Document:

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                                                                  EXHIBIT 10.26

                              CONSULTING AGREEMENT

This CONSULTING AGREEMENT, made the 12th day of December 2000 is between
PHARMACOPEIA INC. ("PCOP"), a Delaware corporation having a place of business at
3000 Eastpark Blvd., Cranbury, NJ 08512 and RICHARD WALSH ("Consultant"),
located at 49 Benedict Crescent, Denville, New Jersey 07834.

In order to have available Consultant's knowledge, experience, and advice
relative to certain research, product development and/or marketing activities of
PCOP, and in exchange for good and valuable consideration, PCOP and Consultant
hereby agree as follows:

1.   SERVICES: Consultant agrees to perform such consulting, advisory, and
     related services to and for PCOP as may reasonably be requested from time
     to time by PCOP, including, but not limited to, the services specified in
     Attachment A to this Agreement.

2.   TERM: This Agreement is effective as of January 1, 2001 and will continue
     until June 30, 2001 unless otherwise extended (such period is referred to
     as the "Consultation Period"), or until either Consultant or PCOP notifies
     the other in writing of his or its desire to terminate the Consultation
     Period in accordance with the provisions of Section 10.

3.   SERVICE MINIMUMS: During the consultation period of this Agreement and
     subject to the termination provisions of Section 10, PCOP will provide the
     Consultant with the opportunity to perform an average of no less than eight
     (8) full days of consulting services each month for the first three months
     and an average of no less than six (6) full days of consulting services
     during the second three months. Consultant will provide reasonable
     additional amounts of Consulting services as agreed to by Consultant and
     PCOP, subject to the provisions of Section 9.

4.   LOCATION: Consultant's services under this Agreement shall be rendered at
     such times and at such places as will be mutually satisfactory to
     Consultant and PCOP.

5.   INDEPENDENT CONTRACTOR STATUS: Consultant shall perform all services under
     this Agreement as an "Independent Contractor" and not as an employee or
     agent of PCOP. Consultant is not authorized to assume or create any
     obligation or responsibility, express or implied, on behalf of, or in the
     name of, PCOP or to bind PCOP in any manner.

6.   INVENTIONS: Consultant agrees that all inventions, designs, specifications,
     drawings, copyrightable materials, computer programs or code, derivative
     works, processes, techniques, or know-how, (collectively referred to as
     "Inventions"), whether or not patentable, which are conceived, made or
     first reduced to practice by Consultant, individually or jointly with
     others, at any time during the term of this Agreement (or thereafter if
     resulting or directly derived from Proprietary Information as defined
     below) in conjunction with Consultant's work for PCOP, shall be the sole
     property of PCOP, and Consultant hereby transfers to PCOP all right, title
     and interest in and to such Inventions. At PCOP's request, Consultant shall
     execute such instruments and take such further actions as may be
     appropriate to give full legal effect to this Section 6.

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7.   PROPRIETARY INFORMATION:

     (a)  Consultant acknowledges that his relationship with PCOP is one of high
          trust and confidence and that in the course of his service to PCOP he
          will have access and contact with proprietary, trade secret
          information of PCOP ("Proprietary Information"). Such Proprietary
          Information relates to PCOP's present and planned business, products,
          services and technological information. Consultant agrees and affirms
          his obligation that during the term of this Agreement and for a period
          of five (5) years thereafter he will not use, except for the benefit
          of PCOP, publish, or otherwise disclose in any way to any person, firm
          or corporation any Proprietary Information of PCOP.

     (b)  The above restriction will not apply to any information that (i) is
          rightfully known to or in the rightful possession of Consultant as of
          the date of its disclosure by PCOP, (ii) is generally distributed or
          made available to others by PCOP (without obligation of
          confidentiality) following the date of its disclosure to Consultant,
          or (iii) lawfully becomes known or available to the Consultant from
          third parties who are not under an obligation of confidentiality,
          directly or indirectly, with PCOP.

     (c)  Consultant further agrees that upon request by PCOP he will: (i)
          promptly return to PCOP the originals and all copies of tangible
          Proprietary Information furnished to or otherwise obtained by him; and
          (ii) destroy all notes and copies thereof made by him that contain
          partial or complete copies of the Proprietary Information or material
          derived from the Proprietary Information; and (iii) cause all of
          Consultant's agents and/or representatives to whom the Proprietary
          Information has been disclosed to comply with clauses (i) and (ii) of
          this Section 6(c).

8.   INDEMNIFICATION: Consultant represents that the performance of his services
     under the terms of this Agreement will not breach any agreement by which
     Consultant is bound, including without limitation the obligation to
     maintain as confidential any information acquired by Consultant prior to
     Consultant's term of consultancy with PCOP. Consultant further agrees to
     indemnify PCOP from any and all loss or liability incurred by reason of the
     alleged breach by Consultant of any such prior agreements.

9.   COMPENSATION:

     (a)  In consideration of the foregoing, PCOP hereby agrees to pay
          Consultant at the rate of $2,000.00 for each full day worked as
          defined by an average 8-hour period and a rate of $250 per hour
          worked. Partial workdays will be paid at the rate of $250 per hour if
          such workday is less than six (6) hours. Workdays in excess of eleven
          (11) hours will be paid at the full workday rate plus $250 per hour in
          excess of eleven (11) hours. The total fees due Consultant under this
          Agreement shall not exceed $75,000.00 over any given 3-month period,
          unless otherwise agreed to in writing by both parties.

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     (b)  PCOP shall reimburse Consultant for reasonable and necessary expenses
          incurred or paid by Consultant in connection with or related to the
          performance of the services under this Agreement. Consultant shall not
          incur expenses in excess of $1,000 in any one month without the
          express prior written approval of PCOP.

     (c)  Consultant shall invoice PCOP once after the end of each calendar
          month for all services performed under this Agreement. Invoices shall
          be due and payable upon receipt by PCOP.

     (d)  Consultant shall not be entitled to any benefits, coverage, or
          privileges, including, without limitation, social security,
          unemployment, medical or pension payments, made to employees of PCOP.

10.  TERMINATION: Either party may terminate the Consultation Period upon 30
     days written notice to the other party. In the event of such termination,
     Consultant shall be entitled to payment for services performed, taking into
     account the service minimum of Paragraph 3, and expenses paid or incurred
     prior to the effective date of termination. The provisions of Sections 6,
     7, 8, 10 and 13 shall survive any termination of the Consultation Period or
     termination of this Agreement.

11.  INCORPORATION: PCOP acknowledges that Consultant intends to form a
     Corporation ("Walsh Corp.") in January 2001 and that all rights and
     obligation of Consultant under this Agreement will be transferred to Walsh
     Corp. with all services hereunder to be performed by Consultant.

12.  ENTIRE AGREEMENT: This Agreement and Attachment A contain the entire
     agreement between Consultant and PCOP relating to Consultant's services to
     PCOP. No amendment or modification of this Agreement shall be deemed
     effective unless and until executed in writing by the parties hereto. This
     Agreement contemplates unique personal services and shall not be assignable
     by Consultant, except as provided in Section 11.

13.  GOVERNING LAW: This Agreement shall be construed, interpreted and enforced
     in accordance with the laws of the state of New Jersey. If any provision of
     this Agreement shall, to any extent be found to be invalid or
     unenforceable, the remainder of this Agreement shall not be affected
     thereby, and any such invalid or unenforceable provision shall be reformed
     so as to be valid and enforceable to the full extent permitted by law.

EXECUTED AND AGREED by the parties hereto as of the date first above written.

CONSULTANT                                          PHARMACOPEIA, INC.

By:  /S/  RICHARD J. WALSH                          By:  /S/ STEPHEN A. SPEARMAN
   ---------------------------------                   -------------------------

Name:  Richard J. Walsh                             Name:  STEPHEN A. SPEARMAN
                                                         ---------------------

Title:  President                                   Title:  EXEC. VICE PRESIDENT
                                                          ----------------------

Date:  DECEMBER 13, 2000                            Date:  DECEMBER 13, 2000
     -------------------------------                     -------------------

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                                  ATTACHMENT A

                               CONSULTING SERVICES

Consultant shall provide services, including but not limited to those outlined
below:

-    Provide general management consulting for the Drug Discovery Services
     business

-    Provide analysis of market for drug discovery products

-    Determine relative strengths and weaknesses of current business
     organization

-    Provide analysis on current and future customer prospects

-    Participate in the identification of potential customers, negotiations of
     contracts and closing of agreements; specific concentration on agreements
     with AHP, Aventis, and Schering-Plough

-    Provide appropriate support and introductions for business opportunities in
     Japan<PAGE>

                                                                   Exhibit 10.27

                              CONSULTING AGREEMENT
                           FOR FOUNDING MEMBERS OF THE
                               PHARMACOPEIA, INC.
                            SCIENTIFIC ADVISORY BOARD

                  This Agreement is made as of March ___, 1993, between
PharmaCopeia, Inc. (the "Company") and Paul A. Bartlett (the "Consultant") and
shall be effective upon execution by the Consultant (the "Effective Date").

                  The Consultant has been involved in scientific research in
fields of particular interest to the Company. The Company wishes to retain the
Consultant in a consulting capacity as a founding member of the Company's
Scientific Advisory Board, and the Consultant desires to perform such consulting
services. Accordingly, the parties agree as follows:

                  1.       SERVICES.

                           1.1.     The Consultant will advise the Company's
management, employees and agents, at reasonable times, in matters related to the
Company's field of interest, as requested by the Company as set forth below. The
Company's principal field of interest is the design and development of
pharmaceuticals utilizing state of the art methodologies in synthetic organic
and medicinal chemistry and related areas, including but not limited to the
generation and use of combinatorial chemical libraries (the "Company's Field of
Interest"). The Company's Field of Interest and area of consultation are
collectively referred to in this Agreement as the "Designated Field." In
addition, the Consultant shall assist the Company with development of its
general scientific direction and strategy, recruitment of full-time scientific
and management personnel, interactions with stockholders, potential inventors,
and potential strategic or corporate partners of the Company, and identification
of new inventions and technologies in the Designated Field.

                           1.2.     Consultant will provide up to 25 full days
of consulting per year (such days are referred to below as "Consulting Days").
Consultation may be sought by the Company over the telephone, in person at the
Consultant's office, at the Company's offices or another reasonable location (it
is anticipated that 10 days shall be at the Company's offices) or through
written correspondence, and will involve reviewing activities and developments
in the Company's Field of Interest. If the Company requests additional
consulting days, the Consultant will be paid a fee for each additional day as
set forth below. The Consultant also will participate as a founding member of
the Company's Scientific Advisory Board and agrees to use his best efforts to
attend Scientific Advisory Board meetings. Time spent at Scientific Advisory
Board meetings will be considered to be Consulting Days.

                  2.       CASH COMPENSATION. The Consultant will be paid an
annual fee of $75,000 per year starting as of the date of the Company's first
official Scientific Advisory Board meeting (the "Commencement Date"), and $1,000
for each Consulting Day in excess of 25 full days per year. Consultant shall not
be entitled to any fees for any services rendered to the

<PAGE>

Company prior to the Commencement Date. The annual fee shall be paid in four
equal quarterly installments in advance on the first day of each calendar
quarter; except for the first installment, which shall cover the remaining term
of the calendar quarter in which the Commencement Date occurs and be paid pro
rata based on the number of days remaining in such quarter. Any fee for excess
Consulting Days will be paid at the end of the relevant quarter. Reasonable
expenses of the Consultant incurred at the request of the Company will be
reimbursed promptly by the Company, subject to customary verification.

                  3.       STOCK.

                           3.1.     Promptly after execution of this Agreement,
the Consultant will be offered the opportunity to purchase 275,000 shares of the
Company's Common Stock (the "Stock") at the founder stock price of $.001/share
as set forth below.

                           3.2.     The Stock will be issued pursuant to the
Company's standard form of Restricted Stock Purchase Agreement providing that
the Stock will vest 25% immediately with the 75% remaining balance vesting
monthly over a four-year period commencing as of March 1, 1993 based upon
continued service to the Company as a Consultant (any unvested Stock may be
repurchased by the Company at a price equal to the original purchase price) and
containing certain other restrictions prohibiting transfer of the Stock for
specific time periods, provided that in the event that Consultant's consulting
services are involuntarily terminated by the Company without cause, an
additional 50% of the unvested shares as of the date of such termination shall
vest.

                  4.       TERM. The term of this Agreement will begin on the
Effective Date of this Agreement and will end at the end of the calendar quarter
in which the fourth anniversary of this Agreement occurs or upon earlier
termination as provided below (the "Term"). This Agreement may be terminated at
an earlier time prior to the fourth anniversary hereof by either party with at
least 30 days written notice. The Term will be automatically renewed for
successive one-year periods, unless either party provides written notice at
least thirty (30) days prior to the end of the Term that such party does not
wish to renew this Agreement. Upon termination, all accrued payments will be
made and, regardless of quarter, the unpaid portion of the annual fee will be
paid in proportion to the portion of the Consulting Day commitments set forth in
Section 1.2 that has been provided.

                  5.       CERTAIN OTHER CONTRACTS.

                           5.1.     The Consultant is currently employed by an
academic or research institution (the "Institution"). The Company recognizes
that the Consultant's primary responsibility is to the Institution. In
connection with such employment, the Consultant has entered into certain
agreements with the Institution relating to ownership of intellectual property
rights, conflicts of interest and other matters, and is subject to certain
policy statements of the Institution (collectively, the "Institutional
Agreement"). If any provision of this Agreement is in conflict with the
Institutional Agreement, then the Institutional Agreement will govern to the

                                      -2-
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extent of such conflict, and the conflicting provisions of this Agreement will
not apply. Consultant agrees to furnish the Company with copies of such
agreements and policy statements.

                           5.2.     The Consultant will not disclose to the
Company any information that the Consultant is obligated to keep secret pursuant
to an existing confidentiality agreement with a third party, and nothing in this
Agreement will impose any obligation on the Consultant to the contrary.

                           5.3.     The consulting work performed hereunder will
not be conducted on time that is required to be devoted to the Institution or
any other third party. The Consultant shall not use the funding, resources and
facilities of the Institution or any other third party to perform consulting
work hereunder and shall not perform the consulting work hereunder in any manner
that would give the Institution or any third party rights to the product of such
work. Nothing done in Consultant's academic research shall be considered part of
services performed hereunder and nothing herein shall restrict Consultant's
academic research.

                           5.4.     The Consultant has disclosed and, during the
Term, will disclose to the Chief Executive Officer of the Company any conflicts
between this Agreement and any other agreements binding the Consultant.

                  6.       EXCLUSIVE SERVICES DURING THE TERM. Subject to
written waivers that may be provided by the Company upon request, which shall
not be unreasonably withheld, the Consultant agrees that during the Term of this
Agreement he will not directly or indirectly (i) provide any services in the
Field of Interest, to any other business or commercial entity, (ii) provide any
services to any business or commercial entity competitive with the Company,
(iii) participate in the formation of any business or commercial entity in the
Company's Field of Interest or otherwise competitive with the Company, or (iv)
solicit or hire away any employee or consultant of the Company. The Consultant
has disclosed his relationships with the companies listed on Exhibit A attached
hereto and the foregoing will not apply to such relationships as disclosed on
Exhibit A. Consultant shall notify the Company of all other consulting
agreements which Consultant has entered into, or any consulting services which
Consultant may provide, to any third party.

                  7.       DIRECTION OF PROJECTS AND INVENTIONS TO THE COMPANY.
Subject to the Consultant's obligations under the Institutional Agreement and
confidentiality obligations to third parties, during the Term of this Agreement,
the Consultant will use his best efforts (i) to disclose to the Chief Executive
Officer of the Company, on a confidential basis, technology and product
opportunities which come to the attention of the Consultant in the Company's
Field of Interest, and any invention, improvement, discovery, process, formula
or method or other intellectual property relating to or useful in, the Company's
Field of Interest (collectively "New Discoveries") , whether or not patentable
or copyrightable, and whether or not discovered or developed by Consultant, and
(ii) will regard to any New Discoveries discovered or developed by Consultant at
the Institution, to solicit and encourage the institution to enter into an
agreement with the Company to exclusively license such New Discovery to the
Company.

                                      -3-
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                  8.       INVENTIONS DISCOVERED BY THE CONSULTANT WHILE
PERFORMING SERVICES HEREUNDER. The Consultant will promptly and fully disclose
to the Chief Executive Officer of the Company any invention, improvement,
discovery, process, formula, technique, method, trade secret, or other
intellectual property, whether or not patentable, whether or not copyrightable
(collectively, "Invention") made, conceived, developed, or first reduced to
practice by the Consultant, either alone or jointly with others, while
performing services hereunder. The Consultant hereby assigns to the Company all
of his right, title and interest in and to any such Inventions. The Consultant
will execute any documents necessary to perfect the assignment of such
Inventions to the Company and to enable the Company to apply for, obtain, and
enforce patents or copyrights in any and all countries on such Inventions. The
Consultant hereby irrevocably designates the Secretary of the Company as his
agent and attorney-in-fact to execute and file any such document and to do all
lawful acts necessary to apply for and obtain patents and copyrights, and to
enforce the Company's rights under this paragraph. This Section 8 will survive
the termination of this Agreement.

                  9.       CONFIDENTIALITY.

                           9.1.     The Consultant acknowledges that, during the
course of performing his services hereunder, the Company will be disclosing
information to the Consultant, and the Consultant will be developing information
related to the Company's Field of Interest, Inventions, projects, products,
potential customers, personnel, business plans, and finances, as well as other
commercially valuable information (collectively "Confidential Information"). The
Consultant acknowledges that the Company's business is extremely competitive,
dependent in part upon the maintenance of secrecy, and that any disclosure of
the Confidential Information would result in serious harm to the Company.

                           9.2.     The Consultant agrees that the Confidential
Information will be used by the Consultant only in connection with consulting
activities hereunder, and will not be used in any way that is detrimental to the
Company.

                           9.3.     The Consultant agrees not to disclose,
directly or indirectly, the Confidential Information to any third person or
entity, other than representatives or agents of the Company. The Consultant will
treat all such information as confidential and proprietary property of the
Company.

                           9.4.     The term "Confidential Information" does not
include information that (i) is or becomes generally available to the public
other than by disclosure in violation of this Agreement, (ii) was within the
relevant party's possession prior to being furnished to such party, (iii)
becomes available to the relevant party on a nonconfidential basis, or (iv) was
independently developed by the relevant party without reference to the
information provided by the Company.

                           9.5.     The Consultant may disclose any Confidential
Information that is required to be disclosed by law, government regulation or
court order. If disclosure is required, the Consultant will give the Company
advance notice so that the Company may seek a protective order or take other
action reasonable in light of the circumstances.

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                           9.6.     Upon termination of this Agreement, the
Consultant will promptly return to the Company all materials containing
Confidential Information as well as data, records, reports and other property,
furnished by the Company to the Consultant or produced by the Consultant in
connection with services rendered hereunder, together with all copies of any of
the foregoing. Notwithstanding such return, the Consultant shall continue to be
bound by the terms of the confidentiality provisions contained in this Section 9
for a period of three years after the termination of this Agreement.

                  10.      FREEDOM TO PUBLISH.

                           10.1.    The Company acknowledges the Consultant's
obligation to disseminate new knowledge and research findings. Notwithstanding
the confidentiality provisions, or any other provision, of this Agreement, the
Consultant may publish and make oral presentations of the results of the
Consultant's work performed pursuant to this Agreement under the terms set forth
in this Section 10.

                           10.2.    The Consultant acknowledges that publication
or oral disclosure of any Invention or other work prior to filing for patent or
copyright protection could result in the complete loss of any commercial value
of the Consultant's research to the Institution, the Company, and/or the
Consultant, as the case may be. The Consultant will provide the Company with
sufficient disclosure regarding Inventions owned by the Company under Section 8
at least 90 days prior to publication to allow the Company to evaluate such
disclosure; Consultant will work with the Institution (and the Company if
appropriate) to file patent or copyright applications prior to disclosure or
publication, or to modify such publication if such disclosure regarding
Inventions owned by the Company under Section 8 would materially affect the
business of the Company.

                  11.      USE OF NAME. It is understood that the name of the
Consultant and Consultant's affiliation with the Institution will appear in
disclosure documents required by securities laws, and in other regulatory and
administrative filings in the ordinary course of the Company's business. It is
also understood that the name of the Consultant and Consultant's affiliation
with the Institution will appear in such filings and disclosure documents in
connection with the Company's Scientific Advisory Board. The above described
uses will be deemed to be non-commercial uses. The name of the Consultant or the
Institution will not be used for any commercial purpose without the Consultant's
consent.

                  12.      NO CONFLICT: VALID AND BINDING. The Consultant
represents that neither the execution of this Agreement nor the performance of
the Consultant's obligations under this Agreement (as modified to the extent
required by Section 5) will result in a violation or breach of any other
agreement by which the Consultant is bound. The Company represents that this
Agreement has been duly authorized and executed and is a valid and legally
binding obligation of the Company, subject to no conflicting agreements.

                  13.      NOTICES. Any notice provided under this Agreement
shall be in writing and shall be deemed to have been effectively given (i) upon
receipt when delivered personally,

                                      -5-
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(ii) one day after sending when sent by private express mail service (such as
Federal Express), or (iii) 5 days after sending when sent by regular mail to the
following address:

                  In the case of the Company:

                           PharmaCopeia, Inc.
                           c/o Avalon Ventures
                           1020 Prospect Street, Suite 405
                           La Jolla, CA  902037
                           Attn:    Lawrence A. Bock
                                    Acting President

                  In the case of the Consultant:

                           Paul A. Bartlett
                           Department of Chemistry
                           University of California
                           Berkeley, CA  94720

  or to other such address as may have been designated by the Company or the
  Consultant by notice to the other given as provided herein.

                  14.      INDEPENDENT CONTRACTOR: WITHHOLDING. The Consultant
will at all times be an independent contractor, and as such will not have
authority to bind the Company. Consultant will not act as an agent nor shall he
be deemed to be an employee of the Company for the purposes of any employee
benefit program, unemployment benefits, or otherwise. The Consultant recognizes
that no amount will be withheld from his compensation for payment of any
federal, state, or local taxes and that the Consultant has sole responsibility
to pay such taxes, if any, and file such returns as shall be required by
applicable laws and regulations. Consultant shall not enter into any agreements
or incur any obligations on behalf of the Company.

                  15.      ASSIGNMENT. Due to the personal nature of the
services to be rendered by the Consultant, the Consultant may not assign this
Agreement. The Company may assign all rights and liabilities under this
Agreement (as a group with other similar agreements with members of the
Scientific Advisory Board) to a subsidiary or an affiliate or to a successor to
all or a substantial part of its business and assets without the consent of the
Consultant. Subject to the foregoing, this Agreement will inure to the benefit
of and be binding upon each of the heirs, assigns and successors of the
respective parties.

                  16.      SEVERABILITY. If any provision of this Agreement
shall be declared invalid, illegal or unenforceable, such provision shall be
severed and the remaining provisions shall continue in full force and effect.

                  17.      REMEDIES. The Consultant acknowledges that the
Company would have no adequate remedy at law to enforce Sections 6, 8 and 9
hereof. In the event of a violation by

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the Consultant of such Sections, the Company shall have the right to obtain
injunctive or other similar relief, as well as any other relevant damages,
without the requirement of posting bond or other similar measures.

                  18.      GOVERNING LAW; ENTIRE AGREEMENT; AMENDMENT. This
Agreement shall be governed by the laws of the State of California applicable to
agreements made and to be performed within such State, represents the entire
understanding of the parties, supersedes all prior agreements between the
parties, and may only be amended in writing.

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<PAGE>

                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the date first written above.

PHARMACOPEIA, INC.                            CONSULTANT:

By:      /s/ Lawrence A. Bock                          /s/ Paul A. Bartlett
   ----------------------------------         ----------------------------------
     Lawrence A. Bock                           Paul A. Bartlett
     Acting President
                                                Date:
                                                     ---------------------------

                                      -8-
<PAGE>

                                    EXHIBIT A

                               OTHER RELATIONSHIPS

                          [List, if none so indicate.]

Advisory services currently provided to other pharmaceutical companies

Agouron Pharmaceuticals, Inc. consultant
Sandoz Research Institute Scientific Advisory Board
Schering-Plough, Inc. consultant to process development group
SmithKline Beecham, Inc. Chemical Technologies Advisory Board
Tularik, Inc. Scientific Advisory Board

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