THIRD PARTY RIGHTS.

          5.3.1  OVERLAPPING RIGHTS.  It is understood that Pharmacopeia is in
the business of providing combinatorial libraries to third parties, and that
Pharmacopeia will grant such third parties rights after the Effective Date to
acquire licenses for compounds derived from such libraries similar to Bayer's
rights under this Article 5. Notwithstanding the licenses granted above, it is
possible that a third party may acquire rights from Pharmacopeia with respect to
one or more compounds of which Pharmacopeia is a sole or joint owner;
accordingly, Pharmacopeia's grant of rights in this Article 5 is limited to the
extent that (i) a third party (either alone or jointly with Pharmacopeia) has
filed a patent application with respect to such a compound prior to the filing
by Bayer (either alone or jointly with Pharmacopeia) of a patent application
with respect to such a compound, or (ii) Pharmacopeia has previously granted a
third party a license or other rights with respect to such a compound, and
subject to any such grant of rights to a third party.

          5.3.2  NO LIABILITY.  It is understood and agreed that even if 
Pharmacopeia complies with its obligations under this Agreement, that 
compounds provided to third parties in the course of Pharmacopeia's other 
business activities may result in third party patent applications and 
patents, including patent applications and patents owned by such third 
parties, or owned jointly by Pharmacopeia and such third parties, which could 
conflict with patent applications and patents owned by Bayer, or jointly 
owned by Bayer and Pharmacopeia hereunder. Pharmacopeia will use its 
reasonable efforts to avoid such conflict; provided, that unless Bayer is 
damaged as a proximate result of a material breach by Pharmacopeia of the 
terms of Article 4 or any of the representations and warranties in Article 
11, then Pharmacopeia shall have no liability under this Agreement with 
respect to any such conflict.

     5.4  COLUMBIA SUBLICENSE.  Subject to the terms and conditions of this
Agreement and the Columbia License, if necessary, Pharmacopeia will grant to
Bayer and its Affiliates and directly to Bayer's Sublicensees a nonexclusive,
worldwide sublicense, without the right to sublicense, under the Columbia
License, to make, have made, import, have imported, use and have used Agreement
Compounds, and make, have made, import, have imported, use, have used, offer for
sale, have sold and sell Agreement Products (i) based on Designated Compounds or
Derivative Compounds thereof, in the Designated Field, and (ii) based on Other
Compounds or Derivative Compounds thereof, outside the Designated Field. It is
understood and agreed that such sublicenses do not include the right to create,
make or have

                                      -19-

<PAGE>

made encoded combinational libraries, tags, markers or other encoding
compositions, or use methods or processes relating to encoded combinatorial
libraries, tags, markers, or other encoding compositions, or except as expressly
provided in this Agreement. In the event the Columbia License is terminated,
Bayer may become a licensee under the Columbia License, to the extent and by the
procedure provided for in the Columbia License.

     5.5  RESEARCH LICENSE.  Notwithstanding Section 5.1 above, Pharmacopeia
shall retain the right under the Licensed Technology to make, have made and use
Library Compounds for it own research purposes (i.e., to develop, improve and
validate its technology and intellectual property). Pharmacopeia agrees not to
conduct research or have research conducted on its behalf pursuant to this
Section which would adversely affect Bayer's ability to commercialize Agreement
Compounds or which would jeopardize the commercial or research value of the
Bayer Technology.

     5.6  PHARMACOPEIA RESEARCH PROGRAM.  Pharmacopeia shall have the
nonexclusive right to use during the Research Program intellectual property of
Bayer, such as reagents, as reasonably necessary to assay compounds in Libraries
for activity in the Designated Field. Bayer shall be responsible for the payment
of all amounts due third parties for Pharmacopeia's use of such intellectual
property in connection with the Research Program. As a condition precedent to
such use Pharmacopeia will execute any consents or sublicenses required by any
Bayer licensor; provided, Pharmacopeia shall not be required to execute any
unreasonable consents or licenses and will not be in breach of this Agreement
for failure to do so.

     5.7  TECHNOLOGY TRANSFER LICENSE.  Each party hereby grants to the other a
worldwide, non-exclusive, royalty-free license, with the right to grant
sublicenses, to use for all purposes all information and materials transferred
to the other pursuant to Section 2.10 above which is necessary for the conduct
of the Research Program.

     5.8  NO PRODUCTS OTHER THAN AGREEMENT PRODUCTS.  Except as otherwise agreed
or specifically provided in the terms of this Agreement, neither Bayer nor its
Affiliates nor Sublicensees shall commercialize any Library Compound or
Agreement Compound, other than as an Agreement Product in accordance with this
Agreement.

     5.9  BAYER AFFILIATES.  Attached hereto as Exhibit B is a complete list of
Bayer's Affiliates which shall have the right to practice the license rights
granted in Section 5.1 above. Bayer Affiliates not listed on Exhibit B, as may
be amended from time to time, shall not have the right to practice such
licenses. During the term of the Agreement, Bayer may amend Exhibit B with
notice to Pharmacopeia.

                                      -20-

<PAGE>

                                    ARTICLE 6
                                    PAYMENTS

     6.1  COLLABORATION FUNDING.

          6.1.1  RESEARCH PROGRAM FUNDING.  Bayer agrees to pay to Pharmacopeia
research funding with respect to the Research Program, in the following amounts:

               PERIOD            AMOUNT
               ------            ------
               Year 1         $2.75 Million
               Year 2         $2.75 Million

The above amounts are based on an average of  [ * * * ]  Pharmacopeia FTEs 
per year. In the event that the parties agree, pursuant to Section 2.1(d) 
above, that the Research Program requires more than  [ * * * ]  Pharmacopeia 
FTEs, the above amounts will be increased by  [ * * * ]  per FTE per year. If 
a substitute Designated Field has been added to the Research Program pursuant 
to Section 2.5.1, or the Research Program is expanded pursuant to 
Section 2.5.2, Bayer shall pay to Pharmacopeia the additional amounts 
specified in Section 2.5, when due. If the Research Program is extended 
pursuant to Section 2.4, Bayer shall pay to Pharmacopeia Research funding to 
be agreed by the parties for such additional period.

          6.1.2  ANNUAL PAYMENTS.   The amounts to be paid under Sections 
2.4, 2.5, and 6.1.1 above with respect to each twelve (12) month period 
shall be paid annually, and shall not be creditable against any other amounts 
due under this Agreement. The funding for the first year of the Research 
Program shall be paid to Pharmacopeia within thirty (30) days after the first 
day of the Initial Term. Subsequent annual payments shall be made on or 
before the applicable yearly anniversary of the Initial Term. All such 
payments shall be non-refundable.

          6.1.3  RECORDS; INSPECTION.  Pharmacopeia shall keep complete, true 
and accurate books of account and records for the purpose of determining the 
allocation of research funding under Section 6.1.1 payable under this 
Agreement. Such books and records shall be kept at the principal place of 
business of such party, as the case may be, for at least three (3) years 
following the end of the calendar quarter to which they pertain. Such records 
will be open for inspection during such three (3) year period by a public 
accounting firm to whom Pharmacopeia has no reasonable objection, solely for 
the purpose of verifying research funding expenditures hereunder. Such 
inspections may be made no more than once each calendar year, at reasonable 
times and on reasonable notice. Inspections conducted under this Section 
6.1.3 shall be at the expense of Bayer, solely for the purpose of verifying 
the accuracy of the expenditures. The public accounting firm employees shall 
sign a customary confidentiality agreement as a condition precedent to their 
inspection, and shall report to

[ * * *  Confidential Treatment Requested. ]

                                      -21-

<PAGE>

Bayer only that information which would be contained in a properly prepared
research funding expenditure report by Pharmacopeia.

     6.2  MILESTONE PAYMENTS.

          6.2.1  AGREEMENT PRODUCTS.

                 (a)  ACTIVE IN THE DESIGNATED FIELD.  Subject to Sections 
6.2.2 and 6.2.3 below, Bayer agrees to pay to Pharmacopeia the following 
amounts upon completion by Bayer or its Affiliates, Sublicensees or other 
designees of each achievement of each of the following milestones with 
respect to Agreement Compounds which are Designated Compounds or Derivative 
Compounds thereof (including Agreement Products), but not with respect to 
Excluded Products. Bayer shall have no obligation to pay any of the following 
milestone payments more than one (1) time with respect to Agreement Compounds 
or Agreement Products with activity against a particular molecular target in 
the Designated Field, regardless of how many applicable Agreement Products 
are commercialized:

               Milestones                                            Amount
          -------------------------                                  ------
     Identification of a Lead Compound                               $

     Nomination of a Development Candidate                           $
                                                                         *
     Filing of an IND or initiation of human trials in any country   $   
                                                                         *
     Initiation of Phase III clinical trials in any country          $   
                                                                         *
     Filing of NDA or foreign equivalent in any Major Country        $

     First approval of an NDA or foreign equivalent in any
     Major Country                                                   $

                                                      Total          $


                 (b)  ACTIVE OUTSIDE THE DESIGNATED FIELD.  Subject to 
Section 6.2.3 below, Bayer agrees to pay to Pharmacopeia the following 
amounts upon achievement by Bayer or its Affiliates, Sublicensees or other 
designees of each of the following milestones with respect to Agreement 
Compounds which are Other Compounds or

[ * * *  Confidential Treatment Requested. ]

                                      -22-

<PAGE>

Derivative Compounds thereof (including Agreement Products), but not with
respect to Excluded Products, as follows:

               Milestones                                            Amount
          -------------------------                                  ------
     Identification of a Lead Compound                               $

     Nomination of a Development Candidate                           
                                                                         *
     Filing of an IND or initiation of human trials in any country   $
                                                                         *
     Initiation of Phase III clinical trials in any country          $
                                                                         *
     Filing of NDA or NDA equivalent in any Major Country            $

     First approval of an NDA or NDA equivalent in any Major
     Country                                                         $

                                                      Total          $


          6.2.2  REDUCED MILESTONE PAYMENTS.  Notwithstanding Section 6.2.1 
above, in the event that a Derivative Compound with activity in the 
Designated Field which Bayer elects to develop (i) is conceived later than  
[ * * * ]  years after the end of the Research Program, as it may be 
extended, but before  [ * * * ]  years following the end of the Research 
Program, as it may be extended, as shown by contemporaneous written evidence, 
and (ii) is not (a) within the scope of a patent within the Licensed 
Technology, Joint Inventions or Bayer Technology issued as of the Cutoff 
Date, or (b) within the scope of a patent within the Licensed Technology, 
Joint Inventions or Bayer Technology issued from a patent application pending 
as of the Cutoff Date (or a division or continuation of such an application) 
and issued subsequent to the Cutoff Date, then Bayer shall only be obligated 
to pay to Pharmacopeia  [ * * * ]  percent  [ * * * ]  of the milestone 
payment above with respect to such Derivative Compound (or a corresponding 
Agreement Product).

          6.2.3  EXCLUSIONS.  Notwithstanding Section 6.2.1 above, in the 
event that any Derivative Compound which Bayer elects to develop (i) is 
conceived later than  [ * * * ]  years after the end of the Research Program, 
as it may be extended, as shown by contemporaneous written evidence, and (ii) 
is not (a) within the scope of a patent within the Licensed Technology, Joint 
Inventions or Bayer Technology issued as of the Cutoff Date, or (b) within 
the scope of a patent within the Licensed Technology, Joint Inventions or 
Bayer Technology issued from a patent application pending as of the Cutoff 
Date (or a division or continuation of such an application) and issued 
subsequent to the Cutoff Date, then Bayer shall not be obligated to pay to 
Pharmacopeia any milestone payments above with respect to such Derivative 
Compound (or a corresponding Agreement Product).

          6.2.4  LEAD COMPOUND.  A Lead Compound shall be deemed to have been 
identified at such time as Bayer, by action of the International Research 
Committee ("IRC")

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<PAGE>

or its successor (i) identifies a Designated Compound with the potency, IN 
VITRO specificity and, if applicable, IN VIVO activity in an animal model, in 
each case, as agreed by the parties pursuant to Section 2.1(d) above, or
(ii) approves a strategic project based on an Other Compound. In any event, 
however, if Bayer, or any Affiliate, Sublicensee or other designee commits 
five or more chemists to perform medicinal chemistry optimization with 
respect to a particular Agreement Compound, the milestone payment due upon 
identification of a Lead Compound corresponding to such Agreement Compound 
shall have been paid to Pharmacopeia. Within thirty (30) days after the 
earlier of the occurrence of (i) an IRC (or corresponding) approval, or
(ii) the assignment of five chemists as set forth above, Bayer shall notify 
Pharmacopeia thereof.

          6.2.5  DEVELOPMENT CANDIDATE.  As used herein, "Development
Candidate" shall mean a Lead Compound or Derivative Compound therefrom which
possesses the desirable properties of a therapeutic agent for the prevention or
treatment of a clinical condition, in the absence of required safety trials
necessary to begin testing in humans or animals. A Development Candidate shall
have been deemed to have been nominated upon the date the International Product
Development Committee ("IPDC") of Bayer (or its successor) approves proceeding
with full development of such Agreement Compound. It is understood and agreed
that IN VIVO GLP toxicology trials and/or human clinical trials with respect to
an Agreement Compound will not be initiated without the approval of the IPDC,
which approval will be deemed to constitute nomination of a Development
Candidate.

          6.2.6  PAYMENTS.  All payments made to Pharmacopeia by Bayer 
pursuant to this Section 6.2 shall be due within thirty (30) days after the 
occurrence of the corresponding milestone and shall be nonrefundable and 
noncreditable. It is understood that the milestone payments set forth above 
shall be made with respect to each Agreement Compound and Agreement Product 
with activity against a particular molecular target; provided, however, that 
if Bayer ceases all development of a particular Agreement Compound (or 
corresponding Agreement Product) after having made payments with respect to 
such Agreement Compound and Agreement Product under this Section 6.2 on the 
accomplishment of milestones specified herein, there shall be no payment due 
upon the accomplishment of those same milestones with respect to the next 
Agreement Compound or Agreement Product hereunder that is directed at the 
same molecular target. Amounts due with respect to milestones achieved with 
respect to such subsequent Agreement Compound or Agreement Product which were 
not previously paid with respect to an earlier Agreement Compound or 
Agreement Product shall be paid pursuant to this Section 6.2.

     6.3  ROYALTIES TO PHARMACOPEIA.

          6.3.1  BASE ROYALTY.  Bayer shall pay to Pharmacopeia running 
royalties equal to  [ * * * ]  percent  [ * * * ]  of the aggregate Net Sales 
made by Bayer and its Affiliates and Sublicensees of Agreement Products, 
except that no royalties will be payable with respect to Excluded Products.

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<PAGE>

          6.3.2  ROYALTY RATE REDUCTION FOR DERIVATIVE COMPOUNDS. 
Notwithstanding Section 6.3.1 above, in the event that a Derivative Compound 
with activity in the Designated Field which Bayer elects to develop (i) is 
conceived later than  [ * * * ]  years after the end of the Research Program, 
as it may be extended, but on or before  [ * * * ]  years following the end 
of the Research Program, as it may be extended, as shown by contemporaneous 
written evidence, and (ii) is not (a) within the scope of a patent within the 
Licensed Technology, Joint Inventions or Bayer Technology issued as of the 
Cutoff Date, or (b) within the scope of a patent within the Licensed 
Technology, Joint Inventions or Bayer Technology issued from a patent 
application pending as of the Cutoff Date (or a division or continuation of 
such an application) and issued subsequent to the Cutoff Date, then Bayer 
shall only be obligated to pay to Pharmacopeia  [ * * * ]  percent  [ * * * ] 
 of the royalties above with respect to such Derivative Compound (or a 
corresponding Agreement Product).

          6.3.3  EXCLUSIONS.  Notwithstanding Section 6.3.1 above, in the 
event that any Derivative Compound which Bayer elects to develop (i) is 
conceived later than  [ * * * ]  years after the end of the Research 
Program, as it may be extended, as shown by contemporaneous written evidence, 
and (ii) is not (a) within the scope of a patent within the Licensed 
Technology, Joint Inventions or Bayer Technology, issued as of the Cutoff 
Date, or (b) within the scope of a patent within the Licensed Technology, 
Joint Inventions or Bayer Technology issued from a patent application pending 
as of the Cutoff Date (or a division, or continuation of such an application) 
and issued subsequent to the Cutoff Date, then Bayer shall not be obligated 
to pay to Pharmacopeia any royalties above with respect to such Derivative 
Compound (or a corresponding Agreement Product).

          6.3.4  TRADE SECRET ROYALTIES.  The parties acknowledge and agree 
that the principal value contributed by Pharmacopeia is accelerated time to 
market, enhanced probability of success and the potential for multiple target 
leads, and that Pharmacopeia may not own or control patent applications or 
patents covering the manufacture, sale or use of a particular Agreement 
Product. Bayer acknowledges and agrees that the value Bayer receives 
hereunder is in the access to the Libraries and accordingly Bayer shall pay 
the royalties at the rate specified in this Section 6.3, regardless of 
whether an Agreement Product is covered by a patent application or patent 
within the Licensed Technology, Joint Inventions or Bayer Technology unless 
in any  country or countries in which Bayer or its Affiliates or Sublicensees 
are selling an Agreement Product, a third party which is not an Affiliate or 
Sublicensee of Bayer is selling a directly similar competing Agreement 
Product and sales of such third party(ies) directly similar competing 
Agreement Product constitute  [ * * * ]  percent  [ * * * ]  or more of the 
Net Sales of the Agreement Product in such country. In the event the above 
described conditions are met, the royalty rate on Net Sales of such Agreement 
Product in such country for the period in which such competing sales exceed  
[ * * * ]  percent  [ * * * ]  of the Net Sales in such country shall be  
[ * * * ]  the royalty due pursuant to Section 6.3.1 or 6.3.2, as the case 
may be.

          6.3.5  SINGLE ROYALTY; NONROYALTY SALES.  No royalty shall be payable
under this Section 6.3 with respect to sales of Agreement Products among Bayer
or its Affiliates

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                                      -25-

<PAGE>

and Sublicensees for resale; and in no event shall more than one royalty be due
hereunder with respect to any Agreement Product unit even if covered by more
than one patent included in the Licensed Technology.

          6.3.6  ROYALTY TERM.  Bayer's obligation to pay royalties to 
Pharmacopeia under this Section 6.3 shall continue for each Agreement 
Product, on a country-by-country basis, until the date which is the later of 
(i)  [ * * * ]  after the first commercial sale of such Agreement Product in 
such country by Bayer, its Affiliates or Sublicensees, or (ii) the expiration 
of the last to expire issued patent within the Licensed Technology containing 
any claim which would be infringed by making, using or selling the applicable 
Agreement Product in the applicable country in the absence of the license 
grants in this Agreement.

          6.3.7  THIRD PARTY ROYALTIES.  Bayer shall be responsible for the
payment of any royalties due to third parties upon the manufacture, use,
marketing, sale or distribution of Agreement Products by Bayer or its Affiliates
or Sublicensees (except as to payments due pursuant to the Columbia License,
which shall be the responsibility of Pharmacopeia). It is understood that
Pharmacopeia shall be responsible for any royalties due third parties with
respect to intellectual property required for the preparation of the Focused
Libraries or decoding of Library Compounds.

     6.4  EQUITY INVESTMENT.  Simultaneously with the execution of this
Agreement Pharmacopeia and Bayer shall execute a Common Stock Purchase Agreement
in the form attached hereto as Exhibit C (the "Purchase Agreement") providing
for the purchase by Bayer of shares of Common Stock of Pharmacopeia, on the
terms and conditions therein.

                                    ARTICLE 7
                           PAYMENTS; BOOKS AND RECORDS

     7.1  ROYALTY REPORTS AND PAYMENTS.  After the first commercial sale of an
Agreement Product on which royalties are payable by Bayer hereunder, Bayer shall
make quarterly written reports to Pharmacopeia within ninety (90) days after the
end of each calendar quarter, stating in each such report, separately for Bayer
and each of its Affiliates and Sublicensees, the number, description, and
aggregate Net Sales, by country, of each Agreement Product sold during the
calendar quarter upon which a royalty is payable under Section 6.3 above.
Concurrently with the making of such reports, Bayer shall pay to Pharmacopeia
royalties due at the rates specified in Section 6.3.

     7.2  PAYMENT METHOD.  All payments due under this Agreement shall be made
by bank wire transfer in immediately available funds to an account designated by
Pharmacopeia. All payments hereunder shall be made in U.S. dollars. Any payments
that are not paid on the date such payments are due under this Agreement shall
bear interest to the extent permitted by applicable law at the prime rate as
reported by the Chase Manhattan Bank, New

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<PAGE>

York, New York, on the date such payment is due, calculated on the number of
days such payment is delinquent.

     7.3  PLACE OF ROYALTY PAYMENT AND CURRENCY CONVERSIONS.  If any currency
conversion shall be required in connection with the calculation of royalties
hereunder, such conversion shall be made using the selling exchange rate for
conversion of the foreign currency into U.S. Dollars, quoted for current
transactions reported in THE WALL STREET JOURNAL for the last business day of
the calendar quarter to which such payment pertains. If at any time legal
restrictions prevent the prompt remittance of any royalties owed on Net Sales in
any jurisdiction, Bayer may make such payments by depositing the amount thereof
in local currency in a bank account or other depository in such country in the
name of Pharmacopeia. Bayer shall promptly notify Pharmacopeia of the
circumstances leading to such deposit and, at Pharmacopeia's request, cooperate
with Pharmacopeia to repatriate such amounts.

     7.4  RECORDS; INSPECTION.  Bayer and its Affiliates and Sublicensees shall
keep complete, true and accurate books of account and records for the purpose of
determining the royalty amounts payable under this Agreement. Such books and
records shall be kept at the principal place of business of such party, as the
case may be, for at least three (3) years following the end of the calendar
quarter to which they pertain. Such records will be open for inspection during
such three (3) year period by a public accounting firm to whom Bayer has no
reasonable objection, solely for the purpose of verifying royalty statements
hereunder. Such inspections may be made no more than once each calendar year, at
reasonable times and on reasonable notice. Inspections conducted under this
Section 7.4 shall be at the expense of Pharmacopeia, unless a variation or error
producing an increase exceeding five percent (5%) of the amount stated for any
period covered by the inspection is established in the course of any such
inspection, whereupon all reasonable costs relating to the inspection for such
period and any unpaid amounts that are discovered will be paid promptly by Bayer
together with interest thereon from the date such payments were due at the prime
rate as reported by the Chase Manhattan Bank, New York, New York. Pharmacopeia
agrees to hold in strict confidence all information concerning royalty payments
and reports, and all information learned in the course of any audit or
inspection, except to the extent necessary for Pharmacopeia to reveal such
information in order to enforce its rights under this Agreement or if disclosure
is required by law. The public accounting firm employees shall sign a customary
confidentiality agreement as a condition precedent to their inspection, and
shall report to Pharmacopeia only that information which would be contained in a
properly prepared royalty report by Bayer.

     7.5  TAX MATTERS.

          7.5.1  WITHHOLDING TAXES.  All royalty amounts required to be paid
to Pharmacopeia pursuant to this Agreement shall be paid with deduction for
withholding for or on account of any taxes (other than taxes imposed on or
measured by net income) or similar governmental charge imposed by a jurisdiction
other than the United States ("Withholding

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<PAGE>

Taxes") to the extent Pharmacopeia and/or its Affiliates or their successors has
the lawful rights to utilize the Withholding Taxes paid by Bayer as a credit
against Pharmacopeia's and/or its Affiliates regular U.S. tax liability. Bayer
shall provide Pharmacopeia a certificate evidencing payment of any Withholding
Taxes hereunder.

          7.5.2  SALES TAXES.  Any sales taxes, use taxes, transfer taxes or
similar governmental charges required to be paid in connection with the transfer
of the Libraries, shall be the sole responsibility of Bayer. In the event that
Pharmacopeia is required to pay any such amounts, and reasonably documents
payment, Bayer shall promptly remit payment to Pharmacopeia of such amounts.

                                    ARTICLE 8
                                  DUE DILIGENCE

     8.1  DUE DILIGENCE.  The selection of Designated Compounds, Other
Compounds, Derivative Compounds and Agreement Products for development and
commercialization shall be in the sole discretion of Bayer. Bayer shall, at
Bayer's expense, be responsible for conducting all development of Agreement
Compounds and Agreement Products, and all commercialization of Agreement
Products. Bayer shall use its reasonable efforts to develop and commercialize at
least one Agreement Product in the Designated Field as expeditiously as
practicable and take such other actions as are necessary to obtain government
approvals to market each Agreement Product in the Major Countries and other
significant markets throughout the world, and thereafter to promote each
Agreement Product and meet the market demand therefor in such markets.

     8.2  REPORTS.  During the term of this Agreement, Bayer shall provide
Pharmacopeia with written semi-annual reports within thirty (30) days of the end
of each six (6) month period providing at least the following information:

          8.2.1  DESIGNATED COMPOUNDS.  With respect to Agreement Compounds
which are Designated Compounds or Derivative Compounds thereof: (i) description
of the status of the research and development activities conducted with respect
to each Agreement Compound; and (ii) the status of all patent applications
claiming such Agreement Compounds.

          8.2.2  OTHER COMPOUNDS.  With respect to Agreement Compounds which
are Other Compounds or Derivative Compounds thereof: (i) identification, on a
coded basis, of all targets against which each Agreement Compound demonstrated
activity (i.e., with targets designated by a random identification number
selected by Bayer); (ii) description of the status of research and development
activities conducted with respect to each target relating to Agreement
Compounds; and (iii) the status of all patent applications claiming such
Agreement Compounds.

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<PAGE>

The reports subject to  this Section 8.2 shall contain sufficient information to
allow Pharmacopeia to monitor Bayer's compliance with this Agreement, including
without limitation, Bayer's obligations with respect to the accomplishment of
the milestones set forth in Section 6.2.1. Until first commercial introduction
of each royalty-bearing Agreement Product by or on behalf of Bayer hereunder,
Bayer shall keep Pharmacopeia apprised of the status of the pre-clinical,
clinical and commercial development of that Agreement Product by semi-annually
providing Pharmacopeia with a written report detailing such activities with
respect to each applicable Agreement Product during the term of this Agreement.
All reports and information provided under this Section 8.2 shall be deemed
Confidential Information of Bayer.

     8.3  LICENSE BACK. In the event that Bayer agrees to allow Pharmacopeia to
acquire rights to any Agreement Compound or Agreement Product, then the parties
shall negotiate in good faith terms under which Pharmacopeia will receive an
exclusive, worldwide license, with the right to grant sublicenses, to make, have
made, use, import, have imported, offer for sale, sell or otherwise exploit such
Agreement Compound or Agreement Product.

     8.4  LICENSE TO LIBRARY COMPOUNDS FROM A BAYER RANDOM LIBRARY AFTER THE
EXCLUSIVITY PERIOD.  Following the Exclusivity Period with respect to a Library
Compound from a Bayer Random Library, for each such Library Compound which is
not a Designated Compound, in the event that Pharmacopeia determines that any
such Library Compound, which is claimed in a Bayer patent application or patent
claiming a Designated Compound, has a biological activity distinct from the
utility claimed in such patent application or patent, Pharmacopeia may provide
Bayer with evidence reasonably demonstrating that such Library Compound has such
distinct activity. Bayer shall have a period of ninety (90) days from receipt of
such notice in which to provide Pharmacopeia with evidence reasonably
demonstrating that such Library Compound has the utility claimed in the patent
application or patent. In the event that Bayer fails to provide such evidence,
Bayer and its Affiliates agree to grant and hereby grant to Pharmacopeia, an
exclusive, worldwide, royalty-free license, with the right to grant and
authorize sublicenses, under any applicable Joint Inventions and Bayer
Technology necessary to make, have made, use, have used, import, have imported,
sell, have sold and offer for sale such Library Compound or products based
thereon.

     8.5  REGULATORY FILINGS.  If Pharmacopeia acquires rights from Bayer with
respect to any Agreement Compound or Agreement Product pursuant to Section 8.3
above, upon the request of Pharmacopeia, Bayer may, in exchange for agreed
consideration, provide Pharmacopeia with access to and the right to use all
regulatory filings made by Bayer or its Affiliates or Sublicensees to the extent
possible with respect to such Agreement Compound or Agreement Product, together
with the underlying pre-clinical and clinical data relating thereto, and agreed
government permits and health registrations and other rights pertaining
thereto.

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<PAGE>

                                    ARTICLE 9
                              INTELLECTUAL PROPERTY


     9.1  OWNERSHIP OF INVENTIONS.  Title to all inventions and other
intellectual property made by employees of Bayer or its Affiliates, but not
Pharmacopeia, in connection with and arising out of the Research Program ("Bayer
Inventions") shall be deemed owned by Bayer. Title to all inventions and other
intellectual property made solely by employees of Pharmacopeia, but not Bayer or
its Affiliates, in connection with and arising out of with the Research Program
("Pharmacopeia Inventions") shall be deemed owned by Pharmacopeia. Title to all
inventions and other intellectual property made jointly by employees of Bayer or
its Affiliates and Pharmacopeia in connection with and arising out of the
Research Program ("Joint Inventions") shall be deemed jointly owned by
Pharmacopeia and Bayer. Inventorship of inventions and other intellectual
property rights conceived and/or reduced to practice pursuant to this Agreement,
and rights of ownership with respect thereto, shall be discussed by patent
counsel of Bayer and Pharmacopeia prior to the filing of each patent application
subject to this Agreement. Inventorship shall be determined in accordance with
the patent laws of the country or countries in which such inventions or other
intellectual property were made. In the event that the parties disagree as to
inventorship and/or the applicable law with respect to any invention or patent
application, such matter shall be subject to resolution pursuant to Section
14.13.

     9.2  PATENT PROSECUTION.

          9.2.1  RESPONSIBILITIES.

                 (a)  PHARMACOPEIA INVENTIONS.  Pharmacopeia shall be 
responsible for preparing, filing, prosecuting and maintaining in the Core 
Countries and such other countries it deems appropriate, patent applications 
and patents relating to all Pharmacopeia Inventions included within the 
Licensed Technology and conducting any interferences, re-examinations, 
reissues and oppositions relating to such Licensed Technology. As used in 
this Agreement, "Core Countries" shall mean the United States, Canada, Europe 
(members of the European Patent Convention via European Patent Office 
applications) and Japan.

                 (b)  JOINT INVENTIONS.  Subject to Section 9.2.3 and 9.2.4, 
Pharmacopeia shall be responsible for preparing, filing, prosecuting and 
maintaining in the Core Countries and such additional countries designated by 
Bayer, patent applications and patents relating to all Joint Inventions 
included within the Licensed Technology (except those claiming Designated 
Compounds or Derivative Compounds originating in Focused Libraries or the use 
of such Designated Compounds or Derivative Compounds) and conducting any 
interferences, re-examinations, reissues and oppositions relating to such 
Licensed Technology.

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<PAGE>

                 (c)  BAYER INVENTIONS.  Bayer shall be responsible for 
preparing, filing, prosecuting and maintaining worldwide in such countries it 
deems appropriate, patent applications and patents, and conducting any 
interferences, re-examinations, reissues, oppositions or requests for patent 
term extension or governmental equivalents thereto relating to Bayer 
Inventions and relating to Joint Inventions claiming Designated Compounds or 
Derivative Compounds originating in Focused Libraries or the use of such 
Designated Compounds or Derivative Compounds.

          9.2.2  PHARMACOPEIA FAILURE TO PROSECUTE.  Pharmacopeia may elect upon
ninety (90) days prior notice to discontinue prosecution of any patent
applications filed pursuant to Section 9.2.1 (a) or (b) above and/or not to file
or conduct any further activities with respect to the patent applications or
patents subject to such Sections. In the event Pharmacopeia declines to file or
having filed fails to further prosecute or maintain any patent applications or
patents (i) subject to Section 9.2.1(a) above which disclose or claim activity
in the Designated Field, or (ii) subject to Section 9.2.1(b) above, or conduct
any interferences, re-examinations, reissues, or oppositions, then, subject to
Pharmacopeia's agreements with third parties, Bayer shall have the right to
prepare, file, prosecute and maintain such patent applications and patents in
such countries worldwide it deems appropriate, and conduct any interferences,
re-examinations, reissues or oppositions at its sole expense.

          9.2.3  COOPERATION.  Each of Bayer and Pharmacopeia shall keep the
other fully informed as to the status of patent matters described in this
Article 9, including, without limitation, by providing the other the opportunity
to fully review and comment as far in advance of filing dates as feasible on any
documents which will be filed in any patent office, and providing the other
copies of any documents that such party receives from such patent offices
promptly after receipt, including notice of all interferences, reissues, re-
examinations, oppositions or requests for patent term extensions. Bayer and
Pharmacopeia shall each reasonably cooperate with and assist the other at its
own expense in connection with such activities, at the other party's request.
Patent counsel designated by each party will meet at least on a semi-annual
basis, unless otherwise agreed in writing, during (i) the term of the Research
Program; and (ii) the pendency of any patent applications claiming Joint
Inventions subject to this Section 9.2, to coordinate, discuss, review and
implement patent filing and prosecution strategy.

          9.2.4  COSTS.  Responsibilities for costs incurred under this
Article shall be as follows:

                 (i)     Subject to subsection (iii) below, Pharmacopeia shall
                         pay all costs pursuant to Section 9.2.1(a);

                (ii)     Bayer shall pay all costs incurred pursuant to Section
                         9.2.1(c);


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<PAGE>

               (iii)     The parties shall equally share the costs incurred
                         pursuant to Section 9.2.1(b); and any costs incurred by
                         Pharmacopeia in connection with the activities
                         undertaken pursuant to Section 9.2.1(a) with respect to
                         patent applications or patents disclosing or claiming
                         Focused Libraries or Library Compounds therein, or
                         methods of use thereof; and

                (iv)     Notwithstanding Section 9.2.4(iii) above, with respect
                         to total out-of-pocket expenses (including, without
                         limitation, patent attorney and agent fees) associated
                         with Pharmacopeia's activities pursuant to Sections
                         9.2.1(a) and (b) above, Pharmacopeia shall have no
                         obligation to incur in any calendar year more than the
                         greater of (i) $[ * * * ]  per calendar year, or 
                         (ii)  [ * * * ]  percent  [ * * * ]  of the 
                         milestones received by Pharmacopeia from Bayer 
                         pursuant to Section 6.2.1 herein in such calendar 
                         year. Pharmacopeia shall provide Bayer quarterly 
                         reports of the expenses incurred in connection with 
                         such activities to keep Bayer apprised of whether 
                         the patent activities are likely to incur costs in 
                         excess of those set forth in the preceding sentence. 
                         If it appears that the expenses would exceed such 
                         limit, Pharmacopeia shall provide Bayer notice thereof,
                         and within thirty (30) days of such notice Bayer 
                         shall notify Pharmacopeia whether it will reimburse 
                         Pharmacopeia for such excess amounts incurred by 
                         Pharmacopeia in connection with such activities. 
                         If Bayer so notifies Pharmacopeia then Pharmacopeia 
                         shall invoice such amounts and Bayer shall promptly 
                         pay such invoice(s).

          9.2.5   COPIES.  Bayer shall promptly provide to Pharmacopeia a copy
of any patent applications filed by Bayer or its Affiliates or Sublicensees
during the term of this Agreement with respect to any Agreement Compounds,
except with respect to Excluded Products. Pharmacopeia shall promptly provide to
Bayer a copy of any patent applications filed by Pharmacopeia during the term of
this Agreement with respect to any Agreement Compounds.

     9.3  ENFORCEMENT AND DEFENSE.

          9.3.1  ENFORCEMENT.  Each party shall promptly notify the other of
its knowledge of any potential infringement of the Licensed Technology by a
third party. Pharmacopeia has the right, but not the obligation, to take
reasonable legal action necessary to protect the Licensed Technology described
in Sections 9.2.1(a) and (b) against infringements by third parties. If within
six (6) months following receipt of such notice from Bayer, Pharmacopeia fails
to take such action to halt a commercially significant infringement, Bayer
shall, in its sole discretion, have the right, at its expense, to take such

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action as it deems warranted in its own name or in the name of Pharmacopeia or
jointly to cease any infringement with respect to Licensed Technology (i)
subject to Section 9.2.1(a) which claims Focused Libraries or Library Compounds
therein, or methods of use thereof, or (ii) subject to Section 9.2.1(b). Each
party agrees to render such reasonable assistance as the prosecuting party may
request. Costs of maintaining any such action and damages recovered therefrom
shall be paid by and belong to the party bringing the action. Bayer shall have
the right to enforce patents described in Section 9.2.1(c) in its sole
discretion, at its sole expense.

          9.3.2   INFRINGEMENT CLAIMS.  If the manufacture, sale or use of any
Agreement Product pursuant to this Agreement because of the practice of the
Licensed Technology, the Excluded Technology or the Bayer Technology results in
any claim, suit or proceeding alleging patent infringement against Pharmacopeia
or Bayer (or its Affiliates or Sublicensees), such party shall promptly notify
the other party hereto in writing setting forth the facts of such claim in
reasonable detail. The party subject to such claim shall have the exclusive
right and obligation to defend and control the defense of any such claim, suit
or proceeding, at its own expense, using counsel of its own choice; provided,
however, it shall not enter into any settlement which admits or concedes that
any aspect of the Bayer Technology (in the case of Pharmacopeia) and the
Licensed Technology or Excluded Technology (in the case of Bayer) is invalid or
unenforceable, without the prior written consent of such other party. The party
subject to the claim shall keep the other party hereto reasonably informed of
all material developments in connection with any such claim, suit or proceeding.

     9.4  GRANT BACK.

          9.4.1   COMPOUNDS BASED ON PHARMACOPEIA PROPRIETARY INFORMATION.  In
the event that Pharmacopeia determines that any Library Compound in a Focused
Library of the type defined in Section 1.20.2(iii) above, which Library Compound
(i) is not a Designated Compound or Other Compound, and (ii) is claimed in a
Bayer patent application or patent claiming a Designated Compound or Other
Compound, has a biological activity distinct from the utility disclosed in such
patent application or patent, and does not have the utility disclosed by Bayer,
Pharmacopeia may notify Bayer, and provide evidence reasonably demonstrating
that such Library Compound does not have the utility disclosed by Bayer. Bayer
shall have a period of ninety (90) days from receipt of such notice in which to
provide Pharmacopeia with evidence reasonably demonstrating that such Library
Compound has the utility disclosed in the patent application or patent. In the
event that Bayer fails to provide such evidence to the contrary within such
period, Pharmacopeia shall have the right to use such compound for such utility.

          9.4.2   PROCESS TECHNOLOGY.  Bayer shall grant and hereby grants to
Pharmacopeia a non-exclusive, royalty-free, worldwide, license under Bayer's
interest in the Joint Inventions relating to any chemical processes, synthetic
or otherwise, for the purpose of designing and preparing chemical libraries.

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<PAGE>

                                   ARTICLE 10
                                 CONFIDENTIALITY

     10.1  CONFIDENTIAL INFORMATION.  Except as otherwise expressly provided 
herein, the parties agree that, for the term of this Agreement and for  
[ * * * ]  thereafter, the receiving party shall not, except as expressly 
provided in this Article 10, disclose to any third party or use for any 
purpose any confidential information furnished to it by the disclosing party 
hereto pursuant to this Agreement ("Confidential Information") except to the 
extent that it can be established by the receiving party by competent proof 
that such information:

           (a)  was already known to the receiving party, other than under
an obligation of confidentiality, at the time of disclosure;

           (b)  was generally available to the public or otherwise part of
the public domain at the time of its disclosure to the receiving party;

           (c)  became generally available to the public or otherwise part
of the public domain after its disclosure and other than through any act or
omission of the receiving party in breach of this Agreement;

           (d)  was independently developed by the receiving party as
demonstrated by documented evidence prepared contemporaneously with such
independent development; or

           (e)  was disclosed to the receiving party, other than under an
obligation of confidentiality, by a third party who had no obligation to the
disclosing party not to disclose such information to others.

     10.2  PERMITTED USE AND DISCLOSURES.  Each party hereto may use or disclose
information disclosed to it by the other party to the extent such information is
included in the Licensed Technology or the Bayer Technology, as the case may be,
and to the extent such use or disclosure is reasonably necessary and permitted
in the exercise of such rights granted hereunder in filing or prosecuting patent
applications, prosecuting or defending litigation, complying with applicable
governmental regulations or court order or otherwise submitting information to
tax or other governmental authorities, conducting clinical trials, or making a
permitted sublicense or otherwise exercising license rights expressly granted by
the other party to it pursuant to the terms of this Agreement, provided that if
a party is required to make any such disclosure of another party's Confidential
Information, other than pursuant to a confidentiality agreement, it will give
reasonable advance notice to the other party of such disclosure and, save to the
extent inappropriate in the case of patent applications, will use its reasonable
best efforts to secure confidential treatment of such information in
consultation with the other party prior to its disclosure (whether through
protective orders or otherwise) and disclose only the minimum necessary to
comply with such requirements.

[ * * *  Confidential Treatment Requested. ]

                                      -34-

<PAGE>

     10.3  NONDISCLOSURE OF TERMS.  Each of the parties hereto agrees not to
disclose the terms of this Agreement to any third party without the prior
written consent of the other party hereto, which consent shall not be
unreasonably withheld, except to such party's attorneys, advisors, investors and
others on a need to know basis under circumstances that reasonably ensure the
confidentiality thereof, or to the extent required by law. Notwithstanding the
foregoing, the parties shall agree upon a press release to announce the
execution of this Agreement, together with a corresponding Q&A outline for use
in responding to inquiries about the Agreement; thereafter, Pharmacopeia and
Bayer may each disclose to third parties the information contained in such press
release and Q&A without the need for further approval by the other. In addition,
Bayer and Pharmacopeia may make public statements regarding the progress of the
Research Program and the achievement of milestones and fees with respect
thereto, following consultation and mutual agreement, the consent of neither
party to be unreasonably withheld. At least ten (10) business days before
submission, Pharmacopeia shall provide Bayer an opportunity to review any copy
of this Agreement which Pharmacopeia intends to file with the U.S. Securities
and Exchange Commission or equivalent entity.

     10.4  PUBLICATION.  Any manuscript, abstract or presentation (including
information to be presented verbally) by Pharmacopeia or Bayer or its Affiliates
describing the scientific results of the Research Program to be published during
the Research Program or within one (1) year at the end of the Research Program
shall be subject to the prior review of the parties at least ninety (90) days
prior to submission. Further, to avoid loss of patent rights as a result of
premature public disclosure of patentable information, the receiving party shall
notify the disclosing party in writing within thirty (30) days after receipt of
any disclosure whether the receiving party desires to file a patent application
on any invention disclosed in such scientific results. In the event that the
receiving party desires to file such a patent application, the disclosing party
shall withhold publication or disclosure of such scientific results until the
earlier of (i) a patent application is filed thereon, or (ii) the parties
determine after consultation that no patentable invention exists, or (iii) one
hundred eighty (180) days after receipt by the disclosing party of the receiving
party's written notice of the receiving party's desire to file such patent
application, or such other period as is reasonable for seeking patent
protection. Further, if such scientific results contain the information of the
receiving party that is subject to use and nondisclosure restrictions under this
Article 10, the disclosing party agrees to remove such information from the
proposed publication or disclosure. Following the filing of any patent
application with the Licensed Technology or Bayer Technology, in the eighteen
(18) month period prior to the publication of such a patent application neither
party shall make any public disclosure regarding a invention claimed in such
patent application without the prior written consent of the other party.


                                      -35-

<PAGE>

                                   ARTICLE 11
                         REPRESENTATIONS AND WARRANTIES

     11.1  BAYER.  Bayer represents and warrants on its own behalf and on behalf
of its Affiliates that: (i) it has the legal power, authority and right to enter
into this Agreement and to perform all of its obligations hereunder and (ii)
this Agreement is a legal and valid obligation binding upon it and enforceable
in accordance with its terms.

     11.2  PHARMACOPEIA.  Pharmacopeia represents and warrants that: (i) it has
the legal right and power to extend the rights granted in this Agreement; (ii)
this Agreement is a legal and valid obligation binding upon it and enforceable
in accordance with its terms; (iii) it has the full right to enter into this
Agreement, and to fully perform its obligations hereunder; (iv) it has not
previously granted, and during the term of this Agreement will not knowingly
make any commitment or grant any rights which are inconsistent in any material
way with the rights and licenses granted herein; (v) to the best of its
knowledge as of the Effective Date, there are no existing or threatened actions,
suits or claims pending against it with respect to the Licensed Technology; (vi)
to the best of its knowledge as of the Effective Date, the Licensed Technology
does not include intellectual property licensed from third parties that would
require Bayer to pay to such third parties a royalty to make, have made, use and
sell Agreement Products (vii) to the best of its knowledge as of the Effective
Date, the practice by Pharmacopeia of the Excluded Technology does not infringe
any intellectual property rights of third parties; and (viii) during the term of
the Research Program, Pharmacopeia will use reasonable efforts not to materially
breach the Columbia License.

     11.3  DISCLAIMER.  Bayer and Pharmacopeia specifically disclaim any
guarantee that the Research Program will be successful, in whole or in part. The
failure of the parties to successfully develop Agreement Compounds or Agreement
Products will not constitute a breach of any representation or warranty or other
obligation under this Agreement. Neither Bayer nor Pharmacopeia makes any
representation or warranty or guaranty that the Research Program will be
successful. EXCEPT AS OTHERWISE EXPRESSLY SET FORTH IN THIS AGREEMENT,
PHARMACOPEIA AND BAYER AND THEIR RESPECTIVE AFFILIATES MAKE NO REPRESENTATIONS
AND EXTEND NO WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED,
WITH RESPECT TO THE LICENSED TECHNOLOGY, EXCLUDED TECHNOLOGY, BAYER TECHNOLOGY,
BAYER RANDOM LIBRARIES, FOCUSED LIBRARIES, AGREEMENT COMPOUNDS, OTHER COMPOUNDS,
INFORMATION DISCLOSED PURSUANT TO ARTICLE 10 OR AGREEMENT PRODUCTS INCLUDING,
BUT NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE, VALIDITY OF ANY LICENSED TECHNOLOGY, EXCLUDED TECHNOLOGY OR BAYER
TECHNOLOGY, PATENTED OR UNPATENTED, OR NONINFRINGEMENT OF THE INTELLECTUAL
PROPERTY RIGHTS OF THIRD PARTIES.

                                      -36-

<PAGE>

                                   ARTICLE 12
                                 INDEMNIFICATION

     12.1  BAYER.  Bayer agrees to indemnify, defend and hold Pharmacopeia and
its Affiliates and their directors, officers, employees, agents and their
respective successors, heirs and assigns (the "Pharmacopeia Indemnities")
harmless from and against any losses, costs, claims, damages, liabilities or
expense (including reasonable attorneys' and professional fees and other
expenses of litigation) (collectively, "Liabilities") arising, directly or
indirectly out of or in connection with third party claims, suits, actions,
demands or judgments, including without limitation personal injury and product
liability matters, suits, actions or demands relating to (i) any Agreement
Products developed, manufactured, used, sold or otherwise distributed by or on
behalf of Bayer, its Affiliates, Sublicensees or other designees (including,
without limitation, product liability claims), (ii) Bayer and its Affiliates
performance of the Research Program; or (iii) any material breach by Bayer of
the representations and warranties made in this Agreement, except, in each case,
to the extent such Liabilities resulted from a material breach of this Agreement
by Pharmacopeia, or negligence or intentional misconduct on the part of
Pharmacopeia.

     12.2  PHARMACOPEIA.  Pharmacopeia agrees to indemnify, defend and hold
Bayer, its Affiliates and Sublicensees and their respective directors, officers,
employees, agents and their respective heirs and assigns (the "Bayer
Indemnitees") harmless from and against any losses, costs, claims, damages,
liabilities or expense (including reasonable attorneys' and professional fees
and other expenses of litigation) (collectively, "Liabilities") arising,
directly or indirectly out of or in connection with third party claims, suits,
actions, demands or judgments, including without limitation personal injury and
product liability matters, suits, actions, demands relating to (i) any Agreement
Products developed, manufactured, used, sold or otherwise distributed by or on
behalf of Pharmacopeia, its Affiliates, Sublicensees or other designees pursuant
to Section 8.3 herein (including, without limitation, product liability claims),
(ii) the performance of the Research Program by Pharmacopeia; and (iii) any
material breach by Pharmacopeia of the representations and warranties made in
this Agreement, except, in each case, to the extent such Liabilities resulted
from a material breach of this Agreement by Bayer or negligence or intentional
misconduct on the part of Bayer.

     12.3  PROCEDURE.  In the event that any Indemnitee intends to claim
indemnification under this Article 12 it shall promptly notify the other party
in writing of such alleged Liability. The indemnifying party shall have the
right to control the defense thereof with counsel of its choice as long as such
counsel is reasonably acceptable to Indemnitee; provided, however, that any
Indemnitee shall have the right to retain its own counsel at its own expense,
for any reason, including if representation of any Indemnitee by the counsel
retained by the indemnifying party would be inappropriate due to actual or
potential differing interests between such Indemnitee and any other party
reasonably represented by such counsel in such proceeding. The affected
Indemnitees shall cooperate with the indemnifying party and its legal
representatives in the investigation of any action, claim or liability covered

                                      -37-

<PAGE>

by this Article 12. The Indemnitee shall not, except at its own cost,
voluntarily make any payment or incur any expense with respect to any claim or
suit without the prior written consent of the indemnifying party, which such
party shall not be required to give.

                                   ARTICLE 13
                              TERM AND TERMINATION

     13.1  TERM.  Except as set forth below, the term of this Agreement shall
begin as of the Effective Date, and shall continue in full force and effect on a
country-by-country and Agreement Product-by-Agreement Product basis unless
terminated as provided in this Article 13 until Bayer, its Affiliates and
Sublicensees have no remaining royalty payment obligations in a country, at
which time the Agreement shall expire in its entirety in such country.

     13.2  TERMINATION FOR BREACH.  Either party to this Agreement may terminate
this Agreement as to any other party hereto in the event such other party shall
have materially breached or defaulted in the performance of any of its material
obligations hereunder, and such default shall have continued for sixty (60) days
after written notice thereof was provided to the breaching party by the
nonbreaching party. Any termination shall become effective at the end of such
sixty (60) day period unless the breaching party (or any other party on its
behalf) has cured any such breach or default prior to the expiration of the
sixty (60) day; provided, however, in the case of a failure to pay any amount
due hereunder, such default may be the basis of termination fifteen (15)
business days following the date that notice of such default was provided to the
breaching party.

     13.3  TERMINATION FOR INSOLVENCY.  If voluntary or involuntary 
proceedings by or against a party are instituted in bankruptcy under any 
insolvency law, or a receiver or custodian is appointed for such party, or 
proceedings are instituted by or against such party for corporate 
reorganization, dissolution, liquidation or winding-up of such party, which 
proceedings, if involuntary, shall not have been dismissed within sixty (60) 
days after the date of filing, or if such party makes an assignment for the 
benefit of creditors, or substantially all of the assets of such party are 
seized or attached and not released within sixty (60) days thereafter, the 
other party may immediately terminate this Agreement effective upon notice of 
such termination.

     13.4  TERMINATION DUE TO ACQUISITION.  During the Initial Term, if any 
third party which is a competitor of Bayer shall purchase substantially all 
the assets of Pharmacopeia or if there is a change of control of 
Pharmacopeia, Bayer may terminate this Agreement effective ninety (90) days 
after written notice is transmitted to Pharmacopeia, its parent, successor, 
surviving or new entity, as the case may be. As used herein, change of 
control shall mean the acquisition by a third party which is a competitor of 
Bayer of forty percent (40%) or more of the voting stock of Pharmacopeia.

                                      -38-

<PAGE>

     13.5  EFFECT OF BREACH OR TERMINATION.

           13.5.1  ACCRUED RIGHTS AND OBLIGATIONS.  Termination of this 
Agreement for any reason shall not release any party hereto from any 
liability which, at the time of such termination, has already accrued to the 
other party or which is attributable to a period prior to such termination, 
nor preclude either party from pursuing any rights and remedies it may have 
hereunder or at law or in equity which accrued or are based upon any event 
occurring prior to such termination.

          13.5.2  RETURN  OF MATERIALS.  Upon any termination of this 
Agreement, Bayer and Pharmacopeia shall promptly return to the other all 
Confidential Information (including, without limitation, all Existing and 
Future Know-How and Bayer Technology, as the case may be), received from the 
other party (except one copy of which may be retained for archival purposes).

          13.5.3  POST-TERMINATION PRODUCT SALES.  In the event of the 
cancellation or termination of any license rights with respect to an 
Agreement Product prior to the expiration of this Agreement, inventory of the 
Agreement Product may be sold for up to six (6) months after date of 
termination, provided earned royalties are paid thereon.

          13.5.4  LICENSES.  The licenses granted Bayer herein shall 
terminate in the event of a termination by Pharmacopeia pursuant to Section 
13.2 or 13.3, and any licenses granted to Pharmacopeia under Section 8.3 
shall terminate in the event of a termination by Bayer pursuant to Section 
13.2, 13.3, or 13.4; provided, however, in the event of a termination by 
Bayer pursuant to Section 13.4, the licenses granted by Pharmacopeia shall 
remain in effect with respect to Licensed Technology existing as of the 
effective date of such termination, subject to the terms and conditions of 
this Agreement. If more than one Agreement Product is being commercially 
developed or exploited by Bayer or its Affiliates or Sublicensees hereunder 
and a breach entitling Pharmacopeia to terminate this Agreement relates 
solely to a single Agreement Product, then Pharmacopeia shall be entitled to 
terminate this Agreement only with respect to the applicable Agreement 
Product.

     13.6  SURVIVAL.  Articles 10, 11, 12, 13 and 14 of this Agreement, as 
well as Sections 2.7, 2.8, 2.9, 2.10, 4.1, 4.5, 5.3, 5.5, 5.7, 5.8, 7.1, 7.4, 
7.5, 8.3, 8.4, 8.5, 9.1, 9.2 and 9.4 shall survive the expiration or 
termination of this Agreement for any reason.

                                   ARTICLE 14
                                  MISCELLANEOUS

     14.1  GOVERNING LAWS.  This Agreement and any dispute arising from the
performance or breach hereof shall be governed by and construed and enforced in
accordance with, the laws of the state of New York, without reference to
conflicts of laws principles and excluding the United Nations Convention on the
International Sale of Goods.

                                      -39-

<PAGE>

     14.2  NO IMPLIED LICENSES.  Only the licenses granted pursuant to the
express terms of this Agreement shall be of any legal force or effect. No other
license rights shall be created by implication, estoppel or otherwise.

     14.3  WAIVER.  It is agreed that no waiver by either party hereto of any
breach or default of any of the covenants or agreements herein set forth shall
be deemed a waiver as to any subsequent and/or similar breach or default.

     14.4  ASSIGNMENT.  This Agreement shall not be assignable by either 
party to any third party hereto without the written consent of the other 
party hereto, except in the case of Bayer to its designated Affiliate(s), 
provided Bayer guarantees the performance of such Affiliate(s) in a customary 
manner; except either party may assign this Agreement, without such consent, 
to an entity that acquires all or substantially all of the business or assets 
of such party to which this Agreement pertains, whether by merger, 
reorganization, acquisition, sale, or otherwise. This Agreement shall be 
binding upon and accrue to the benefit any permitted assignee, and any such 
assignee shall agree to perform the obligations of the assignor.

     14.5  INDEPENDENT CONTRACTORS.  The relationship of the parties hereto 
is that of independent contractors. The parties hereto are not deemed to be 
agents, partners or joint venturers of the others for any purpose as a result 
of this Agreement or the transactions contemplated thereby.

     14.6  COMPLIANCE WITH LAWS.  In exercising their rights under this 
license, the parties shall fully comply in all material respects with the 
requirements of any and all applicable laws, regulations, rules and orders of 
any governmental body having jurisdiction over the exercise of rights under 
this license including, without limitation, those applicable to the 
discovery, development, manufacture, distribution, import and export and sale 
of pharmaceutical products pursuant to this Agreement.

     14.7  PATENT MARKING.  Bayer agrees to mark and have its Affiliates and 
Sublicensees mark all Agreement Products sold pursuant to this Agreement in 
accordance with the applicable statute or regulations relating to patent 
marking in the country or countries of manufacture and sale thereof.

     14.8  NOTICES.  All notices, requests and other communications hereunder 
shall be in writing and shall be personally delivered or by registered or 
certified mail, return receipt requested, postage prepaid, in each case to 
the respective address specified below, or such other address as may be 
specified in writing to the other parties hereto and shall be deemed to have 
been given upon receipt:

                                      -40-

<PAGE>