printer-friendly

Sample Business Contracts

Research Collaboration and License Agreement - ArQule Inc. and Cubist Pharmaceuticals Inc.

Sponsored Links

                            CONFIDENTIAL TREATMENT
                                       
                 RESEARCH COLLABORATION AND LICENSE AGREEMENT

     This Research Collaboration and License Agreement (this "Agreement") is
entered into as of October 22, 1997 (the "Effective Date") by and between
ArQule, Inc. ("ArQule"), a Delaware corporation, and Cubist Pharmaceuticals,
Inc. ("Cubist"), a Delaware corporation.

                                   RECITALS

     WHEREAS, ArQule and Cubist previously entered into a Material Transfer and
Screening Agreement dated June 4, 1996 (the "MTA") pursuant to which ArQule
delivered certain of its Mapping Array-TM- compounds to Cubist, and Cubist
screened those compounds against certain of its proprietary targets;

     WHEREAS, Cubist detected activity of certain ArQule compounds against
Cubist certain Cubist targets;

     WHEREAS, pursuant to the terms of the MTA, ArQule and Cubist have
negotiated this Agreement to expand their joint research activities and to
pursue further development of the active compounds discovered by Cubist.

     NOW, THEREFORE, ArQule and Cubist hereby agree as follows:

1.   Definitions.

     1.1. "Active Compound" means any ArQule Compound which exhibits confirmed
significant functional activity against a Target, as determined by the Research
Committee.

     1.2. "Affiliate" means any legal entity (such as a corporation, 
partnership, or limited liability company) that is controlled by a party.  
For the purposes of this definition, the term "control"" means (i) beneficial 
ownership of at least fifty percent (50%) of the voting securities of a 
corporation or other business organization with voting securities or (ii) a 
fifty percent (50%) or greater interest in the net assets or profits of a 
partnership or other business organization without voting securities.

                                       
<PAGE>


     1.3. "ArQule Compound" means a small organic chemical molecule that is
synthesized by ArQule and provided by ArQule to Cubist under this Agreement, as
well as Derivatives of such ArQule Compound.

     1.4. "Array" means a set of ArQule Compounds consisting of diverse,
structurally related small organic chemical compounds arranged in a spatially
addressable format such as a microliter screening plate.

     1.5. "Available Compound" means an ArQule Compound that is not (i) licensed
or otherwise committed to a third party in the Field or (ii) committed to an
internal ArQule program in the Field.  "Available Active Compound" means an
Active Compound that is also an Available Compound.

     1.6. "Chemical Theme" means the chemical or structural characteristics
shared by a group of Active Compounds, as determined by the Research Committee.

     1.7. "Clinical Candidate" means a Collaboration Compound that the Research
Committee has selected for Clinical Development.

     1.8. "Clinical Development" means the clinical development of a compound
after an IND is filed and approved, including Phase I, Phase II and Phase III
Clinical Trials, and resulting in the filing of a complete NDA.

     1.9. "Clinical Development Plan" means a plan for Clinical Development of
one or more Clinical Candidates as approved by the Research Committee and the
Steering Committee for a Collaboration Project.  The Clinical Development Plan
will include a detailed description of the specific responsibilities of each
party for various Clinical Development activities, or plans to oursource certain
tasks, and a proposed timetable for accomplishment of certain objectives for the
Collaboration Project.

     1.10.  "Collaboration" means the collaborative research and development
program described in Article 3 of this Agreement.

     1.11.  "Collaboration Compound" means any Available Active Compound
designated by the Research Committee as a Collaboration Compound pursuant to
Subsection 3.3.(d) or 3.4.(e).

     1.12.  "Collaboration Project" means a project for the Lead
Optimization, Preclinical Development, and Clinical Development of one 


                                       2
<PAGE>

or more Collaboration Compounds for a Target, as approved by the Research
Committee and the Steering Committee.

     1.13.  "Collaborator" means any third party with whom a party enters 
into an agreement pursuant to which such party grants or receives rights in
proprietary technology, intellectual property, or the commercial value of a
product.  For example, an ArQule Collaborator shall include a third party who
participates in a Mapping Array Program or Directed Array Program, and a Cubist
Collaborator shall include a third party who obtains license rights to Cubist
Patent Rights and Cubist Technology.

     1.14.  "Commercialization Plan" means a plan for the commercialization
of a Collaboration Compound as approved by the Steering Committee.

     1.15.  "Confidential Information" means any technical or business
information furnished by one party (the "Disclosing Party") to the other party
(the "Receiving Party") in connection with this Agreement.  Such Confidential
Information may include, without limitation, the identity of a chemical
compound, the use of a chemical compound, trade secrets, know-how, inventions,
technical data or specifications, testing methods, business or financial
information, research and development activities, Steering Committee reports,
Research Committee reports, royalty reports, product and marketing plans, and
customer and supplier information.

     1.16.  "Derivative" means a chemical compound structurally derived in
one or more steps from an ArQule Compound by a process of modification or
partial substitution of at least one component wherein at least one structural
feature is retained at each process step.  The number of intermediate steps or
compounds is not relevant to the classification of a compound as a "Derivative
Compound." A compound need not have any structural similarity to another
compound in order to be classified as a Derivative Compound.

     1.17.  "Directed Array-TM-" means Array of ArQule Compounds based on one
or more Collaboration Compounds that have the same Chemical Theme and that
exhibit activity for the same Target, which Arrays shall be synthesized by
ArQule for Lead Optimization.  The term "Directed Array" is a trademark owned by
ArQule.  The process of synthesizing and testing Directed Arrays based on a
Collaboration Compound is known as a "Directed Array Program."

     1.18.  "FDA" means the United States Food and Drug Administration (or
its foreign equivalent in Japan or Europe).


                                       3
<PAGE>


     1.19.  "Field" means human and animal therapeutic applications, as well
as diagnostic applications intended for use with such therapeutic products.

     1.20.  "IND" means an investigational new drug application filed with
the FDA prior to beginning clinical trials in humans or any comparable
application filed with the regulatory authorities of a country other than the
United States, prior to beginning clinical trials in humans in that country.

     1.21.  "Lead Optimization" means the iterative synthesis and testing of
analogs and derivatives of a compound in connection with a biological target to
identify a compound that exhibits certain optimal characteristics, such as
maximal activity, minimal toxicity, and an acceptable initial bioavailability
and pharmacokinetic, profile.

     1.22.  "Mapping Array-TM-" means an Array of ArQule Compounds that
ArQule generally makes available to its collaborators for screening on a
non-exclusive basis.  The term "Mapping Array" is a trademark owned by ArQule. 
The term "Mapping Array Program" generally describes an arrangement under which
ArQule provides a collaborator with Mapping Arrays and the collaborator screens
the Mapping Arrays on a non-exclusive basis, and specifically describes the
arrangement between ArQule and Cubist as set forth in Section 3.3.

     1.23.  "NDA" means a New Drug Application, as such term is defined by
the FDA, and any equivalent filing in a foreign jurisdiction.

     1.24.  "Patent Rights" means any United States patent application and
any divisional, continuation, or continuation-in-part of such patent application
(to the extent the claims are directed to subject matter specifically described
therein), as well as any patent issued thereon and any reissue or reexamination
of such patent, and any foreign counterparts to such patents and patent
applications.  "ArQule Patent Rights" means Patent Rights that are either (i)
assigned solely to ArQule, (ii) assigned jointly to ArQule and a party other
than Cubist, or (iii) licensed to ArQule, in each case to the extent that ArQule
has the ability to license or sublicense the rights required under this
Agreement.  "Cubist Patent Rights" means Patent Rights that are either (i)
assigned solely to Cubist, (ii) assigned jointly to Cubist and a party other
than ArQule, or (iii) licensed to Cubist, in each case to the extent that Cubist
has the ability to license or sublicense the rights required under this
Agreement.  "Joint Patent Rights" means Patent Rights assigned to both ArQule
and Cubist 


                                      4
<PAGE>

as joint owners.  Joint Patent Rights will include (i) Patent Rights claiming
Joint Technology and (ii) Patent Rights claiming both ArQule Technology and
Cubist Technology in a single filing.

     1.25.  "Phase I Clinical Trials" means clinical trials in a small number
of patients to determine the metabolism and pharmacologic actions of a product
in humans, the side effects associated with increasing doses and to gather
evidence on effectiveness and meeting the requirements established by the FDA
for Phase I clinical trials.

     1.26.  "Phase II Clinical Trials" means clinical trials in a small
sample of the intended patient population to assess the efficacy for a specific
indication of a compound proposed to be used as a therapeutic pharmaceutical
product, to determine dose tolerance and the optimal dose range as well as to
gather additional information relating to safety and potential adverse effects,
and meeting the requirements established by the FDA for Phase II clinical
trials.

     1.27.  "Phase III Clinical Trials" means clinical trials designed to
demonstrate safety and efficacy of a compound proposed to be used as a
therapeutic pharmaceutical product in an expanded patient population at
geographically dispersed study sites, meeting the requirements established by
the FDA for Phase III clinical trials.

     1.28.  "Preclinical Candidate" means a Collaboration Compound that the
Research Committee has selected for Preclinical Development.

     1.29.  "Preclinical Development" means the performance of animal testing
and other preclinical development activities that are required by the FDA to
file a complete IND.

     1.30.   Preclinical Development Plan" means a plan for Preclinical
Development of one or more Preclinical Candidates as approved by the Research
Committee and the Steering Committee for a Collaboration Project.  The
Preclinical Development Plan will include a detailed description of the specific
responsibilities of each party for various Preclinical Development activities
and a proposed timetable for accomplishment of certain objectives for the
Collaboration Project.

     1.31.  "Research Committee" means the Research Committee described in
Section 2. 1.

     1.32.  "Research Materials" means any tangible research materials,
whether biological, chemical, physical, or otherwise, including without

                                          5
<PAGE>
limitation all ArQule Compounds and Cubist assay reagents.  "Proprietary
Research Materials" means any Research Materials that a party designates as
proprietary or confidential, including without limitation all Mapping Array 
compounds and Directed Array compounds.

     1.33.  "Research Plan" means a plan for Lead Optimization of one or more
Collaboration Compounds as approved by the Research Committee and the Steering
Committee for a Collaboration Project.  The Research Plan will include a
detailed description of the specific responsibilities of each party for various
Lead Optimization activities and a proposed timetable for accomplishment of
certain objectives for the Collaboration Project.

     1.34.  "Steering Committee" means the Steering Committee described in
Section 2.2. of this Agreement.

     1.35.  "Sublicensee" means any non-Affiliate third party licensed by a
party to make, have made, use, or sell any Royalty-Bearing Product.

     1.36.  "Target" means each biological or molecular target selected by
Cubist for use in the Collaboration and for which Cubist has certain expertise
or proprietary technology, or both.

     1.37.  "Technology" it means any proprietary development, idea, design,
concept, technique, process, invention, Research Material, discovery, or
improvement, whether or not patentable or copyrightable.  "ArQule Technology"
means Technology that is either (i) assigned solely to ArQule, (H) assigned
jointly to ArQule and a party other than Cubist, or (iii) licensed to ArQule, in
each case to the extent that ArQule has the ability to license or sublicense the
rights required under this Agreement.  "Cubist Technology" means Technology that
is either (i) assigned solely to Cubist, (ii) assigned jointly to Cubist and a
party other than ArQule, or (iii) licensed to Cubist, in each case to the extent
that Cubist has the ability to license or sublicense the rights required under
this Agreement.  "Joint Technology" means Technology that is developed or
discovered jointly by one or more employees or consultants of Cubist and one or
more employees or consultants of ArQule in connection with the Collaboration.

2.   Management of Research Program.

     2.1. Research Committee.

          (a)  Creation of Research Committee.  The parties hereby create a
Research Committee which shall consist of four (4) members.


                                        6
<PAGE>

  Cubist shall designate two (2) members and ArQule shall designate two (2)
members.  If any member of the Research Committee dies, resigns, or becomes
incapacitated, the party which designated such member shall designate his or her
successor (whose term shall commence immediately), and any party may withdraw
the designation of any of its members of the Research Committee and designate a
replacement (whose term shall commence immediately) at any time by giving notice
of the withdrawal and replacement to the other party.  The chairperson of the
Research Committee shall be designated annually on an alternating basis between
the parties.  The initial chairperson shall be designated by the Research
Committee at its first meeting.  The party not designating the chairperson shall
designate one of its representatives as secretary to the Research Committee for
such year.

          (b)  Meetings of the Research Committee.  Regular meetings of the
Research Committee shall be held within forty-five (45) days of the end of each
calendar quarter, or at such other times as the parties may deem appropriate, at
such times and places as the members of the Research Committee shall from time
to time agree.  Special meetings of the Research Committee may be called by
either party on ten (10) days written notice to the other party unless notice is
waived by the parties.  All meetings shall alternate between the offices of the
parties unless the parties otherwise agree.  The chairperson shall be
responsible for sending notice of meetings to all members.  In the event a
Research Committee member is unable to attend a meeting of the Research
Committee, such Research Committee member may designate an alternate member who
will serve solely for that Research Committee meeting.

          (c)  Decisions of Research Committee.  A quorum of the Research
Committee shall be present at any meeting of the Research Committee if at least
one representative of each party is present at such meeting in person or by
telephone.  If a quorum exists at any meeting, the unanimous consent of all
members of the Research Committee present at such meeting is required to take
any action on behalf of the Research Committee.  Unless otherwise specifically
stated to the contrary herein, no individual party shall purport to act on
behalf of the other party unless and then only to the extent authorized to do so
by the Research Committee.

          (d)  Responsibilities of Research Committee.  The Research Committee
shall be responsible for the day-to-day conduct and progress of the
Collaboration, including without limitation:

               (i)   directing and administering the Collaboration;


                                       7
<PAGE>

               (ii)  providing a forum for the exchange of scientific 
                     information among the scientists participating in 
                     the Collaboration;

               (iii) determining the criteria of significant functional
                     activity necessary for an ArQule Compound to qualify 
                     as an Active Compound;

               (iv)  confirming that an ArQule Compound qualifies as an Active
                     Compound and designating such Active Compounds as
                     Collaboration Compounds;

               (v)   reviewing test reports provided by Cubist as to the
                     significant functional activity of each Collaboration
                     Compound in the Mapping Arrays and, based on such results,
                     determining which Collaboration Compounds and Chemical
                     Themes will be used in a Directed Array Program, with the
                     scope of each Chemical Theme determined on the basis of the
                     following criteria: (1) the specific reaction or reaction
                     sequence used to combine members of two or more discrete
                     chemical units in which each chemical unit bears the
                     functional group(s) required for the specific reaction(s)
                     that result in the combination of the chemical units; and
                     (2) the extent to which a class of compounds is related by
                     a recurring structural motif associated with a particular
                     biological activity;

               (vi)  selecting Mapping Arrays for delivery to Cubist under
                     Subsection 3.3. (a);

               (vii) determining the appropriate number of compounds that
                     ArQule should generate in a Directed Array based on
                     Collaboration Compounds with the same Chemical Theme, and
                     determining the appropriate amount of each compound in a
                     Directed Array that ArQule should deliver Cubist for 
                     further research and development with the relevant Target;

              (viii) determining whether to conduct Preclinical Development
                     of any Preclinical Candidate, as

                                        8
<PAGE>


                     well as the scope of such Preclinical Development;

               (ix)  determining and updating the list of Collaboration
                     Compounds, Preclinical Candidates, and Clinical Candidates
                     for each Target;

               (x)   resolving matters involving scientific questions;

               (xi)  preparing and updating the Research Plan, Preclinical
                     Development Plan, and Clinical Development Plan; and

               (xii) monitoring and managing Clinical Development
                     activities.

          (e)  Research Committee Reports.  Within ten (10) days following each
meeting of the Research Committee held pursuant to Subsection 2.1. (b), the
secretary of the Research Committee shall prepare and send to each party a
written report of actions taken at the meeting in such form and containing such
detail as shall be determined by the Research Committee.

          (f)  Deadlock.  In the event that the Research Committee cannot reach
agreement with respect to any matter that is subject to its decision-making
authority, then the matter shall be referred to the Steering Committee for
resolution.

     2.2. Steering Committee.

          (a)  Creation of Steering Committee.  The parties hereby also create a
Steering Committee which shall consist of four (4) members: (i) the Chief
Executive Officer or President of Cubist; (H) the Chief Executive Officer or
President of ArQule; (iii) the Director of Business Development at Cubist (or
such other similar position designated by Cubist from time to time) and (iv) the
Director of Business Development at ArQule (or such other similar position
designated by ArQule from time to time).  If any member of the Steering
Committee dies, resigns, or becomes incapacitated, the party which designated
such member shall designate his or her successor (whose term shall commence
immediately), and any party may withdraw the designation of any of its members
of the Steering Committee and designate a replacement (whose term shall commence
immediately) at any time by giving notice of the withdrawal 


                                       9
<PAGE>


and replacement to the other party.  The chairperson of the Steering Committee
shall be designated annually on an alternating basis between the parties.  The
party not designating the chairperson shall designate one of its representatives
as secretary of the Steering Committee for such year.

          (b)  Meetings of the Steering Committee.  Regular meetings of the
Steering Committee shall be   held within forty-five (45) days of the end of
each calendar year, or at such other times as the parties may deem appropriate,
at such times and places as the members of the Steering Committee shall from
time to time agree.  Special meetings of the Steering Committee may be called by
either party on fifteen (15) days written notice to the other party unless
notice is waived by the parties.  All meetings shall alternate between the
offices of the parties unless the parties otherwise agree.  In the event a
Steering Committee member is unable to attend a meeting of the Steering
Committee, such Steering Committee member may designate an alternate member who
will serve solely for that Steering Committee meeting.

          (c)  Decisions of the Steering Committee.  Unless otherwise
specifically designated as a responsibility of the Research Committee pursuant
to Subsection 2.1. (d), all decisions regarding the contractual and financial
relationship created by this Agreement shall be made by the Steering Committee
acting in accordance with this Agreement or by agents duly authorized in writing
by the Steering Committee.  A quorum of the Steering Committee shall be present
at any meeting of the Steering Committee if the President or Chief Executive
Officer of each party is present at such meeting in person or by telephone.  If
a quorum exists at any meeting, the unanimous consent of all members of the
Steering Committee present at such meeting is required to take any action on
behalf of the Steering Committee.  Unless otherwise specifically stated to the
contrary herein, no individual party shall purport to act on behalf of the other
party unless and then only to the extent authorized to do so by the Steering
Committee.

          (d)  Responsibility of Steering Committee.  The Steering Committee
shall be responsible for approving long-term objectives for, and evaluating the
progress of, the Collaboration and joint Clinical Development activities,
including without limitation:


     (i)   approval of all Research Plans, Preclinical Development Plans,
           Clinical Development Plans and all subsequent decisions regarding the
           direction and priority of all such plans;

                                      10
<PAGE>


     (ii)  reviewing and approving all third party collaborations involving the
           Research Plans, Preclinical Development Plans, and Clinical
           Development Plans;

     (iii) approval of all Clinical Development activities and associated
           expenses for Clinical Candidates; and

     (iv)  developing a Commercialization Plan and managing commercialization of
           Collaboration Compounds.

          (e)  Steering Committee Reports.  Within ten (10) days following each
meeting of the Steering Committee held pursuant to Subsection 2.2.(b), the
secretary of the Steering Committee shall prepare and send to the members of the
Steering Committee a detailed written report of actions taken at the meeting in
such form and containing such detail as shall be determined by the Steering
Committee.

          (f)  Deadlock.  In the event that the Steering Committee cannot reach
agreement within sixty (60) days as to any matter that is subject to its
decision-making authority, then (i) if the matter relates to this Agreement as a
whole, either party may terminate the Agreement in accordance with Section 8.4.
or (ii) if the matter relates only to specific activities under this Agreement,
such as designation of Active Compounds as Collaboration Compounds, the
initiation or conduct of Lead Optimization and Preclinical Development, the
initiation or conduct of Clinical Development, or approval of commercialization
plans, then the deadlock provision in the Agreement that is applicable to that
circumstance shall apply.

3.   Collaboration.

     3.1. Overview of Collaboration.  The overall purposes of this Collaboration
are (i) to screen Mapping Arrays to find ArQule Compounds that demonstrate
significant functional activity against selected Targets, (ii) to designate
certain of these Active Compounds as Collaboration Compounds that are committed
to the program, (iii) to perform Lead Optimization through a Directed Array
Program on certain of these Collaboration Compounds to develop one or more
Preclinical Candidates, (iv) to conduct Preclinical Development of these
Preclinical Candidates, and (v) to conduct Clinical Development of Preclinical
Candidates that successfully complete Preclinical Development and become
Clinical Candidates.  The initial screening will be conducted by Cubist under
the ArQule Mapping Array Program described below.  All Lead Optimization, 


                                       11
<PAGE>

     Preclinical Development, and Clinical Development activities will be
conducted by both parties on a project-by-project basis in accordance with a
Research Plan, Preclinical Development Plan, or Clinical Development Plan
approved by the parties.  Commercial exploitation of a Collaboration Compound
will proceed under a Commercialization Plan.  Separate Collaboration Projects
may be established in the discretion of the Research Committee based on the
relatedness of the Active Compounds and Targets identified.  These Collaboration
Projects may be conducted in series or in parallel at the discretion of the
Research Committee.  A Collaboration Project may terminate due to completion,
withdrawal of a party, deadlock of the parties, or lack of merit.

     3.2. Expenses and Revenues.

          (a)  Expenses Prior to Clinical Development.  [          ]* shall bear
the costs and expenses of its respective activities in connection with this
Collaboration prior to Clinical Development and shall promptly make payments to
third parties arising therefrom.  Neither party shall represent to creditors or
vendors that such party has any authority to obligate or bind the other party,
and shall affirmatively correct any misconception to that effect.  Neither party
shall use the name of the other party in connection with such transactions
without the prior written consent of the other party, which consent may be
withheld in its sole discretion.

          (b)  Expenses of Clinical Development.  [          ]* shall pay
[                   ]* of any direct expenses incurred in connection with
Clinical Development activities approved by the Steering Committee.  Prior to
commencement of any activities for Clinical Development or commercialization of
a Clinical Candidate, the Steering Committee shall establish guidelines and
procedures that will set forth the operational details of this arrangement.  The
Steering Committee may revise these operational guidelines and procedures in its
discretion.

          (c)  Revenues.  [          ]* shall receive [                   ]* of
all proceeds received in connection with commercialization of a Collaboration
Compound arising from the Collaboration.

     3.3. Conduct of Mapping Array Program.

          (a)  Delivery of Mapping Arrays.  Cubist acknowledges prior receipt of
Mapping Arrays #[                                                    


*    Confidential Treatment Requested:  material has been omitted and filed
     separately with the Commission.

                                      12
<PAGE>


   ]* pursuant to a Material Transfer and Screening Agreement dated June 4, 1996
between the parties, which prior agreement is hereby canceled and replaced by
this Agreement. The Research Committee shall select additional Mapping Arrays
for screening by Cubist. ArQule shall promptly deliver the selected Mapping
Arrays to Cubist. The delivered Mapping Arrays will have the standard ArQule
format of one ArQule Compound per well in 96 well microliter plates. Unless
ArQule otherwise notifies the Research Committee, each Mapping Array will
contain approximately the following amounts of each ArQule Compound in that
Array: [                                                                   
                                                                           
                                                                    ]* Cubist 
shall not attempt to identify any compounds in the Mapping Arrays.

          (b)  Identification of Active Compounds.  ArQule hereby grants Cubist
a nonexclusive, worldwide license (without the right to sublicense) under, the
ArQule Patent Rights and other rights in ArQule Technology to screen the
delivered Mapping Array compounds against any Targets in the Field. Cubist
agrees to screen the delivered Mapping Array compounds expeditiously and in a
scientifically sound manner. Cubist shall promptly disclose to ArQule the array
plate number and well number of any Active Compounds. ArQule will promptly
determine whether the Active Compounds are Available Compounds and notify Cubist
of such determination. If an Active Compound is not an Available Compound,
Cubist shall have no rights with respect to that Active Compound.  For Available
Active Compounds, ArQule shall disclose to Cubist the chemical composition and
structure of those Active Compounds, and Cubist shall disclose to ArQule the
identity of the Target, level of activity, and a description of the primary
assays used to detect the activity. All such information disclosed by ArQule
and Cubist shall be deemed Confidential Information and, as such, is subject to
the restrictions set forth in Article 6.

          (c)  Confirmation of Activity.  For a period of [               ]*
after the date upon which ArQule and Cubist exchange information about an Active
Compound pursuant to Section 3.3.(b) (the "Reservation Period"), ArQule will
reserve that Active Compound to the Collaboration. During the Reservation
Period, ArQule will provide Cubist with reasonable additional quantities of that
Active Compound and Cubist will perform secondary screens to confirm the
activity of that Active Compound. The Research Committee will coordinate these
confirmatory screening efforts.

 

*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.


                                      13
<PAGE>

          (d)  Designation of Collaboration Compounds.  At any time during the
Reservation Period, Cubist may request that the Research Committee designate the
relevant Active Compound as a Collaboration Compound under this Agreement. 
After receiving this request, the Research Committee will confirm that the
compound exhibits the requisite functional activity to qualify as an Active
Compound, whereupon the Research Committee shall designate the relevant Active
Compound as a Collaboration Compound under this Agreement. If the Research
Committee fails to designate an ArQule Compound as a Collaboration Compound,
then (i) Cubist shall have no rights with respect to that ArQule Compound and
(ii) ArQule shall have the right to license or otherwise commit such ArQule
Compound to a third party for any biological target and to include such ArQule
Compound in an ArQule internal discovery program for an unrelated biological
target, subject in both cases to the restrictions on Confidential Information
set forth in Article 6. If the Research Committee does designate an ArQule
Compound as a Collaboration Compound, then ArQule shall (i) internally designate
the Collaboration Compound as committed to Cubist under this Agreement, (ii)
remove the Collaboration Compound from future shipments of its Mapping Arrays,
and (iii) undertake no internal program on the Target for which that
Collaboration Compound exhibits activity.

          (e)  Termination of Mapping Array Program.  The Mapping Array Program
described in this Section 3.3. will commence on the Effective Date and will
continue during the term of this Agreement; provided that either party may
terminate the Mapping Array Program before the expiration or termination of this
Agreement with written notice to the other party which is received at least
sixty (60) days prior to any anniversary of the Effective Date.  In the event of
early termination, Cubist shall immediately cease primary screens of the Mapping
Array compounds but may (i) continue performing confirmatory screens of
previously identified Active Compounds and (ii) request that the Research
Committee designate any Active Compounds as Collaboration Compounds. all in
accordance with the terms of this Agreement.

     3.4. Conduct of Lead Optimization and Preclinical Development Activities.

          (a)  Approval and Initiation of Project.  At any time after an Active
Compound is identified, but no later than sixty (60) days after the relevant
Active Compound becomes a Collaboration Compound, the Research Committee may
approve a proposal for the Lead Optimization and Preclinical Development of one
or more Active Compounds for a Target.  The Research Committee shall forward
such proposals to the Steering Committee for approval. Once the Steering
Committee approves a proposal, the proposed 


                                     14
<PAGE>

research and development project shall automatically be designated a
Collaboration Project under this Agreement.  A Collaboration Project may be
initiated by the parties at any time after the relevant Active Compounds have
been designated as Collaboration Compounds by the Research Committee pursuant to
Subsection 3.3.(d). If the Research Committee or Steering Committee fails to
approve a proposed Lead Optimization or Preclinical Development project for one
or more Collaboration Compounds for a Target because of withdrawal of a party or
deadlock of the Steering Committee, the Collaboration Compound will be subject
to compulsory commercialization pursuant to Subsection 3.4.(h). If the Research
Committee or Steering Committee fails to approve a proposed Lead Optimization or
Preclinical Development project for one or more Collaboration Compounds for a
Target because of lack of business or scientific merit, the reversion provisions
set forth in Subsection 3.4.(i) shall automatically take effect unless otherwise
agreed by the parties.

          (b)  Preparation and Approval of Research Plan and Preclinical
Development Plan.  Promptly following initiation of a Collaboration Project, the
Research Committee shall prepare and submit to the Steering Committee (i) a
proposed Research Plan for Lead Optimization of the relevant Collaboration
Compounds to identify Preclinical Candidates and (ii) a preliminary Preclinical
Development Plan for the Preclinical Development of any Preclinical Candidates
that may be so identified.  Unless otherwise decided by the Research Committee,
the Research Plan shall provide that all Collaboration Compounds will be
submitted to a Directed Array Program for Lead Optimization.  The Steering
Committee must approve the proposed Research Plan and the preliminary
Preclinical Development Plan before the parties commence performance of the
Collaboration Project.  Before the parties commence any Preclinical Development
activities, the Steering Committee must approve a final Preclinical Development
Plan that is prepared and submitted by the Research Committee.  The Research
Committee will also prepare and submit to the Steering Committee any proposed
modifications to previously approved Research Plans and Preclinical Development
Plans.  No such modifications will take effect until approved by the Steering
Committee.

          (c)  Responsibilities for Project.  The parties intend that, in any
Collaboration Project, ArQule will have general responsibility for tasks
involving chemistry and Cubist will have general responsibility for tasks
involving biology.  However, the Research Committee will determine the actual
tasks of each party for each Collaboration Project in accordance with an
approved Research Plan or Preclinical Development Plan.  If the Research
Committee cannot agree upon the allocation of any task for a Collaboration
Project, the matter shall be decided by the Steering Committee.  If the 


                                     15
<PAGE>

Steering Committee cannot resolve the matter within sixty (60) days after the
Research Committee deadlocked, the tasks at issue will be performed by the party
that has general responsibility for that task, as described Exhibit A.

          (d)  Reports and Records.  Each party agrees to promptly and regularly
communicate to the other party all research results from a Collaboration
Project, including quarterly reports to the Research Committee detailing all
tests conducted and results obtained by such party in connection with a
Collaboration Project.  Each party shall prepare and maintain adequate records,
including bound laboratory notebooks maintained in accordance with standard
scientific procedures, containing all appropriate data reflecting all research
results from a Collaboration Project.  In addition, each party shall retain
under appropriate conditions any necessary or desirable samples of Research
Materials that are developed or used in a Collaboration Project.

          (e)  Designation of Additional Collaboration Compounds.  In the course
of a Collaboration Project, Cubist is likely to detect additional Active
Compounds for the relevant Target as it screens Directed Arrays derived from the
Collaboration Compounds.  After the Research Committee confirms that these
ArQule Compounds exhibit the requisite functional activity to qualify as Active
Compounds and ArQule confirms that the Active Compounds are Available Compounds,
the Research Committee will designate such Active Compounds as additional
Collaboration Compounds under this Agreement.

          (f)  Designation of Preclinical Candidates.  The Research Committee
shall monitor Lead Optimization activities in each Collaboration Project.  At
the discretion of the Research Committee, but prior to commencement of any
Preclinical Development activities for a Collaboration Project, the Research
Committee shall designate one or more Collaboration Compounds as Preclinical
Candidates for that Collaboration Project.  Thereafter, the Research Committee
shall have discretion to designate additional Collaboration Compounds as
Preclinical Candidates and to eliminate Collaboration Compounds as Preclinical. 
Candidates for that Collaboration Project as circumstances warrant.  The parties
shall designate a Preclinical Candidate before commencing Preclinical. 
Development activities with a Collaboration Compound in a Collaboration Project.

          (g)  Cross-Licenses for Lead Optimization and Preclinical Development.
The following license grants shall have effect only with respect to activities
undertaken in connection with and during the term of a Collaboration Project and
as approved by the Research Committee:
 
                                      16
<PAGE>


     (i)  ArQule hereby grants Cubist a worldwide, [            ]*, exclusive
          (except as to ArQule) license under the ArQule Patent Rights and other
          rights in ArQule Technology to perform Lead Optimization and
          Preclinical Development in the Field with any Collaboration Compound.

     (ii) Cubist hereby grants ArQule a worldwide, [            ]*, exclusive
          (except as to Cubist) license under the Cubist Patent Rights and other
          rights in Cubist Technology to perform Lead Optimization and
          Preclinical Development in the Field with any Collaboration Compound.

Each party acknowledges and agrees that these cross-licenses, while effective
for a Collaboration Compound, preclude any further license grants in the Field
by either party for that Collaboration Compound.  Neither party shall have the
right to sublicense the license grants set forth in this Section.  During the
term of a Collaboration Project, neither party shall grant any right or license
under the applicable Joint Patent Rights or other rights in Joint Technology to
any third party without the prior written consent of the other party.

          (h)  Withdrawal or Deadlock.  In the event that a party desires to
withdraw from a proposed or ongoing project for Lead Optimization or Preclinical
Development for one or more Collaboration Compounds for a Target, or if the
Steering Committee deadlocks regarding (i) approval of a proposed Lead
Optimization and Preclinical Development project pursuant to Subsection 3.4.(a)
or (ii) an issue that arises in an ongoing Collaboration Project, the parties
will immediately cease work on the Collaboration Project and attempt to
outlicense the work product of that Collaboration Project.  At the request of
either party, the parties will select a mutually acceptable technology broker
who shall have authority to license such work product on their behalf.  If the
parties cannot select a mutually acceptable technology broker within thirty (30)
days, each party will select a third party representative and these
representatives will select the technology broker.  If neither party desires to
use a technology broker, the parties will jointly market such work product and
jointly negotiate and execute any resulting license agreement.  [          ]*
will pay [                   ]* of any costs and expenses (including without
limitation brokers fees, attorneys fees, and travel expenses) incurred in
connection with any outlicensing activities under this Subsection, and
[          ]* will receive [                   ]* of any income resulting from
such license.  As an alternative to forced commercialization of such work 


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.


                                       17
<PAGE>

product, either party may make a buy-out offer to the other party at any time,
but the other party may reject any buy-out offer and seek to outlicense the work
product, in its sole discretion.

          (i)  Lack of Merit.  A Collaboration Project shall terminate
immediately in the event of a decision by the Research Committee or Steering
Committee to terminate the Collaboration Project for lack of scientific or
business merit.  In such event, the reversion provisions set forth below shall
automatically take effect unless otherwise agreed by the parties:

     (i)   Cubist shall have no further rights under the ArQule Patent Rights or
           ArQule Technology with respect to such Collaboration Compounds;

     (ii)  ArQule shall have no further rights under the Cubist Patent Rights or
           Cubist Technology with respect to such Collaboration Compounds;

     (iii) Cubist shall grant ArQule an exclusive, worldwide,
           [            ]* license (with the right to sublicense) under any 
           Joint Patent Rights and other rights in Joint Technology to the 
           extent applicable to the composition of such Collaboration Compounds,
           provided that ArQule shall not assert such rights against any Cubist
           Collaborator that discovers such Collaboration Compounds independent
           of any information (whether or not published) derived from either
           party or arising from the Collaboration;

     (iv)  ArQule retains the right to assert all ArQule Patent Rights and other
           rights in ArQule Technology against Cubist and any Cubist
           Collaborator;

     (v)   ArQule shall grant Cubist an exclusive, worldwide, [             ]*
           license (with the right to sublicense) under any Joint Patent Rights
           and other rights in Joint Technology to the extent applicable to the
           use of such Collaboration Compounds with the identified Targets,
           provided that Cubist shall not assert such rights against any ArQule
           Collaborator that discovered such use independent of any information
           (whether or not published) derived from either party or arising from
           the Collaboration; and


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.

                                      18
<PAGE>

     (vi)  Cubist retains the right to assert all Cubist Patent Rights and other
           rights in Cubist Technology against ArQule and any ArQule
           Collaborator.

Each party shall remain subject to the restrictions on Confidential Information
set forth in Article 6. Cubist acknowledges that ArQule shall have the right 
to [




               ]*  ArQule acknowledges that Cubist shall have the right (i) to
screen and develop compounds other than those Collaboration Compounds, and (ii)
to screen and develop those Collaboration Compounds if such compounds are
independently discovered by a third party who, on its own initiative, offered
those compounds to Cubist for use with the identified Target.

     3.5. Clinical Development of Collaboration Compounds.

          (a)  Designation of Clinical Candidate.  After approval of an IND for
a Preclinical Candidate, the Research Committee may designate that Preclinical
Candidate as a Clinical Candidate for the purposes of this Section 3.5. Neither
party will commence Clinical Development of any Collaboration Compound or
Derivative before such compound has been designated as a Clinical Candidate in
accordance with this Section.  The Steering Committee will develop a
Commercialization Plan for each Clinical Candidate.

          (b)  Co-Development Right.  Without further action, each party shall
have the co-exclusive right to conduct the Clinical Development, commercial
license, manufacture, distribution, marketing, and sale of any Clinical
Candidate.

          (c)  Authority.  The parties shall have joint responsibility for and
control over all activities for the Clinical Development and commercialization
of the relevant Clinical Candidate, in accordance with the Clinical Development
Plan and Commercialization Plan.  The Steering Committee shall decide whether to
proceed with each stage of Clinical Development and shall have oversight,
management, and approval authority for commercialization decisions, activities,
and agreements.  The Research Committee shall have oversight and management
authority for Clinical Development activities.  Unless otherwise agreed by the
parties, any grant of commercial rights 


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.

                                      19
<PAGE>

in a Clinical Candidate shall require the signatures of both parties to become
effective.

          (d)  Development Licenses.  The following license grants shall have
effect only with respect to activities approved by the Steering Committee and
undertaken in connection with the Clinical Development of the relevant Clinical
Candidate:

     (i)  ArQule hereby grants Cubist a worldwide, [               ]*, exclusive
          (except as to ArQule) license under the ArQule Patent Rights, Joint
          Patent Rights, and other rights in ArQule Technology and Joint
          Technology to perform Clinical Development of the Clinical Candidate.

     (ii) Cubist hereby grants ArQule a worldwide, [               ]*, exclusive
          (except as to Cubist) license under the Cubist Patent Rights, Joint
          Patent Rights, and other rights in Cubist Technology and Joint
          Technology to perform Clinical Development of the Clinical Candidate.

Each party acknowledges and agrees that these cross-licenses, while effective
for Clinical Candidate, preclude any further license grants in the Field by
either party for the Clinical Development of that Clinical Candidate.  Neither
party shall have the right to sublicense the license grants set forth in this
Subsection without the approval of the Research Committee or Steering Committee,
as appropriate.

          (e)  Withdrawal and Deadlock.  Each party shall have the right to
decline to participate in, or to withdraw from, Clinical Development activities
for a particular Clinical Candidate at any time upon sixty (60) days prior
written notice to the other party.  In such event, the relevant Collaboration
Project shall terminate upon the conclusion of the sixty-day notice period.  In
the event that the Steering Committee reaches deadlock on an issue that arises
in connection with Clinical Development or commercialization activities for a
particular Clinical Candidate, the Collaboration Project shall immediately
terminate.  If a Collaboration Project terminates due to withdrawal or deadlock
under this Section, the parties will immediately cease work on the Collaboration
Project and attempt to outlicense the work product of that Collaboration
Project.  At the request of either party, the parties will select a mutually
acceptable technology broker who shall have authority to license such work
product on their behalf.  If the parties cannot select a mutually acceptable
technology broker within thirty 


*    Confidential Treatment Requested:  material has been omitted and filed
     separately with the Commission.

                                      20
<PAGE>

(30) days, each party will select a third party representative and these
representatives will select the technology broker.  If neither party desires to
use a technology broker, the parties will jointly market such work product and
jointly negotiate and execute any resulting license agreement.  [          ]*
will pay [                   ]* of any direct costs and expenses (including
without limitation brokers fees, attorneys fees, and travel expenses) incurred
in connection with any outlicensing activities under this Subsection, and
[          ]* will receive [                   ]* of all proceeds resulting from
such license.  As an alternative to forced commercialization of such work
product, either party may make a buy-out offer to the other party at any time,
but the other party may reject any buy-out offer and seek to outlicense the work
product, in its sole discretion.

          (f)  Lack of Merit.  In the event of a decision by the Research
Committee or Steering Committee to terminate Clinical Development or
commercialization activities for a Clinical Candidate for lack of clinical or
business merit, the development licenses set forth in Subsection 3.5.(d) shall
automatically and immediately terminate and the reversion provisions set forth
below shall automatically take effect unless otherwise agreed by the parties:

     (i)  Cubist shall have no further rights under the ArQule Patent Rights or
          ArQule Technology with respect to such Clinical Candidate and all
          other Collaboration Compounds within that Collaboration Project;

     (ii) ArQule shall have no further rights under the Cubist Patent Rights or
          Cubist Technology with respect to such Clinical Candidate and all
          other Collaboration Compounds within that Collaboration Project;

    (iii) Cubist shall grant ArQule an exclusive, worldwide, [               ]*
          license (with the right to sublicense) under any Joint Patent Rights 
          and other rights in Joint Technology to the extent applicable to the 
          composition of such Clinical Candidate and all other Collaboration 
          Compounds within that Collaboration Project, provided that ArQule 
          shall not assert such rights against any Cubist Collaborator that 
          discovers such Collaboration Compounds independent of any information
          (whether or not published) derived from either party or arising from 
          the Collaboration;


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.


                                      21
<PAGE>

     (iv) ArQule retains the right to assert all ArQule Patent Rights and other
          rights in ArQule Technology against Cubist and any Cubist
          Collaborator;

     (v)  ArQule shall grant Cubist an exclusive, worldwide, [               ]*
          license (with the right to sublicense) under any Joint Patent Rights
          and other rights in Joint Technology to the extent applicable to the
          use of such Clinical Candidate and all other Collaboration Compounds
          within that Collaboration Project with the identified Targets,
          provided that Cubist shall not assert such rights against any ArQule
          Collaborator that discovered such use independent of any information
          (whether or not published) derived from either party or arising from
          the Collaboration; and

     (vi) Cubist retains the right to assert all Cubist Patent Rights and other
          rights in Cubist Technology against ArQule and any ArQule
          Collaborator.

Each party shall remain subject to the restrictions on Confidential Information
set forth in Article 6. Cubist acknowledges that ArQule shall have the right [




                                        ]*  ArQule acknowledges that Cubist
shall have the right (i) to screen and develop compounds other than the
Collaboration Compounds within the terminated Collaboration Project, and (ii) to
screen and develop those Collaboration Compounds if such compounds are
independently discovered by a third party who, on its own initiative, offered
those compounds to Cubist for use with the identified Target.

4.   Ownership and Management of Intellectual Property.

    4.1.  Intellectual Property Developed Outside of Collaboration.  Except as
expressly set forth in this Agreement, neither party shall have any rights in
Patent Rights and Technology that is developed or discovered by the other party
prior to the Effective Date or outside of the Collaboration.  For example,
Cubist shall have sole ownership of all right, title, and interest in Targets
and other Cubist Proprietary Research Materials, and ArQule shall 


*    Confidential Treatment Requested:  material has been omitted and filed
     separately with the Commission.

                                     22
<PAGE>

have sole ownership of all right, title, and interest in ArQule Compounds
provided to Cubist in the Mapping Array Program.  Each party shall have sole
responsibility for and control over Patent Rights claiming any of its Technology
that was developed or discovered prior to the Effective Date or outside of the
Collaboration.  Neither party shall have any right to review and comment on such
Patent Rights of the other party.

    4.2.  Ownership of Intellectual Property Arising From the Collaboration. 
Ownership of Patent Rights and Technology arising from the Collaboration shall
be allocated in the following manner:

     [
      

     
     

     
                                   ]*

Each party shall ensure that its employees, consultants, agents, and
representatives are contractually required to assign to such party all Patent
Rights and other rights in Technology arising from the Collaboration and to
promptly disclose to such party all patentable inventions within that
Technology.

     4.3. Notice of Intellectual property Arising From the Collaboration.  Each
party shall provide prompt written notice to the Research Committee of the
internal disclosure of any significant Technology developed by its personnel in
connection with the Collaboration.

     4.4. Responsibility for Patent Rights Arising from the Collaboration. 
ArQule shall be responsible for and shall control, [        ]*, the preparation,
filing, prosecution, grant, and maintenance of any Patent Rights claiming only
ArQule Technology and shall consult with Cubist on, and give Cubist a reasonable
opportunity to review, all such filings to the extent they directly relate to
the Collaboration.  Cubist shall be responsible for and shall control,
[        ]* the preparation, filing, prosecution, grant, and maintenance of all
Patent Rights claiming only Cubist Technology and shall consult with ArQule on,
and give ArQule a reasonable opportunity to review, 


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.

                                     23

<PAGE>

all such filings to the extent they relate directly to the Collaboration.  In
the case of Joint Technology, the Research Committee will decide whether to seek
Joint Patent Rights claiming that Technology or to maintain that Technology as a
trade secret.  The Research Committee will also decide whether to seek Patent
Rights claiming both ArQule Technology and Cubist Technology in one filing,
which also constitutes a Joint Patent Right.  If the Research Committee decides
to seek any Joint Patent Rights, the parties shall jointly prepare, file,
prosecute, and maintain such Patent Rights, and all related expenses shall
become equally by the parties.  Notwithstanding the foregoing, neither party
shall file any Joint Patent Rights claiming the composition or use of any Active
Compound in a Mapping Array until the Research Committee has properly designated
that Active Compound as a Collaboration Compound in accordance with Subsection
3.3.(d) or 3.4.(e).

     4.5. Assumption of Rights by Other Party.  In the event that a party
desires to decline responsibility for obtaining or maintaining Patent Rights in
a country for any of its Technology that is developed or discovered in
connection with the Collaboration, such party will notify the other party before
taking such action and, upon request, will allow the other party to assume
responsibility for, and all expenses relating to, the relevant Patent Rights in
those countries; provided, however, that neither party shall have the right to
seek patent protection for any Technology that a party has decided, in its
discretion, to maintain as a trade secret.  In the event that a party desires to
cease further payment of patent-related expenses for a Joint Patent Right in any
country, such party may assign to the other party all rights in that Joint
Patent Right in such country and thereafter have no further obligation to pay
such expenses.

     4.6. Cooperation.  Each party agrees to cooperate fully in the preparation,
filing, prosecution, and maintenance of all Patent Rights claiming Technology
arising from the Collaboration.  Such cooperation includes, without limitation,
(i) promptly executing all papers and instruments, or requiring its employees,
consultants, and agents to execute such papers and instruments, as reasonable
and appropriate so as to enable one or both parties to file, prosecute, and
maintain such Patent Rights in any country; (ii) promptly informing the other
party of matters that may affect the preparation, filing, prosecution, or
maintenance of any such Patent Rights; and (iii) undertaking no actions that are
potentially deleterious to the preparation, filing, or prosecution of any such
Patent Rights.

     4.7. Abandonment of Joint Patent Rights.  In the event that the parties
fail to complete a Collaboration Project due to lack of merit pursuant to
Subsection 3.4.(i), the parties shall discuss in good faith 

                                      24
<PAGE>


whether to abandon any unpublished patent applications within the Joint Patent
Rights relating to that Collaboration Project.  The parties recognize that
publication of such Joint Patent Rights could adversely affect each of their
interests after reversion occurs under Subsection 3.4.(i).

5.   Research Materials.

     5.1. Ownership of Research Materials.  In the course of this Collaboration,
one party (the "Provider") may transfer to the other party (the "Recipient")
certain of its Research Materials.  The Recipient acknowledges and agrees that
such Research Materials are and shall be owned by the Provider.  The Recipient
agrees to execute and deliver any documents of assignment or conveyance to
effectuate the ownership rights of the Provider in such Research Materials.  [
     
     
     
     
          ]*

     5.2. Use and Transfer of Research Materials.  Except as otherwise agreed by
the Research Committee, the Recipient agrees to use Research Materials provided
by the Provider solely for purposes set forth in this Agreement and shall not
distribute such Research Materials to any third party other than its employees
and consultants who are working on the Collaboration.

     5.3. Additional Restrictions for Property Research Materials.  In the case
of Proprietary Research Materials furnished by a Provider, Recipient agrees (i)
not to transfer such Proprietary Research Materials to any third party without
the prior written consent of the Provider, (ii) to permit access to the
Proprietary Research Materials only to its employees and consultants requiring
such access, (iii) to inform such employees and consultants of the proprietary
nature of the Proprietary Research Materials, and (iv) to take reasonable
precautions, at least as stringent as those observed by Recipient to protect its
own proprietary materials, to ensure that such employees and consultants observe
the obligations of Recipient under this Section.

     5.4. Disposition of Unused Research Materials.  At the request of Provider,
Recipient will return or destroy any unused Research Materials furnished by
Provider.


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.


                                      25
<PAGE>


     5.5. Compliance with Law.  Recipient agrees to comply with all federal,
state, and local laws and regulations applicable to the use, storage, disposal,
and transfer of Research Materials furnished by Provider, including without
limitation the Toxic Substances Control Act (15 USC 2601 et seq.) and
implementing regulations (in particular, 40 CFR 720.36 [Research and Development
Exemption]), the Food, Drug, and Cosmetic Act (21 USC 301 g et seq.) and
implementing regulations, and all Export Administration Regulations of the
Department of Commerce.  Recipient assumes sole responsibility for any violation
of such laws or regulations by Recipient or any of its Affiliates or
Sublicensees.

     5.6. Limitation of Liability.  Any Research Materials delivered pursuant to
this Agreement are understood to be experimental in nature and may have
hazardous properties. Recipient should assume that the compounds are dangerous
and should use appropriate precautions.  [





                                             .]*

6.   Confidential Information.

     6.1. Designation of Confidential Information.  Confidential Information
that is disclosed in writing shall be marked with a legend indicating its
confidential status.  Confidential Information that is disclosed orally or
visually shall be documented in a written notice prepared by the Disclosing
Party and delivered to the Receiving Party within thirty (30) days of the date
of disclosure; such notice shall summarize the Confidential Information
disclosed to the Receiving Party and reference the time and place of disclosure.

     6.2. Obligations of Receiving Party.  The Receiving Party agrees that it
     shall:

     (i)  maintain all Confidential Information in strict confidence, except
          that the Receiving Party may disclose or permit the disclosure of any
          Confidential Information to its directors, officers, employees,
          consultants, and advisors who are obligated to maintain the
          confidential nature of such Confidential 


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.

                                      26
<PAGE>


          Information and who need to know such Confidential Information for the
          purposes set forth in this Agreement;

     (ii) use all Confidential Information solely for the purposes of this
          Agreement; and

    (iii) allow its directors, officers, employees, consultants, and advisors to
          reproduce the Confidential Information only to the extent necessary 
          to effect the purposes set forth in this Agreement, with all such
          reproductions being considered Confidential Information,

     6.3. Exceptions.  The obligations of the Receiving Party under Section 6.2.
above shall not apply to the extent that the Receiving Party can demonstrate
that certain Confidential Information:

     (i)  was in the public domain prior to the time of its disclosure under
          this Agreement;

     (ii) entered the public domain after the time of its disclosure under this
          Agreement through means other than an unauthorized disclosure
          resulting from an act or omission by the Receiving Party;

    (iii) was independently developed or discovered by the Receiving Party
          without use of the Confidential Information;

     (iv) is or was disclosed to the Receiving Party at any time, whether prior
          to or after the time of its disclosure under this Agreement, by a
          third party having no fiduciary relationship with the Disclosing Party
          and having no obligation of confidentiality to the Disclosing Party
          with respect to such Confidential Information; or

     (v)  is required to be disclosed to comply with applicable laws or
          regulations (such as disclosure to the FDA or the United States Patent
          and Trademark Office or to their foreign equivalents), or to comply
          with a court or administrative order, provided that the Disclosing
          Party receives prior written notice of such disclosure and that the
          Receiving Party takes all reasonable and lawful actions to obtain
          confidential treatment for such disclosure and, if possible, to
          minimize the extent of such disclosure.


                                      27
<PAGE>



     6.4. Return of Confidential Information.  Upon the termination of this
Agreement, or earlier at the request of the Disclosing Party, the Receiving
Party shall return to the Disclosing Party all originals, copies, and summaries
of documents, materials, and other tangible manifestations of Confidential
Information in the possession or control of the Receiving Party, except that the
Receiving Party may retain one copy of the Confidential Information in the
possession of its legal counsel solely for the purpose of monitoring its
obligations under this Agreement.

     6.5. Survival of Obligations.  The obligations set forth in this Article
shall remain in effect for an item of Confidential Information for a period of
ten (10) years after the date upon which a Receiving Party first received that
Confidential Information, except that the obligation of the Receiving Party to
return Confidential Information to the Disclosing Party shall survive until
fulfilled.

7.   Indemnification and Insurance.

     7.1. General Indemnification.  [          ]* (the "Indemnifying Party")
shall indemnify and hold harmless the other party, its Affiliates, and their
respective directors, officers, employees and agents (collectively, the
"Indemnitees ") from and against all claims, expenses or liability of whatever
nature arising from any default, act, omission or negligence of the Indemnifying
Party, its agents or employees, or others exercising rights by, through, or
under the Indemnifying Party, or the failure of the Indemnifying Party or such
persons to comply with any applicable laws, rules, regulations, codes,
ordinances or directives of governmental authorities, in each case to the extent
the same are related, directly or indirectly, to the Collaboration described
herein; provided, however, that in no event shall the Indemnifying Party be
obligated under this section to indemnify the Indemnitees where such claim,
expense or liability results solely from any omission, fault, negligence, or
other misconduct of any of the Indemnitees.

     7.2. Procedure.  The Indemnitees agree to provide the Indemnifying Party
with prompt written notice of any claim, suit, action, demand, or judgment for
which indemnification is sought under this Agreement.  If an Indemnitee fails to
provide such notice within a reasonable time, and if such failure prejudicially
affects the ability of the Indemnifying Party to defend such action, the
Indemnifying Party shall be relieved of its liability to such Indemnitee under
this Article 7. The Indemnifying Party agrees, at its own expense, to provide
attorneys reasonably acceptable to the Indemnitees to 


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.

                                      28
<PAGE>

defend against any such claim.  The Indemnitees shall cooperate fully with the
Indemnifying Party in such defense and will permit the Indemnifying Party to
conduct and control such defense and the disposition of such claim, suit, or
action (including all decisions relative to litigation, appeal, and settlement);
provided, however, that any Indenmitee shall have the right to retain its own
counsel, at the expense of the Indemnifying Party, if representation of such
Indemnitee by the counsel retained by the Indemnifying Party would be
inappropriate because of actual or potential differences in the interests of
such Indemnitee and any other party represented by such counsel.  The
Indemnifying Party agrees to keep the other party informed of the progress in
the defense and disposition of such claim and to consult with such party with
regard to any proposed settlement.

8.   Term and Termination.

     8.1. Term.  This Agreement shall commence on the Effective Date and shall
continue for a period of ten (10) years unless earlier terminated pursuant to
this Article 8.

     8.2. Voluntary Termination.  At any time on or after the first anniversary
of the Effective Date, either party may terminate this Agreement immediately
upon [                                       ]* notice to the other party.

     8.3. Termination for Default.  In the event that either party commits a
material breach of its obligations under this Agreement and fails to cure that
breach within [            ]* days after receiving written notice thereof, the
other party may terminate this Agreement [                        ]* notice to 
the party in breach.

     8.4. Termination for Deadlock.  In the event of a deadlock in the Steering
Committee on a matter that affects the Agreement as a whole, as described in
Subsection 2.2.(f), either party may terminate this Agreement
[                          ]* notice to the other party.

     8.5. Force Majeure.  Neither party will be responsible for delays resulting
from acts beyond the control of such party, provided that the nonperforming
party uses commercially reasonable efforts to avoid or remove such causes of
nonperformance and continues performance hereunder with reasonable dispatch
whenever such causes are removed.


*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.


                                      29
<PAGE>


     8.6. Effect of Termination.  Except as otherwise agreed by the parties,
upon the expiration or termination of this Agreement, the provisions of
Subsections 3.3.(e), 3.4.(h), and 3.5.(c) shall immediately apply to all ongoing
activities of the Collaboration and the other provisions of this Agreement shall
immediately terminate, except that the following provisions shall survive:
Articles 4, 5, 6, 7, and 9; Sections 8.6., 10.1, 10.7., and 10.9.

9.   Dispute Resolution.

     9.1. Procedures Mandatory.  The parties agree that any dispute arising out
of or relating to this Agreement shall be resolved solely by means of the
procedures set forth in this Article, and that such procedures constitute
legally binding obligations that are an essential provision of this Agreement;
provided, however, that all procedures and deadlines specified in this Article
may be modified by written agreement of the parties.  If either party fails to
observe the procedures of this Article, as modified by their written agreement,
the other party may bring an action for specific performance in any court of
competent jurisdiction.

     9.2. Dispute Resolution Procedures.

          (a)  Negotiation.  In the event of any dispute arising out of or
relating to this Agreement, the affected party shall notify the other party, and
the parties shall attempt in good faith to resolve the matter within ten (10)
days after the date such notice is received by the other party (the "Notice
Date").  Any disputes not resolved by good faith discussions shall be referred
to the Steering Committee, which shall meet at a mutually acceptable time and
location within thirty (30) days after the Notice Date and attempt to negotiate
a settlement.

     (b)  Mediation.  If the matter remains unresolved within sixty (60) days
after the Notice Date, or if the Steering Committee fails to meet within thirty
(30) days after the Notice Date, either party may initiate mediation upon
written notice to the other party, whereupon both parties shall be obligated to
engage in a mediation proceeding under the then current Center for Public
Resources ("CPR") Model Procedure for Mediation of Business Disputes, except
that specific provisions of this Section shall override inconsistent provisions
of the CPR Model Procedure. The mediator will be selected from the CPR Panels
of Neutrals. If the parties cannot agree upon the selection of a mediator
within ninety (90) days after the Notice Date, then upon the request of either
party, the CPR shall appoint the mediator. The parties shall attempt to resolve
the dispute through mediation until one of the following occurs: (i) the parties
reach a written settlement; (ii) the mediator notifies the parties in writing
that they have reached an impasse; 

                                      30
<PAGE>

(iii) the parties agree in writing that they have reached an impasse; or (iv)
the parties have not reached a settlement within one hundred and twenty (120)
days after the Notice Date.

          (c)  [                .]*  If the parties fail to resolve the dispute
through mediation, or if neither party elects to initiate mediation, each party
shall have the right to pursue any other remedies legally available to resolve
the dispute, [
                         .]*

     9.3. Preservation of Rights Pending Resolution.

          (a)  Performance to Continue.  Each party shall continue to perform
its obligations under this Agreement pending final resolution of any dispute
arising out or relating to this Agreement; provided, however, that a party may
suspend performance of its obligations during any period in which the other
party fails or refuses to perform its obligations.

          (b)  Provisional Remedies.  [
          
                                   ]* either party may seek a preliminary
injunction or other provisional equitable relief if, in its reasonable judgment,
such action is necessary to avoid irreparable harm to itself or to preserve its
rights under this Agreement.

          (c)  Statute of Limitations.  The parties agree that all applicable
statutes of limitation and time-based defenses (such as estoppel and laches)
shall be tolled while the procedures set forth in Subsections 9.2.(a) and 9.2(b)
are pending.  The parties shall take any actions necessary to effectuate this
result.

10.  Miscellaneous.

     10.1.  Publicity.  No press release, advertising, promotional sales
literature, or other promotional oral or written statements to the public in
connection with or alluding to work performed under this Agreement or the
relationship between the parties created by it, having or containing any
reference to ArQule or Cubist, shall be made by either party without the prior
written approval of the other party, except for restatements of
previously-approved statements and disclosures required by applicable law or
regulation.

*  Confidential Treatment Requested:  material has been omitted and filed
   separately with the Commission.

                                      31
<PAGE>

     10.2.  Relationship of Parties.  For the purposes of this Agreement,
each party is an independent contractor and not an agent or employee of the
other party.  Neither party shall have authority to make any statements,
representations, or commitments of any kind, or to take any action which shall
be binding on the other party, except as may be explicitly provided for herein
or authorized in writing.

     10.3.  Counterparts.  This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, and all of which
together shall be deemed to be one and the same instrument.

     10.4.  Headings.  All headings in this Agreement are for convenience
only and shall not affect the meaning of any provision hereof,

     10.5.  Binding Effect.  This Agreement shall inure to the benefit of and
be binding upon the parties and their respective lawful successors and assigns.

     10.6.  Assignment.  This Agreement may not be assigned by either party
without the prior written consent of the other party, except that either of the
parties may assign this Agreement to a successor in connection with the merger,
consolidation, or sale of all or substantially all of its assets or that portion
of its business pertaining to the subject matter of this Agreement.

     10.7.  Notices.  All notices, requests, demands and other communications
required or permitted to be given pursuant to this Agreement shall be in writing
and shall be deemed to have been duly given upon the date of receipt if
delivered by hand, recognized national overnight courier, confirmed facsimile
transmission, or registered or certified mail, return receipt requested, postage
prepaid, to the following addresses or facsimile numbers:

If to Cubist:

                    Cubist Pharmaceuticals, Inc.
                    24 Emily Street
                    Cambridge, MA 02139
                    Attn:  Scott M. Rocklage, President
                    Tel:  (617) 576-1999
                    Fax:  (617) 576-0232


                                      32
<PAGE>

If to ArQule:

                    ArQule, Inc.
                    200 Boston Avenue
                    Medford, MA 02155
                    Attn:  Eric B. Gordon, President
                    Tel:  (617) 395-4100
                    Fax:  (617) 395-1225

with a copy (which shall not constitute notice) to:

                    Palmer & Dodge
                    One Beacon Street
                    Boston, MA 02108
                    Attn:  Michael Lytton, Esq.
                    Tel:  (617) 573-0327
                    Fax:  (617) 227-4420

Either party may change its designated address and facsimile number by notice to
the other party in the manner provided in this Section.

     10.8.  Amendment and Waiver.  This Agreement may be amended,
supplemented, or otherwise modified at any time, but only by means of a written
instrument signed by both parties.  Any waiver of any rights or failure to act
in a specific instance shall relate only to such instance and shall not be
construed as an agreement to waive any rights or fail to act in any other
instance, whether or not similar.

     10.9.  Governing Law.  This Agreement and the legal relations among the
parties shall be governed by and construed in accordance with the laws of the
Commonwealth of Massachusetts irrespective of any conflict of laws principles.

     10.10. Severability.  In the event that any provision of this Agreement
shall, for any reason, be held to be invalid or unenforceable in any respect,
such invalidity or unenforceability shall not affect any other provision hereof,
and this Agreement shall be construed as if such invalid or unenforceable
provision had not been included herein.

     10.11. Entire Agreement.  This Agreement constitutes the entire agreement
between the parties with respect to the subject matter hereof and supersedes any
and all prior or contemporaneous oral and prior written agreements and
understandings including, without limitation, a certain 


                                     33
<PAGE>

Material Transfer and Screening Agreement dated June 4, 1996 between the
parties.

     IN WITNESS WHEREOF, the undersigned have duly executed and delivered this
Agreement as a sealed instrument effective as of the date first above written.

                    CUBIST PHARMACEUTICALS, INC.
                    
                    
                    
                    By:  /s/ Mark Carthy
                       -----------------------------------------------
                         Mark Carthy
                         Vice President and Chief Business Officer
                    
                    ARQULE, INC.
                    
                    By:  /s/ Eric B. Gordon
                       -----------------------------------------------
                         Eric B. Gordon,
                         President and Chief Executive Officer



                                      34