COMBICHEM INC
S-1/A, 1998-04-27
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 27, 1998
    
                                                      REGISTRATION NO. 333-37981
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 7
    
                                       TO
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                                COMBICHEM, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                <C>                                <C>
             DELAWARE                             8731                            33-0617379
 (STATE OR OTHER JURISDICTION OF      (PRIMARY STANDARD INDUSTRIAL             (I.R.S. EMPLOYER
  INCORPORATION OR ORGANIZATION)      CLASSIFICATION CODE NUMBER)           IDENTIFICATION NUMBER)
</TABLE>
 
               9050 CAMINO SANTA FE, SAN DIEGO, CALIFORNIA 92121
                                 (619) 530-0484
              (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
       INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                             DR. VICENTE ANIDO, JR.
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              9050 CAMINO SANTA FE
                          SAN DIEGO, CALIFORNIA 92121
                                 (619) 530-0484
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                            ------------------------
                                   COPIES TO:
 
<TABLE>
<S>                                                 <C>
               FAYE H. RUSSELL, ESQ.                              FREDERICK T. MUTO, ESQ.
              THOMAS E. HORNISH, ESQ.                              ERIC J. LOUMEAU, ESQ.
               LANCE S. KURATA, ESQ.                           CHRISTOPHER W. KRUEGER, ESQ.
          BROBECK, PHLEGER & HARRISON LLP                           COOLEY GODWARD LLP
          550 WEST "C" STREET, SUITE 1300                    4365 EXECUTIVE DRIVE, SUITE 1100
            SAN DIEGO, CALIFORNIA 92101                             SAN DIEGO, CA 92121
                  (619) 234-1966                                      (619) 550-6000
</TABLE>
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ] ------------
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ] ------------
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SUCH SECTION 8(a),
MAY DETERMINE.
================================================================================
<PAGE>   2
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The following table sets forth all expenses, other than underwriting
discounts and commissions, payable by the Registrant in connection with the sale
of the Common Stock being registered. All the amounts shown are estimates,
except for the registration fee, the Nasdaq National Market filing fee and the
NASD fee.
 
<TABLE>
<S>                                                           <C>
Registration fee............................................  $   10,194
Nasdaq National Market fee..................................      87,000
NASD fee....................................................       3,864
Blue Sky fees and expenses..................................      10,000
Printing and engraving expenses.............................     230,000
Legal fees and expenses.....................................     335,000
Accounting fees and expenses................................     190,000
Transfer Agent and Registrar fees...........................       5,000
Miscellaneous expenses......................................     128,942
                                                              ----------
          TOTAL.............................................  $1,000,000
                                                              ==========
</TABLE>
 
ITEM 14. INDEMNIFICATION OF OFFICERS AND DIRECTORS.
 
     Section 145 of the Delaware General Corporation Law permits indemnification
of officers and directors of the Company under certain conditions and subject to
certain limitations. Section 145 of the Delaware General Corporation Law also
provides that a corporation has the power to purchase and maintain insurance on
behalf of its officers and directors against any liability asserted against such
person and incurred by him or her in such capacity, or arising out of his or her
status as such, whether or not the corporation would have the power to indemnify
him or her against such liability under the provisions of Section 145 of the
Delaware General Corporation Law.
 
     Article VII, Section 1 of the Restated Bylaws of the Company provides that
the Company shall indemnify its directors and executive officers to the fullest
extent not prohibited by the Delaware General Corporation Law. The rights to
indemnity thereunder continue as to a person who has ceased to be a director,
officer, employee or agent and inure to the benefit of the heirs, executors and
administrators of the person. In addition, expenses incurred by a director or
executive officer in defending any civil, criminal, administrative or
investigative action, suit or proceeding by reason of the fact that he or she is
or was a director or officer of the Company (or was serving at the Company's
request as a director or officer of another corporation) shall be paid by the
Company in advance of the final disposition of such action, suit or proceeding
upon receipt of an undertaking by or on behalf of such director or officer to
repay such amount if it shall ultimately be determined that he or she is not
entitled to be indemnified by the Company as authorized by the relevant section
of the Delaware General Corporation Law.
 
     As permitted by Section 102(b)(7) of the Delaware General Corporation Law,
Article V, Section (A) of the Company's Certificate of Incorporation provides
that a director of the Company shall not be personally liable for monetary
damages for breach of fiduciary duty as a director, except for liability (i) for
any breach of the director's duty of loyalty to the Company or its stockholders,
(ii) for acts or omissions not in good faith or acts or omissions that involve
intentional misconduct or a knowing violation of law, (iii) under Section 174 of
the Delaware General Corporation Law or (iv) for any transaction from which the
director derived any improper personal benefit.
 
     The Company has entered into indemnification agreements with each of its
directors and executive officers. Generally, the indemnification agreements
attempt to provide the maximum
 
                                      II-1
<PAGE>   3
 
protection permitted by Delaware law as it may be amended from time to time.
Moreover, the indemnification agreements provide for certain additional
indemnification. Under such additional indemnification provisions, however, an
individual will not receive indemnification for judgments, settlements or
expenses if he or she is found liable to the Company (except to the extent the
court determines he or she is fairly and reasonably entitled to indemnity for
expenses), for settlements not approved by the Company or for settlements and
expenses if the settlement is not approved by the court. The indemnification
agreements provide for the Company to advance to the individual any and all
reasonable expenses (including legal fees and expenses) incurred in
investigating or defending any such action, suit or proceeding. In order to
receive an advance of expenses, the individual must submit to the Company copies
of invoices presented to him or her for such expenses. Also, the individual must
repay such advances upon a final judicial decision that he or she is not
entitled to indemnification.
 
     The Company has purchased directors' and officers' liability insurance. The
Company intends to enter into additional indemnification agreements with each of
its directors and executive officers to effectuate these indemnity provisions.
 
     The Underwriting Agreement (Exhibit 1.1 hereto) contains provisions by
which the Underwriters have agreed to indemnify the Company, each person, if
any, who controls the Company within the meaning of Section 15 of the Securities
Act, each director of the Company, and each officer of the Company who signs
this Registration Statement, with respect to information furnished in writing by
or on behalf of the Underwriters for use in the Registration Statement.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.
 
     Since September 30, 1994, the Company has sold and issued the following
unregistered securities (which numbers have not been adjusted for the
one-for-four reverse stock split effected in October 1997).
 
 (1) From September 30, 1994 to March 31, 1998, the Company issued an aggregate
     of 7,512,036 options to purchase Common Stock with exercise prices ranging
     from $0.062 to $2.00 per share under the Predecessor Plan and an aggregate
     of 5,131,596 shares of Common Stock were issued through the exercise of
     options granted under the Predecessor Plan for an aggregate exercise price
     of $527,216. For additional information concerning these transactions,
     reference is made to the information contained under the caption
     "Management -- Benefit Plans" in the form of the Prospectus included
     herein.
 
 (2) On October 14, 1994, the Company issued 200,000 shares of Series Z
     Preferred Stock to Sydney Brenner for an aggregate consideration of
     $100,000.
 
 (3) On October 18, 1994, the Company issued 500,000 shares of Common Stock to
     Robert A. Curtis, former Chief Executive Officer of the Company, at $.01
     per share, of which 229,160 were vested as of the date of the termination
     of his employment in October 1995.
 
 (4) On October 18, 1994, the Company issued an aggregate of 2,500 shares of
     Common Stock to one investor for an aggregate consideration of $25.
 
 (5) On November 1, 1994, the Company issued an aggregate of 400,000 shares of
     Series A Preferred Stock to certain funds advised by Sequoia Capital for an
     aggregate consideration of $200,000.
 
 (6) On November 1, 1994, the Company issued an aggregate of 100,000 shares of
     Common Stock to certain venture funds advised by Sequoia Capital for an
     aggregate consideration of $5,000.
 
 (7) On November 8, 1994, the Company issued an aggregate of 175,000 shares of
     Common Stock to one investor for an aggregate consideration of $8,750.
 
 (8) On November 18, 1994, the Company issued an aggregate of 10,000 shares of
     Common Stock to one investor for an aggregate consideration of $500.
 
                                      II-2
<PAGE>   4
 
 (9) From November 23, 1994 through January 15, 1995, the Company issued an
     aggregate of 2,226,667 shares of Series B Preferred Stock to certain funds
     advised by Sequoia Capital, Forward Ventures II, L.P. and an individual
     investor for an aggregate consideration of $1,670,000.
 
(10) In December 1994, the Company issued a warrant to purchase 83,655 shares of
     Series Z Preferred Stock to Comdisco, Inc. at an exercise price of $0.50
     per share in connection with an equipment lease financing.
 
(11) From January 1, 1995 through April 24, 1995, the Company issued an
     aggregate of 130,000 shares of Common Stock to eight investors for an
     aggregate consideration of $9,750.
 
(12) On March 20, 1995, the Company issued an aggregate of 400,000 shares of
     Common Stock to The Scripps Research Institute for an aggregate
     consideration of $40,000.
 
(13) From April 25, 1995 through July 30, 1995, the Company issued an aggregate
     of 650,000 shares of Common Stock to three investors for an aggregate
     consideration of $48,750.
 
(14) On June 15, 1995, the Company issued a warrant to purchase 35,000 shares of
     Common Stock to LJL BioSystems, Inc. at an exercise price of $0.075.
 
(15) In connection with an asset purchase agreement dated August 4, 1995, the
     Company issued an aggregate of 332,777 shares of Series Z Preferred Stock
     to Molecular Simulations, Inc. from June 1996 through July 1996 in
     consideration for certain technology rights.
 
(16) On August 5, 1995, the Company issued 6,000 shares of Common Stock to Ken
     Rubenstein at $.075 per share in connection with a consulting agreement.
 
(17) On August 17, 1995, August 25, 1995 and September 11, 1995, the Company
     issued an aggregate of 12,045,576 shares of Series C Preferred Stock to
     various venture capital funds and certain other investors for an aggregate
     consideration of $7,468,257.
 
(18) On August 17, 1995, the Company issued warrants to purchase 120,968 shares
     of Series C Preferred Stock at an exercise price of $0.62 per share.
 
(19) On September 7, 1995, the Company issued 8,065 shares of Series C Preferred
     Stock to one investor for an aggregate consideration of $5,000.
 
(20) In December 1995, the Company issued an aggregate of 232,500 shares of
     Series J Preferred Stock to three employees upon the exercise of options to
     purchase Series J Preferred Stock at an exercise price of $0.10.
 
(21) On April 9, 1996, the Company issued an aggregate of 5,104,845 shares of
     Series C Preferred Stock to various venture capital funds and certain other
     investors for an aggregate consideration of $3,165,003.
 
(22) In April 1996 and June 1996, the Company issued warrants to purchase an
     aggregate of 240,321 shares of Series C Preferred Stock to Comdisco, Inc.
     at an exercise price of $0.62 per share in connection with an equipment
     lease financing.
 
(23) In May 1996, the Company issued warrants to purchase an aggregate of
     112,903 shares of Series Z Preferred Stock to Silicon Valley Bank and
     MMC/GATX Partnership No. 1 at an exercise price of $0.62 per share in
     connection with an equipment lease financing.
 
(24) On November 15, 1996, the Company issued an aggregate of 9,869,205 shares
     of Series D Preferred Stock to various venture capital funds and certain
     other investors for an aggregate consideration of $9,869,205.
 
(25) On January 23, 1997, the Company issued an aggregate of 5,000 shares of
     Common Stock to one investor at $0.10 per share pursuant to a Restricted
     Stock Issuance Agreement for an aggregate consideration of $500.
 
                                      II-3
<PAGE>   5
 
(26) On June 11, 1997, the Company issued an aggregate of 40,000 shares of
     Common Stock to one investor at $0.075 per share for an aggregate
     consideration of $4,000.
 
(27) On July 1, 1997, the Company issued an aggregate of 45,000 shares of Common
     Stock to the University of Pittsburgh for technology rights valued at
     $11,250.
 
(28) On October 7, 1997, the Company issued an aggregate of 50,000 shares of
     Common Stock to two investors for past services rendered to the Company.
 
(29) On October 10, 1997, the Company issued an aggregate of 1,000,000 shares of
     Common Stock to ImClone Systems Incorporated in conjunction with a
     collaboration agreement.
 
(30) On October 15, 1997, the Company issued an aggregate of 4,000,000 shares of
     Common Stock to Elan International Services Ltd., in conjunction with a
     collaboration agreement.
 
     The sales and issuances of securities in the above transactions were deemed
to be exempt under the Act by virtue of Section 4(2) thereof and/or Regulation D
and Rule 701 promulgated thereunder as transactions not involving any public
offering. The purchasers in each case represented their intention to acquire the
securities for investment only and not with a view to the distribution thereof.
Appropriate legends were affixed to the stock certificates issued in such
transactions. Similar representations of investment intent were obtained and
similar legends imposed in connection with any subsequent transfers of any such
securities. The Company believes that all recipients had adequate access,
through employment or other relationships, to information about the Company to
make an informed investment decision.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
     (a) Exhibits.
 
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                             DESCRIPTION
- --------                            -----------
<C>         <S>
 1.1++      Form of Underwriting Agreement.
 3.1++      Certificate of Incorporation of the Company, as amended.
 3.2++      Form of Amended and Restated Certificate of Incorporation of
            the Company to become effective immediately prior to the
            Offering.
 3.3++      Bylaws of the Company, as amended.
 3.4++      Form of Restated Bylaws of the Company to be effective upon
            completion of the Offering.
 4.1++      Form of Certificate for Common Stock.
 5.1++      Opinion of Brobeck, Phleger & Harrison LLP with respect to
            the Common Stock being registered.
10.1++      Preferred Stock Purchase Agreement for Series A Preferred
            Stock between the Company and Forward Ventures II, L.P.,
            dated August 26, 1994.
10.2++      Preferred Stock Purchase Agreement for Shares of Series Z
            Preferred Stock between the Company and Sydney Brenner,
            dated October 14, 1994.
10.3++      Stock Purchase Agreement for Shares of Series A Preferred
            Stock and Common Stock between the Company and the investors
            listed on Exhibit A thereto, dated November 1, 1994.
10.4++      Stock Purchase Agreement Series B Preferred Stock between
            the Company and the purchasers listed on Exhibit A thereto,
            dated November 29, 1994.
10.5++      Series C Preferred Stock Purchase Agreement between the
            Company and the purchasers listed on Schedule A thereto,
            dated August 17, 1995.
10.6++      Stock Purchase Agreement for Series C Preferred Stock
            between the Company and Todd Schmidt dated September 7,
            1995.
</TABLE>
 
                                      II-4
<PAGE>   6
 
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                             DESCRIPTION
- --------                            -----------
<C>         <S>
10.7*++     Supplemental Purchase Agreement between the Company and the
            purchasers on Schedule A thereto, dated April 8, 1996.
10.8*++     Series D Preferred Stock Purchase Agreement between the
            Company and the purchasers listed on Schedule A thereto,
            dated November 15, 1996.
10.9++      Amended and Restated Investors' Rights Agreement between the
            Company and the stockholders listed on Schedule A thereto,
            dated November 15, 1996.
10.10++     Series J Preferred Stock Purchase Agreement between the
            Company and Steve Teig, dated June 10, 1997.
10.11++     Series J Preferred Stock Purchase Agreement between the
            Company and Jonathan Greene, dated June 11, 1997.
10.12++     Series J Preferred Stock Purchase Agreement between the
            Company and Andrew Smellie, dated June 11, 1997.
10.13++     Warrant Agreement to Purchase Shares of the Series Z
            Preferred Stock, as amended between the Company and
            Comdisco, Inc., dated December 20, 1994.
10.14++     Common Stock Purchase Warrant between the Company and LJL
            BioSystems, Inc., dated June 15, 1995.
10.15++     Form of Warrant to Purchase Shares of Series C Preferred
            Stock between the Company and the purchasers listed on
            Schedule A thereto, dated August 17, 1995.
10.16++     Form of Warrant Agreement to Purchase Shares of Series C
            Preferred Stock of the Company, between the Company and
            Comdisco, Inc. in the amounts listed on Schedule A thereto.
10.17++     Form of Warrant to Purchase Shares of Series Z Preferred
            Stock between the Company and the purchasers listed on
            Schedule A thereto, dated May 20, 1996.
10.18++     Master Lease Agreement with the Company and Comdisco Inc.,
            dated November 6, 1994, Schedule VL-1, dated November 11,
            1994, Schedule VL-2 dated April 15, 1996 and Schedule VL-3
            dated April 15, 1996.
10.19*++    Collaboration Agreement between the Company and Teijin
            Limited, dated March 29, 1996, as amended.
10.20*++    Collaborative Research and License Agreement between the
            Company and Roche Bioscience, dated October 25, 1996.
10.21*++    Research and Technology Development Agreement between the
            Company and Sumitomo Pharmaceuticals Co., Ltd., dated August
            18, 1997.
10.22*++    Collaborative Research and License Agreement between the
            Company and ImClone Systems Incorporated, dated October 10,
            1997.
10.23*++    Collaborative Research and License Agreement between the
            Company and Athena Neurosciences, Inc., dated October 15,
            1997.
10.24++     Full Recourse Secured Promissory Note and Stock Pledge
            Agreement between the Company and Peter Myers, dated
            September 5, 1995.
10.25++     Promissory Note Secured by Deed of Trust between the Company
            and John Saunders, dated August 30, 1996.
10.26++     Promissory Note between the Company and Vicente Anido, Jr.,
            dated February 24, 1997.
10.27++     Pledge Agreement between the Company and Vicente Anido, Jr.,
            dated February 24, 1997.
10.28++     Promissory Note Secured by Stock Pledge Agreement between
            the Company and Vicente Anido, Jr., dated June 6, 1997
10.29++     Stock Pledge Agreement between the Company and Vicente
            Anido, Jr., dated June 6, 1997.
10.30++     Employment Agreement with Peter Myers, dated March 1, 1995.
</TABLE>
 
                                      II-5
<PAGE>   7
 
   
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                             DESCRIPTION
- --------                            -----------
<C>         <S>
10.31++     Employment Agreement with John Saunders, dated January 1,
            1996.
10.32++     Employment Agreement with Steven Teig, dated July 1, 1995.
10.33++     Employment Agreement with Vicente Anido, Jr., dated March
            14, 1996.
10.34++     Employment Agreement with Lee R. McCracken, dated May 13,
            1996.
10.35++     Employment Letter with Karin Eastham, dated March 14, 1997.
10.36++     Standard Industrial/Commercial Single-Tenant Lease between
            the Company and Campson Corporation, dated December 22,
            1995.
10.37++     Standard Office Lease-Full Service between the Company and
            Nearon Enterprises, LLC, dated October 24, 1996.
10.38++     Lease Agreement between Harbor Investment Partners and the
            Company, dated October 6, 1997.
10.39++     1995 Stock Option/Stock Issuance Plan.
10.40++     1995 Stock Option/Stock Issuance Plan Form of Notice of
            Grant.
10.41++     1995 Stock Option/Stock Issuance Plan Form of Stock Option
            Agreement.
10.42++     1995 Stock Option/Stock Issuance Plan Form of Stock Purchase
            Agreement.
10.43++     1995 Stock Option/Stock Issuance Plan Form of Restricted
            Stock Issuance Agreement.
10.44++     1997 Stock Incentive Plan.
10.45++     1997 Employee Stock Purchase Plan.
10.46++     Form of Indemnification Agreement between the Company and
            each of its directors.
10.47++     Form of Indemnification Agreement between the Company and
            each of its officers.
10.48++     1997 Stock Incentive Plan Form of Notice of Grant of Stock
            Option
10.49++     1997 Stock Incentive Plan Form of Stock Option Agreement
10.50++     1997 Stock Incentive Plan Form of Addendum to Stock Option
            Agreement (Involuntary Termination Following Corporate
            Transaction/Change in Control)
10.51++     1997 Stock Incentive Plan Form of Addendum to Stock Option
            Agreement (Limited Stock Appreciation Right)
10.52++     1997 Stock Incentive Plan Form of Stock Issuance Agreement
10.53++     1997 Stock Incentive Plan Form of Addendum to Stock Issuance
            Agreement (Involuntary Termination Following Corporate
            Transaction/Change in Control)
10.54++     1997 Stock Incentive Plan Form of Notice of Grant of
            Automatic Stock Option (Initial Grant)
10.55++     1997 Stock Incentive Plan Form of Notice of Grant of
            Automatic Stock Option (Annual Grant)
10.56++     1997 Stock Incentive Plan Form of Automatic Stock Option
            Agreement
10.57++     1997 Employee Stock Purchase Plan Form of Stock Purchase
            Agreement
10.58*      Collaborative Research and License Agreement between the
            Company and ICOS Corporation, dated March 30, 1998.
11.1++      Statement of Computation of pro forma net loss per share.
23.1++      Consent of Brobeck, Phleger & Harrison LLP (contained in
            their opinion filed as Exhibit 5.1).
23.2++      Consent of Ernst & Young LLP, Independent Auditors.
24.1++      Power of Attorney (see page II-8).
27.1        Financial Data Schedule.
</TABLE>
    
 
- ---------------
 
++ Previously filed with the Commission.
 
                                      II-6
<PAGE>   8
 
* Certain confidential portions of this Exhibit were omitted by means of
  redacting a portion of the text (the "Mark"). This Exhibit has been filed
  separately with the Secretary of the Commission without the Mark pursuant to
  the Company's Application Requesting Confidential Treatment under Rule 406
  under the Securities Act.
 
     (b) Financial Statement Schedules included separately in the Registration
Statement.
 
     All other schedules are omitted because they are not required, are not
applicable or the information is included in the Financial Statements or Notes
thereto.
 
ITEM 17. UNDERTAKINGS.
 
     The undersigned hereby undertakes to provide to the Underwriters at the
closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the Company
pursuant to the provisions described in Item 14, or otherwise, the Company has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses
incurred or paid by a director, officer or controlling person of the Company in
the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Company will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.
 
     The undersigned registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this registration statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     registration statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
                                      II-7
<PAGE>   9
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Company has
duly caused this Amendment No. 7 to this Registration Statement to be signed on
its behalf by the undersigned, thereunto duly authorized, in the City of San
Diego, County of San Diego, State of California, on the 27th day of April, 1998.
    
 
                                          COMBICHEM, INC.
 
                                          By:    /s/ VICENTE ANIDO, JR.
                                            ------------------------------------
                                                     Vicente Anido, Jr.
                                               President and Chief Executive
                                                           Officer
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
              SIGNATURE                                TITLE                       DATE
              ---------                                -----                       ----
<S>                                    <C>                                    <C>
 
       /s/ VICENTE ANIDO, JR.           President, Chief Executive Officer    April 27, 1998
- -------------------------------------    and Director (Principal Executive
        (Vicente Anido, Jr.)                         Officer)
 
                                                 Vice President of            April 27, 1998
                                       Finance and Administration and Chief
          /s/ KARIN EASTHAM                Financial Officer (Principal
- -------------------------------------                Financial
           (Karin Eastham)                    and Accounting Officer)
 
                  *                     Chairman of the Board and Director    April 27, 1998
- -------------------------------------
           (Pierre Lamond)
 
                  *                                  Director                 April 27, 1998
- -------------------------------------
          (Peter L. Myers)
 
                  *                                  Director                 April 27, 1998
- -------------------------------------
        (Philippe O. Chambon)
 
                  *                                  Director                 April 27, 1998
- -------------------------------------
           (Arthur Reidel)
 
                  *                                  Director                 April 27, 1998
- -------------------------------------
           (William Scott)
</TABLE>
    
 
By:     /s/ VICENTE ANIDO, JR.
    ----------------------------------
           Vicente Anido, Jr.,
             Attorney-in-fact
 
                                      II-8
<PAGE>   10
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
                                                                            SEQUENTIALLY
EXHIBIT                                                                       NUMBERED
 NUMBER                             DESCRIPTION                                 PAGE
- --------                            -----------                             ------------
<C>         <S>                                                             <C>
 1.1++      Form of Underwriting Agreement.
 3.1++      Certificate of Incorporation of the Company, as amended.
 3.2++      Form of Amended and Restated Certificate of Incorporation of
            the Company to become effective immediately prior to the
            Offering.
 3.3++      Bylaws of the Company, as amended.
 3.4++      Form of Restated Bylaws of the Company to be effective upon
            completion of the Offering.
 4.1++      Form of Certificate for Common Stock.
 5.1++      Opinion of Brobeck, Phleger & Harrison LLP with respect to
            the Common Stock being registered.
10.1++      Preferred Stock Purchase Agreement for Series A Preferred
            Stock between the Company and Forward Ventures II, L.P.,
            dated August 26, 1994.
10.2++      Preferred Stock Purchase Agreement for Shares of Series Z
            Preferred Stock between the Company and Sydney Brenner,
            dated October 14, 1994.
10.3++      Stock Purchase Agreement for Shares of Series A Preferred
            Stock and Common Stock between the Company and the investors
            listed on Exhibit A thereto, dated November 1, 1994.
10.4++      Stock Purchase Agreement Series B Preferred Stock between
            the Company and the purchasers listed on Exhibit A thereto,
            dated November 29, 1994.
10.5++      Series C Preferred Stock Purchase Agreement between the
            Company and the purchasers listed on Schedule A thereto,
            dated August 17, 1995.
10.6++      Stock Purchase Agreement for Series C Preferred Stock
            between the Company and Todd Schmidt dated September 7,
            1995.
10.7*++     Supplemental Purchase Agreement between the Company and the
            purchasers on Schedule A thereto, dated April 8, 1996.
10.8*++     Series D Preferred Stock Purchase Agreement between the
            Company and the purchasers listed on Schedule A thereto,
            dated November 15, 1996.
10.9++      Amended and Restated Investors' Rights Agreement between the
            Company and the stockholders listed on Schedule A thereto,
            dated November 15, 1996.
10.10++     Series J Preferred Stock Purchase Agreement between the
            Company and Steve Teig, dated June 10, 1997.
10.11++     Series J Preferred Stock Purchase Agreement between the
            Company and Jonathan Greene, dated June 11, 1997.
10.12++     Series J Preferred Stock Purchase Agreement between the
            Company and Andrew Smellie, dated June 11, 1997.
10.13++     Warrant Agreement to Purchase Shares of the Series Z
            Preferred Stock, as amended between the Company and
            Comdisco, Inc., dated December 20, 1994.
10.14++     Common Stock Purchase Warrant between the Company and LJL
            BioSystems, Inc., dated June 15, 1995.
10.15++     Form of Warrant to Purchase Shares of Series C Preferred
            Stock between the Company and the purchasers listed on
            Schedule A thereto, dated August 17, 1995.
</TABLE>
<PAGE>   11
 
<TABLE>
<CAPTION>
                                                                            SEQUENTIALLY
EXHIBIT                                                                       NUMBERED
 NUMBER                             DESCRIPTION                                 PAGE
- --------                            -----------                             ------------
<C>         <S>                                                             <C>
10.16++     Form of Warrant Agreement to Purchase Shares of Series C
            Preferred Stock of the Company, between the Company and
            Comdisco, Inc. in the amounts listed on Schedule A thereto.
10.17++     Form of Warrant to Purchase Shares of Series Z Preferred
            Stock between the Company and the purchasers listed on
            Schedule A thereto, dated May 20, 1996.
10.18++     Master Lease Agreement with the Company and Comdisco Inc.,
            dated November 6, 1994, Schedule VL-1, dated November 11,
            1994, Schedule VL-2 dated April 15, 1996 and Schedule VL-3
            dated April 15, 1996.
10.19*++    Collaboration Agreement between the Company and Teijin
            Limited, dated March 29, 1996, as amended.
10.20*++    Collaborative Research and License Agreement between the
            Company and Roche Bioscience, dated October 25, 1996.
10.21*++    Research and Technology Development Agreement between the
            Company and Sumitomo Pharmaceuticals Co., Ltd., dated August
            18, 1997.
10.22*++    Collaborative Research and License Agreement between the
            Company and ImClone Systems Incorporated, dated October 10,
            1997.
10.23*++    Collaborative Research and License Agreement between the
            Company and Athena Neurosciences, Inc., dated October 15,
            1997.
10.24++     Full Recourse Secured Promissory Note and Stock Pledge
            Agreement between the Company and Peter Myers, dated
            September 5, 1995.
10.25++     Promissory Note Secured by Deed of Trust between the Company
            and John Saunders, dated August 30, 1996.
10.26++     Promissory Note between the Company and Vicente Anido, Jr.,
            dated February 24, 1997.
10.27++     Pledge Agreement between the Company and Vicente Anido, Jr.,
            dated February 24, 1997.
10.28++     Promissory Note Secured by Stock Pledge Agreement between
            the Company and Vicente Anido, Jr., dated June 6, 1997
10.29++     Stock Pledge Agreement between the Company and Vicente
            Anido, Jr., dated June 6, 1997.
10.30++     Employment Agreement with Peter Myers, dated March 1, 1995.
10.31++     Employment Agreement with John Saunders, dated January 1,
            1996.
10.32++     Employment Agreement with Steven Teig, dated July 1, 1995.
10.33++     Employment Agreement with Vicente Anido, Jr., dated March
            14, 1996.
10.34++     Employment Agreement with Lee R. McCracken, dated May 13,
            1996.
10.35++     Employment Letter with Karin Eastham, dated March 14, 1997.
10.36++     Standard Industrial/Commercial Single-Tenant Lease between
            the Company and Campson Corporation, dated December 22,
            1995.
10.37++     Standard Office Lease-Full Service between the Company and
            Nearon Enterprises, LLC, dated October 24, 1996.
10.38++     Lease Agreement between Harbor Investment Partners and the
            Company, dated October 6, 1997.
10.39++     1995 Stock Option/Stock Issuance Plan.
10.40++     1995 Stock Option/Stock Issuance Plan Form of Notice of
            Grant.
</TABLE>
<PAGE>   12
 
   
<TABLE>
<CAPTION>
                                                                            SEQUENTIALLY
EXHIBIT                                                                       NUMBERED
 NUMBER                             DESCRIPTION                                 PAGE
- --------                            -----------                             ------------
<C>         <S>                                                             <C>
10.41++     1995 Stock Option/Stock Issuance Plan Form of Stock Option
            Agreement.
10.42++     1995 Stock Option/Stock Issuance Plan Form of Stock Purchase
            Agreement.
10.43++     1995 Stock Option/Stock Issuance Plan Form of Restricted
            Stock Issuance Agreement.
10.44++     1997 Stock Incentive Plan.
10.45++     1997 Employee Stock Purchase Plan.
10.46++     Form of Indemnification Agreement between the Company and
            each of its directors.
10.47++     Form of Indemnification Agreement between the Company and
            each of its officers.
10.48++     1997 Stock Incentive Plan Form of Notice of Grant of Stock
            Option
10.49++     1997 Stock Incentive Plan Form of Stock Option Agreement
10.50++     1997 Stock Incentive Plan Form of Addendum to Stock Option
            Agreement (Involuntary Termination Following Corporate
            Transaction/Change in Control)
10.51++     1997 Stock Incentive Plan Form of Addendum to Stock Option
            Agreement (Limited Stock Appreciation Right)
10.52++     1997 Stock Incentive Plan Form of Stock Issuance Agreement
10.53++     1997 Stock Incentive Plan Form of Addendum to Stock Issuance
            Agreement (Involuntary Termination Following Corporate
            Transaction/Change in Control)
10.54++     1997 Stock Incentive Plan Form of Notice of Grant of
            Automatic Stock Option (Initial Grant)
10.55++     1997 Stock Incentive Plan Form of Notice of Grant of
            Automatic Stock Option (Annual Grant)
10.56++     1997 Stock Incentive Plan Form of Automatic Stock Option
            Agreement
10.57++     1997 Employee Stock Purchase Plan Form of Stock Purchase
            Agreement
10.58*      Collaborative Research and License Agreement between the
            Company and ICOS Corporation, dated March 30, 1998.
11.1++      Statement of Computation of pro forma net loss per share.
23.1++      Consent of Brobeck, Phleger & Harrison LLP (contained in
            their opinion filed as Exhibit 5.1).
23.2++      Consent of Ernst & Young LLP, Independent Auditors.
24.1++      Power of Attorney (see page II-8).
27.1        Financial Data Schedule.
</TABLE>
    
 
- ---------------
 
++ Previously filed with the Commission.
 
* Certain confidential portions of this Exhibit were omitted by means of
  redacting a portion of the text (the "Mark"). This Exhibit has been filed
  separately with the Secretary of the Commission without the Mark pursuant to
  the Company's Application Requesting Confidential Treatment under Rule 406
  under the Securities Act.

<PAGE>   1
                                                                   EXHIBIT 10.58








                  COLLABORATIVE RESEARCH AND LICENSE AGREEMENT

                                     BETWEEN

                                 COMBICHEM, INC.

                                       AND

                                ICOS CORPORATION


                                 MARCH 30, 1998








***Certain confidential portions of this Exhibit were omitted by means of
blackout of the text (the "Mark"). This Exhibit has been filed separately with
the Secretary of the Commission without the Mark pursuant to the Company's
Application Requesting Confidential Treatment under Rule 406 of Regulation C of
the Securities Act of 1933.


<PAGE>   2
                  COLLABORATIVE RESEARCH AND LICENSE AGREEMENT

        THIS COLLABORATIVE RESEARCH AND LICENSE AGREEMENT (the "Agreement") is
entered into and made effective as of March 30, 1998 (the "Effective Date"), by
and between COMBICHEM, INC., a Delaware corporation having its principal offices
at 9050 Camino Santa Fe, San Diego, California 92121 ("CombiChem") and ICOS
CORPORATION, a Delaware corporation having its principal offices located at
22021 20th Avenue S.E., Bothell, Washington 98021 ("ICOS").

        WHEREAS, CombiChem has developed, licensed and/or owns certain drug
discovery technology and intellectual property rights, including chemical
library design software, multi-parallel synthesis and purification methods,
chemical libraries suitable for high throughput biological screening assays and
medicinal chemistry (collectively, "CombiChem Technology");

        WHEREAS, as of the Effective Date, ICOS and its Affiliates have
developed and own certain drug discovery and intellectual property rights,
including certain assays, methods and know how regarding the Initial Target and
any Alternative Target(s), among other things (collectively "ICOS Technology");

        WHEREAS, ICOS desires to utilize CombiChem Technology for its drug
discovery activities under ICOS know-how concerning the identification and
characterization of novel small molecule inhibitors for development as
therapeutics for treatment of *** and other diseases in humans;

        WHEREAS, the parties wish to collaborate in a chemical lead and drug
discovery program, commencing on the Effective Date against a Collaboration
Target ("Collaboration");

        WHEREAS, during the Collaboration, the Parties intend to initially focus
on one (1) Initial Target, and thereafter on any Alternative Target(s) as
determined by ICOS;

        NOW, THEREFORE, the Parties agree as follows:

        1.      DEFINITIONS

                1.1     "Active Compound(s)" means a compound (or compounds) or
its Derivatives which

                        (a)     (i)     is selected by the RMC under the
                                        Research Program from Collaboration
                                        Compounds under Section 4.2, or

                                (ii)    is a Derivative of a Collaboration
                                        Compound which has been so selected by
                                        the RMC to be an Active Compound; and

***     Portions of this page have been omitted pursuant to a request for
        Confidential Treatment and filed separately with the Commission.


                                     - 1 -
<PAGE>   3
                        (b)     shows In Vitro Activity satisfactory to the
                                requirements of the Research Plan.

                1.2     "Affiliate" of a Party means any corporation or other
business entity controlled by, controlling or under common control with, such
Party. For this purpose "control" shall mean direct or indirect beneficial
ownership of more than fifty percent (50%) of the voting securities or income
interest in such corporation or other business, or if not meeting the preceding
requirements, any company owned or controlled by or owning or controlling such
Party at the maximum control or ownership right permitted in the country where
such company exists.

                1.3     "Alternative Target" shall have the meaning set forth in
Section 3.2 hereof.

                1.4     "Collaboration" has the meaning set forth in the
preamble.

                1.5     "Collaboration Compound(s)" means a compound (or
compounds) which (a) is synthesized following the Effective Date for screening
against a Collaboration Target under the Research Program, (b) is a pre-existing
or hereafter acquired CombiChem compound which CombiChem desires to designate as
a Collaboration Compound, or (iii) is a pre-existing or hereafter acquired ICOS
compound which ICOS desires to designate as a Collaboration Compound.

                1.6     "Collaboration Patent" means a Patent to which CombiChem
has made an inventive contribution arising out of the Collaboration, as
determined under U.S. Patent law.

                1.7     "Collaboration Target" means (a) the Initial Target
beginning on the Effective Date or (b) an Alternative Target substituted for the
Initial Target under Section 3.2(b) or (c) any other target by mutual agreement
of the Parties.

                1.8     "CombiChem Compound" means a chemical compound that is
proprietary to CombiChem, or whose use or manufacture is proprietary to
CombiChem.

                1.9     "CombiChem Technology" has the meaning set forth in the
preamble.

                1.10    "Confidential Information" includes, but is not limited
to,

                        (a)     all information and materials received by either
                                Party from the other Party pursuant to this
                                Agreement which is confidential under Article 11
                                hereof;

                        (b)     all information and materials by either Party
                                arising out of the Collaboration during the
                                Research Period including, without limitation,
                                information directly and specifically deduced
                                from Confidential Information such as
                                information regarding compounds that were not
                                active against the Targets in the screening or
                                secondary selective assays; and


                                     - 2 -
<PAGE>   4
                        (c)     the terms and conditions of this Agreement.

                1.11    "CPI" means the Consumer Price Index, All Urban
Consumers, as published by the U.S. Bureau of Labor Statistics.

                1.12    "Daughter Libraries" shall mean the compound libraries
which are designed and synthesized as a part of the Collaboration either by
CombiChem or under the direction of the RMC.

                1.13    "Derivative" shall mean a compound (or compounds) which
has resulted

                        (a)     (i) from chemical synthesis, during the
                                Exclusivity Period, to generate an Active
                                Compound or Development Compound in support of
                                the Research Program or (ii) from chemical
                                synthesis on an Active Compound or Development
                                Compound in support of the Research Program; and

                        (b)     is covered under claims of any Collaboration
                                Patent.

                1.14    "Development Compound(s)" means a Collaboration Compound
(or compounds) which

                        (a)     (i) is an Active Compound or (ii) is a
                                Derivative of an Active Compound; and

                        (b)     is determined by ICOS to be appropriate for the
                                purpose of IND filing by ICOS either before
                                preclinical studies or from the results of
                                preclinical studies to determine without
                                limitation, data on efficacy, potency, toxicity,
                                bioavailability and other pharmacokinetics
                                related parameters.

                1.15    "Due Diligence" means the use of by a Party of its
resources in the Collaboration in a manner which is consistent with the exercise
of reasonable and prudent scientific and business judgment as applied to other
programs of ICOS or CombiChem, as the case may be, targeting products aimed at
markets or patient groups of similar sizes and of similar scientific and
commercial potential. With respect to any Development Compound, "Due Diligence"
shall also require ICOS or its Affiliates, partners or licensees to use
commercially reasonable efforts to conduct all necessary preclinical studies and
to file an IND for such Development Compound within a commercially reasonable
period from the date upon which ICOS has designated such Development Compound
from any Active Compound or its Derivatives. For purposes of this Agreement,
failure to exercise Due Diligence by any Party may be alleged by written notice
to such Party describing such failure with specificity and describing the
actions necessary to cure such failure with specificity (the "Due Diligence
Notice"). Sixty (60) days after delivery of a Due Diligence Notice, if the Party
receiving such Due Diligence Notice has not completed the actions necessary to
cure such failure as specified in such Due


                                     - 3 -
<PAGE>   5
Diligence Notice to the reasonable satisfaction of the other Party, the Parties
shall immediately be subject to the dispute resolution provisions set forth in
Article 15 hereof starting at the discussions between the Parties' Chief
Executive Officers described in Section 15.1 hereof.

                1.16    "Exclusivity Period" means the Research Period plus ***
as may be extended or reduced pursuant to Article 4 hereof.

                1.17    "Field" means all therapeutic indications in humans for
any Target against which a Collaboration Compound, Active Compound, Development
Compound or Products may be directed.

                1.18    "First Commercial Sale" of a Product shall mean the
first sale for use or consumption of such Product in a country after required
marketing and pricing approval has been granted by the governing health
regulatory authority of such country. Sale to an Affiliate shall not constitute
a First Commercial Sale unless the Affiliate is the end user of the Product.

                1.19    "FTE" shall mean a full-time equivalent employee of
CombiChem having the requisite skills to fulfill CombiChem's obligations under
this Agreement. For purposes of this Agreement, the FTEs shall include synthetic
and analytical chemists, compound control scientists and computational
scientists.

                1.20    "Inactive Compound(s)" means a Collaboration Compound(s)
which is not an Active Compound or an Active Compound that is reclassified as
described in Section 4.2 hereof.

                1.21    "ICOS Compound" means a chemical compound that is
proprietary to ICOS or whose use or manufacture is proprietary to ICOS or its
Affiliates.

                1.22    "ICOS Technology" shall have the meaning set forth in
the preamble of this Agreement.

                1.23    "In Vitro Activity" shall mean during the Research Term,
the observation of *** in assays as described by ICOS in the Research Plan for
each Collaboration Target.

                1.24    "Initial Target" shall have the meaning set forth in
Section 3.1 hereof.

                1.25    "Net Sales" means the gross sales invoiced by ICOS, its
Affiliates or its sublicensees for Products to non-Affiliated Third Parties (and
to Affiliates who are the end users of such Products) less actual deductions or
returns (including withdrawals and recalls), rebates (price reductions,
including formulary or Medicaid and similar types of rebates, e.g. chargebacks),
cash, trade or volume (quantity) discounts, discounts granted at the time of
invoicing, the cost of transport, insurance, delivery, sales taxes and use,
tariff, excise or other taxes (other than income taxes) directly linked to and
included in the gross sales amount as computed on a product-by-product basis
for the countries concerned, whereby the amount of such sales in foreign


***     Portions of this page have been omitted pursuant to a request for
        Confidential Treatment and filed separately with the Commission.


                                     - 4 -
<PAGE>   6
currencies is converted into United States dollars at the exchange rate of the
last business day for each calendar month as reported in The Wall Street
Journal.

                1.26    "Patent" means (a) valid and enforceable U.S. or non
U.S. Patent, and any non-U.S. equivalent, including any extension (including
Supplemental Protection Certificates), registration, confirmation, reissue,
continuation, divisionals, continuation-in-part, reexamination or renewal
thereof, or (b) pending applications for any of the foregoing, whether filed or
issued before or after the Effective Date.

                1.27    "Party" means CombiChem or ICOS, as the case may be,
including their respective Affiliates, permitted successors and assigns.

                1.28    "Product(s)" means any product containing an Active
Compound or Development Compound with such compound as the active ingredient or
one of the active ingredients, which is the subject of one or more claims under
a Collaboration Patent and which is granted regulatory approval by the governing
health regulatory authority of the applicable country for marketing in the
Field.

                1.29    "Project Team" shall have the meaning set forth in
Section 2.1(c).

                1.30    "Research Management Committee" or "RMC" has the meaning
set forth in Article 6 below.

                1.31    "Research Period" means that part of the Collaboration
commencing *** or sooner by mutual agreement *** unless earlier terminated, and
which can be extended in accordance with Section 7.1 below for the Initial
Target or an Alternative Target substituted therefore under Section 3.2(b)
herein.

                1.32    "Research Plan" means the research plan to be agreed in
writing between the Parties, which describes in mutually agreed upon detail the
research activities to be performed for each Collaboration Target.

                1.33    "Research Program" means the research and activities to
be conducted for the Collaboration during the Research Period including, without
limitation, the activities described in the Research Plan and set forth in
Sections 2.1 and 2.2 of this Agreement.

                1.34    "Returned Compound" shall have the meaning set forth in
Section 9.2.

                1.35    "Royalty Term" means, in the case of any Product, in any
country, the period of time commencing on the First Commercial Sale and ending
upon the later of (a) *** or (b) the expiration of the last-to-expire Patent
resulting from the Research Program filed in the Field during the Exclusivity
Period with claims covering that Product in the relevant country. In the event
such *** period shall extend beyond the end of the term or terms of the last to
expire Patents resulting from the Research Program containing a valid claim in
such country, the earned royalties


***     Portions of this page have been omitted pursuant to a request for
        Confidential Treatment and filed separately with the Commission.


                                     - 5 -
<PAGE>   7
hereunder in such country shall be *** for the remainder of such *** period so
long as *** as the Product exists and is sold in competition with the Product.

                1.36    "Target" means a biomolecular entity that a
Collaboration Compound is synthesized against wherein the small molecule
demonstrates relevant activity and unless otherwise specified may include both
Initial and Alternative Targets.

                1.37    "Target Exclusivity Obligations" shall have that meaning
set forth in subsection 4.1(a) hereof.

                1.38    "Territory" means the entire world.

                1.39    "Third Party" means an entity other than CombiChem or
ICOS or their respective Affiliates or assigns.

                1.40    "UIL" means CombiChem's proprietary Universal Informer
Library(TM).

        2.      RESEARCH COLLABORATION

                2.1     CombiChem Responsibilities. CombiChem shall with Due
Diligence provide the following resources to ICOS and conduct the following
activities under the Research Program and as more fully described in the
Research Plan:

                        (a)     Within thirty (30) days of the Effective Date,
                                CombiChem will deliver to ICOS its UIL
                                sufficient in quantity for ICOS to screen
                                against the Initial Target and any Target
                                contained in Appendix B at the time of such
                                shipment.

                        (b)     At any time following the Effective Date,
                                CombiChem shall provide to ICOS data analysis
                                and evaluations for results from the screening
                                of the UIL against the Initial Target and any
                                substituted Alternative Target under Section
                                3.2(b) herein within *** of CombiChem's receipt
                                of the relevant screening data from ICOS.

                        (c)     During the Research Period, CombiChem shall (i)
                                review data and information regarding the
                                Collaboration Target provided by ICOS and
                                derived from the UIL by CombiChem; (ii) based on
                                such data and information and using the
                                CombiChem Technology, design Daughter Libraries;
                                and (iii) supply all lead chemistries and
                                synthesize compounds as provided in Section 5.4
                                hereof.

                        (d)     During the Research Period, CombiChem shall keep
                                ICOS informed of its activities performed in
                                connection with the Collaboration,


***     Portions of this page have been omitted pursuant to a request for
        Confidential Treatment and filed separately with the Commission.


                                     - 6 -
<PAGE>   8
                                including, without limitation, providing ICOS
                                with data and information (and, upon ICOS's
                                request, reasonable quantities of samples
                                pursuant to Section 5.4) regarding the status of
                                all Collaboration Compounds prior to the
                                meetings of the Research Management Committee.

                        (e)     Subject to Section 2.3, Article 3 and Section
                                8.3 hereof, and at all times during the Research
                                Period, CombiChem shall dedicate, in separate
                                laboratory facilities as to its chemistry
                                efforts *** to conduct all of CombiChem's
                                activities in connection with the Collaboration
                                at a per annum rate of U.S. *** per FTE to be
                                paid by ICOS. The *** unless the RMC recommends
                                otherwise and ICOS and CombiChem agree in
                                writing to alter the size of *** .

                2.2     ICOS Responsibilities. ICOS shall with Due Diligence
provide the following resources to CombiChem and conduct the following
activities under the Research Program as more fully described in the Research
Plan:

                        (a)     ICOS shall make payment to CombiChem for the
                                Collaboration as set forth in Article 8 hereof,
                                provide screening, biological and structural
                                data and information (including leads and/or
                                screening hits and any assay methods relating to
                                Collaboration Compounds) to CombiChem necessary
                                for CombiChem to perform its duties under this
                                Agreement, and will assume scientific, financial
                                and administrative responsibility for screening
                                and biological support activities, drug
                                development and regulatory filings during and
                                after the term of the Collaboration on the terms
                                set forth below.

                        (b)     During the Research Period, ICOS shall provide
                                CombiChem with data and information regarding
                                Collaboration Compounds and the Collaboration
                                Target assays developed by ICOS under the
                                Research Program prior to the meetings of the
                                Research Management Committee.

                        (c)     During the Exclusivity Period, ICOS shall screen
                                Collaboration Compounds for *** and, where ICOS
                                reasonably deems it to be appropriate, ***
                                against the Collaboration Target.

                        (d)     During the Exclusivity Period, with respect to
                                any Collaboration Target against which an Active
                                Compound has been designated by the RMC, ICOS
                                shall (i) screen Active Compounds, (ii)
                                determine Development Compounds, and (iii)
                                endeavor to develop Products.


***     Portions of this page have been omitted pursuant to a request for
        Confidential Treatment and filed separately with the Commission.


                                     - 7 -
<PAGE>   9
                                At any time during the Collaboration, ICOS may
                                apply chemistry effort, including synthesis, to
                                any Collaboration Compound as agreed and
                                directed by the RMC.

                        (e)     Following the first IND filing through First
                                Commercial Sale, ICOS shall provide CombiChem
                                with an annual report similar to that which
                                would be provided in the usage of the trade or
                                business, by a licensee to a licensor
                                summarizing ICOS's activities in developing
                                Development Compounds that shall include,
                                without limitation, all material information
                                with respect to the following: (i) status of
                                both regulatory filings and communications with
                                the United States Food and Drug Administration
                                or any foreign equivalent ("FDA"); (ii) status
                                of Patents within and outside of the United
                                States; (iii) status of current and planned
                                clinical trials; (iv) occurrence of any
                                milestone events; and (v) any permitted
                                sublicensing under this Agreement.

                        (f)     During the Research Period and in connection
                                with CombiChem providing the services in Section
                                2.1(c) hereof, ICOS shall, at its option, send
                                *** to conduct ICOS' activities at CombiChem's
                                facilities under the Research Program. ICOS
                                shall have sole responsibility for the expenses
                                associated with its visiting chemists,
                                including, without limitation, salary, travel,
                                living and other associated expenses of such
                                chemists.

                2.3     Conduct of Research Program. The Parties hereby agree
that the Research Programs shall be carried out in accordance with the Research
Plan and this Agreement, as each may be amended from time to time. The Research
Management Committee shall review the Research Plan on a regular and ongoing
basis and may make written changes to the Research Plan so long as such changes
are mutually agreed to in writing by CombiChem and ICOS.

                2.4     Third Party Licenses. Each Party shall be solely
responsible for any Third Party license fees required to perform its obligations
under this Agreement.

        3.      TARGETS

                3.1     Initial Target. ***.

                3.2     Alternative Target.

                        (a)     An Alternative Target is any of those
alternative targets selected from Appendix B attached hereto, as amended in
writing by mutual agreement of the Parties hereto from time to time, and for
which ICOS has identified such selection in a written notice to CombiChem.
Unless otherwise agreed by the Parties in writing or as set forth in this
Section 3.2, ICOS shall have the right to screen the UIL against any target
contained in Appendix B, as


***     Portions of this page have been omitted pursuant to a request for
        Confidential Treatment and filed separately with the Commission.


                                     - 8 -
<PAGE>   10
amended, but shall *** in accordance with Section 8.1(b) hereof.

                        (b)     At any time prior to *** , ICOS may decide, or
may accept a recommendation by the RMC, to pursue any Alternative Target in
substitution for the Initial Target and thereafter the Alternative Target shall
be deemed to be a Collaboration Target for all purposes under this Agreement.
Such substitution by ICOS shall be effective upon the date of a written notice
provided to CombiChem by ICOS expressly stating that such substitution shall be
made and identifying the Alternative Target from Appendix B to be substituted.

                3.3     Substitute Target. After the commencement of a Research
Program with respect to the Collaboration Target, the Parties, by mutual
agreement, may substitute another target for such Collaboration Target.

        4.      EXCLUSIVITY

                4.1     Collaboration Target Exclusivity.

                        (a)     Following the Effective Date, so long as ICOS or
                                its Affiliates are proceeding with Due Diligence
                                for that Collaboration Target, CombiChem shall
                                not work on, or provide services, or advise,
                                either independently, or with any Third Parties
                                (except where CombiChem is providing its UIL to
                                Third Parties without knowledge of such Third
                                Parties' target) (the "Target Exclusivity
                                Obligations"), except (a) as provided for in
                                Section 12.2 hereof with regard to any Public
                                Statements, (b) with respect to any Third
                                Parties who are collaborators or proposed
                                collaborators of CombiChem, CombiChem shall have
                                the right, consistent with its corporate policy
                                (but without identifying any Collaboration
                                Target), to notify any such Third Party of its
                                decision and/or inability to work on such
                                Collaboration Target with that Third Party or
                                (c) if CombiChem's Target Exclusivity
                                Obligations have terminated pursuant to
                                subsection 4.1 (b) below.

                        (b)     Upon the commencement of the Research Period and
                                following synthesis of a Daughter Library by
                                CombiChem for the Collaboration Target, the
                                Target Exclusivity Obligations with respect to
                                such Collaboration Target shall continue until
                                (1) ICOS has provided CombiChem with a notice
                                and release of Target Exclusivity Obligations,
                                effective in sixty (60) days, that, because of
                                business and scientific reasons, ICOS has
                                decided to cease research and/or development
                                activities for the Initial Target, or (2) ICOS
                                has provided CombiChem with a notice and release
                                of Target Exclusivity Obligations, effective ***
                                from the date of such notice and release, that
                                ICOS has decided to cease research


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                                     - 9 -
<PAGE>   11
                                and/or development activities for a specific
                                Collaboration Target except the Initial Target,
                                or (3) *** after the date of the written notice
                                provided by ICOS under Section 3.2(b) herein, or
                                (4) (A) ICOS has failed to exercise Due
                                Diligence with respect to that Collaboration
                                Target and (B) has not transferred or assigned
                                its control of the development of its program
                                for that Collaboration Target to a Third Party
                                with due diligence requirements no less
                                stringent than those set forth in this
                                Agreement. In the event of such transfer or
                                assignment to a Third Party, the Target
                                Exclusivity Obligations with respect to such
                                Collaboration Target shall continue until the
                                earlier of (a) receipt by CombiChem of a written
                                release from such Third Party, or (b) the
                                failure of such Third Party to exercise Due
                                Diligence with respect to that Target. Any
                                notice under this subsection 4.1(b) shall be
                                provided by ICOS to CombiChem promptly following
                                the relevant decision under subsections (1), (2)
                                or (3) above or failure under subsection (4)
                                above.

                4.2     Alternative Target Exclusivity. From the Effective Date
through *** CombiChem shall not work on, or provide services or advise, either
independently, or with any Third Parties (except where CombiChem is providing
its UIL to Third Parties without knowledge of such Third Parties' target),
except as provided for in Section 12.2 hereof with regard to any Public
Statements or (b) with respect to any Third Parties who are collaborators or
proposed collaborators of CombiChem, CombiChem shall have the right, consistent
with its corporate policy (but without identifying any Alternative Target), to
notify any such Third Party of its decision and/or inability to work on such
Alternative Target with that Third Party.

                4.3     Active Compound Exclusivity. Any Active Compound shall
be exclusively available to ICOS for research or application within or outside
the Collaboration, during the Research Period, and CombiChem shall not work on
or provide information regarding such Active Compound to any Third Party, except
to take any steps necessary to protect ICOS's exclusivity hereunder. Following
the expiration of the Research Period, Active Compounds for which a Patent has
not been filed within ninety (90) days following the Research Period shall be
deemed to be Inactive Compounds for all purposes hereunder; provided, that any
Active Compound which is the subject of claim(s) under a pending Collaboration
Patent shall continue to be treated as Active Compounds until a Collaboration
Patent is issued with respect to one or more of such claims; or until all of
such Patent claims have been denied and all appeals and refiling procedures have
been exhausted, at which time the compounds which are the subject of those
claims shall be Inactive Compounds hereunder.

                4.4     Inactive and Returned Compounds. Any Inactive Compounds
and Returned Compounds (subject to Section 9.2 hereof) shall be available to
CombiChem (except for any pre-existing ICOS Compound) and ICOS for any purpose.


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<PAGE>   12
                4.5     Survival. This Article 4 shall survive termination or
expiration of this Agreement.

        5.      COLLABORATION COMPOUNDS

                5.1     Pre-Existing Compounds or Other Pre-Existing Rights.
Neither Party shall have any rights then existing in the other Party to any
pre-existing compound of the other Party unless and until such compound is
designated as a Collaboration Compound by such Party. Additionally, CombiChem
may decline (after informing ICOS) to synthesize a particular compound or
library of compounds by written notice to ICOS of existing Patents, Patent
Applications and/or contractual obligations with Third Parties restricting
CombiChem's performance of such activities and such notice shall contain a
statement of warranty that such Patents, Patent Applications and/or contractual
obligations exist and that their existence and the obligations of CombiChem
predate an ICOS request of CombiChem to synthesize such compound or library of
compounds.

                5.2     Intellectual Property Rights; License to ICOS. Subject
to Section 9.2 hereof, and except as set forth in this Section 5.2, ICOS shall
have *** relating to Active Compounds, Development Compounds and Products and
the subject matter contained therein and resulting from the Research Program ***
 . ICOS shall be responsible for filing, maintaining and prosecuting all
Collaboration Patents at its sole expense and CombiChem shall use commercially
reasonable efforts to assist ICOS in filing such Collaboration Patent
applications. Prior to the filing of any such Collaboration Patent applications,
CombiChem shall assign to ICOS or its designee all intellectual property rights
it may have in *** and the subject matter claimed therein which are necessary
for the development and commercialization by ICOS or its designee; provided
under no circumstances does *** in any Active Compound, Development Compound or
Products are *** to the extent such Active Compound, Development Compound or
Products may be *** . If ICOS fails to so file, maintain or prosecute such
Collaboration Patent, CombiChem shall have the right to request ICOS to do so.
If ICOS elects not to file, maintain or prosecute such Collaboration Patent, on
a country-by-country basis, ICOS shall provide CombiChem with a fully-paid up
license so that CombiChem can take over such filing, maintenance or prosecution
of such Collaboration Patent, at its sole expense.

                5.3     Structural Information. Neither Party shall disclose the
structure of the other Party's compound, any Active Compound, Development
Compound or Product to any Third Party without the other Party's written
permission, unless required to do so by law, in which case such Party shall
promptly notify the other Party of such required disclosure. If a subpoena or
other legal process concerning the same is served upon either Party, the other
Party shall


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<PAGE>   13
cooperate with the Party served in any effort to contest the validity of such
subpoena or other legal process.

                5.4     Supply of Collaboration Compounds. Aliquots of *** of
any Collaboration Compound that has been synthesized will be prepared and given
to ICOS. CombiChem shall replenish that amount upon ICOS's reasonable request.
CombiChem shall maintain aliquots of any Collaboration Compound that has been
synthesized by CombiChem. CombiChem shall also provide ICOS with additional
requirements of samples at CombiChem's cost. To the extent that Collaboration
Compounds are not available in a timely and sufficient quantity to allow the
earliest start of necessary large scale preclinical or other studies such
unavailability of Collaboration Compounds shall not be cited as a lack of Due
Diligence provided that the Parties have made commercially reasonable attempts,
and continue such attempts, to provide such unavailable Collaboration Compounds
in required quantities in the most expedient manner.

        6.      RESEARCH MANAGEMENT COMMITTEE

        The design, review and conduct of the Research Program will be
coordinated by the Research Management Committee, which will meet regularly on a
mutually-agreeable schedule. Each Party shall bear its own expenses related to
such meetings. The Research Management Committee may establish and amend or
revise the Research Plan as reasonable and necessary to reflect the scientific
progress and work performed under the Research Program, such amendments to be
mutually agreed to in writing by ICOS and CombiChem. The Research Management
Committee will consist of an equal number of members from ICOS and CombiChem and
will include appropriate representatives from ICOS and CombiChem as mutually
agreed. The co-chairs of the Research Management Committee will initially be ***
and subsequently may change as each Party determines for its co-chair. Decisions
of the Research Management Committee shall be by consensus. If a decision is not
reached by the RMC with respect to management of the Research Program, the
dispute will be referred to the co-chairs of the RMC. If the co-chairs of the
RMC are unable to resolve the dispute, the dispute will be referred to the Chief
Executive Officer of CombiChem and the Chief Executive Officer of ICOS for
resolution. If those officers are unable to resolve the dispute, after good
faith discussions, the dispute shall be resolved first by a process of mediation
and then in the case of a failure to resolve the dispute, as determined per
Section 15.2 hereof. Any decisions, recommendations, amendments or performance
criteria agreed by consensus of the RMC which could, or may, materially affect
any obligations concerning consideration or ownership of intellectual property
shall be consistent with the terms of this Agreement and shall be ratified in
writing by both CombiChem and ICOS prior to it being binding on either party and
any performance or partial performance of an unratified agreement shall not be
construed as a waiver or acquiescence of the right of ratification.


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<PAGE>   14
        7.      RESEARCH PERIOD; TERMINATION OF RESEARCH PROGRAM

                7.1     Research Period: Option to Extend the Research Period.
The initial term of the Collaboration shall commence on the Effective Date and
conclude at the end of the Research Period, subject to extension upon mutual
agreement. To extend the Research Period, ICOS must notify CombiChem no later
than ninety (90) days prior to the then-current expiration date and the Parties
shall negotiate in good faith the terms and conditions of any such extension.

                7.2     Termination of Research Program Upon Breach. The
Research Program and/or this Agreement may be terminated by a Party for the
material breach by the other Party as provided by Section 10.2 hereof.

        8.      CONSIDERATION

                8.1     Fees.

                        (a)     As of the Effective Date, ICOS shall be
obligated to pay CombiChem a non-refundable, noncontingent project initiation
fee of U.S. *** in cash, by registered check or wire transfer, to initiate the
Research Program for the Initial Target within fifteen (15) days of the
Effective Date. Such initiation fee shall include payment for the *** made for
the Initial Target. Should ICOS request in writing a *** for any *** ICOS shall
pay CombiChem an additional U.S. *** for the *** and *** for *** for a total of
up to *** such *** . If any such request occurs after *** such *** shall only be
upon the mutual agreement of the Parties. The action of replacing an *** for an
*** pursuant to Section *** hereof shall not obligate ICOS to an additional ***
for such *** .

                8.2     Research Program Funding.

                        (a)     Research Support for Project Team. Beginning ***
,or earlier if mutually agreed by the Parties, and continuing throughout the
Research Period, ICOS shall make payments to CombiChem for direct research
support for its Project Team, which shall initially consist of *** full time
employees ("FTEs") of CombiChem, as modified by the RMC pursuant to Section
8.2(b) below. The total amount per FTE payable shall be U.S. *** per FTE per
annum, which amount shall be upwardly adjusted annually based on cumulative
changes in the CPI, using 1998 as the base year. All payments for direct
research support shall be paid by ICOS to CombiChem, quarterly in advance, and
adjusted as necessary in subsequent quarters, of such amounts as are equal to
the product of (i) the number of CombiChem FTEs allocated to the Research
Program by the RMC for the calendar quarter to which each such payment applies,
multiplied by (ii) U.S. *** (i.e., the quarterly amount per CombiChem FTE on the
basis of U.S. *** per annum).


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                                     - 13 -
<PAGE>   15
                        (b)     Expansion or Contraction of Project Team.
Notwithstanding Section 2.1(e) herein, either Party may request that CombiChem
expand or contract its Project Team during the Research Period in order to
properly regulate the work-flow on a Collaboration Target. In such event, the
RMC shall promptly confer as to the appropriate number of FTEs to be added to
the Project Team, at a cost to ICOS of U.S. *** per FTE as upwardly adjusted
annually based upon cumulative changes in the CPI, using 1998 as the base year,
to be paid as specified in Section 8.2(a) hereof and make a recommendation to
such expansion or contraction of the Project Team which recommendation may be
adopted by mutual written agreement of ICOS and CombiChem.

                8.3     Milestone Payments. Within thirty (30) days of the
occurrence of a development milestone triggered by the activities of ICOS or its
Affiliates as shown on Appendix A attached hereto, ICOS shall pay CombiChem the
related milestone payment in U.S. dollars as set forth on Appendix A attached
hereto. Such payments shall apply to any milestone reached by an Active
Compound, Development Compound or Product, for a Target within the
Collaboration.

                8.4     Royalties. During the Royalty Term, ICOS will pay
CombiChem an earned royalty of (i) *** of Net Sales of Products sold by ICOS,
its Affiliates or its sublicensees on the first *** of Net Sales made per
calendar year in *** and (ii) *** on any Net Sales of Products sold by ICOS, its
Affiliates or its sublicensees over *** made per calendar year in *** (iii) ***
of Net Sales of Products sold by ICOS, its Affiliates or its sublicensees on the
first *** of Net Sales made per calendar year *** and (iv) *** on any Net Sales
of Products sold by ICOS, its Affiliates or its sublicensees over *** made per
calendar year *** . Each payment of royalties shall be accompanied by a report
of Net Sales of Products in sufficient detail to permit confirmation of the
accuracy of the royalty payment made.

                        (a)     ICOS may reduce the percentage amount of earned
royalties payable for a Product under this Agreement by *** the amount in excess
of *** that ICOS decides, in its reasonable business judgment, to pay to third
parties who are not Affiliates or sublicensees of ICOS (not including any
royalties payable to CombiChem hereunder) in order to sell the Product to avoid
or settle a patent infringement action relating to *** under a Collaboration
Patent; provided however, that the royalties payable by ICOS to CombiChem for
the sale of Product shall not be reduced to less than *** the amount that ICOS
would otherwise be obligated to pay to CombiChem.

                        (b)     For any Product which is sold in combination
with any other active ingredient which other ingredient is not royalty bearing
hereunder (a "Combination Product"), Net Sales, for purposes of calculating
royalties, as defined in this Section 8.4, on a Combination Product, shall be
calculated by multiplying the net sales with respect to the Combination Product
determined in the same manner as Net Sales for a Product by the fraction A/B
where A is the gross selling price of the Product sold separately (i.e., without
the other active ingredients) and B is the gross selling price of the
Combination Product. In the event that no such separate sales


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                                     - 14 -
<PAGE>   16
are made, net sales value shall be calculated by multiplying net sales of the
Combination Product by the fraction C/(C + D), where C and D shall be negotiated
by the Parties in good faith prior to such sales.

                        (c)     Earned royalty shall be paid in the manner
provided herein on a country-by-country basis.

                8.5     Manner and Place of Payment. Royalty payments and
reports for Net Sales of Products shall be calculated in local currencies and
reported for each calendar quarter. All royalty payments owed under this
Agreement shall be made by wire transfer to the bank account to be designated by
CombiChem within sixty (60) days following the end of each such calendar
quarter.

                8.6     Records and Audit. During the term of this Agreement and
for a period of three (3) years thereafter, ICOS shall keep complete and
accurate records pertaining to the sale or other disposition of Products in
sufficient detail to permit CombiChem to confirm the accuracy of all payments
due hereunder. CombiChem shall have the right to cause an independent certified
public accounting firm reasonably acceptable to ICOS to audit such records to
confirm ICOS's Net Sales for the preceding year. Any information obtained during
such audit shall be treated as Confidential Information. Such audits may be
exercised after reasonable notice during normal business hours of ICOS no more
than once each year. CombiChem shall bear the full cost of such audit unless
such audit discloses a deficiency of the greater of U.S. $100,000 or more than
five percent (5%) from the amount of the Net Sales reported by ICOS for such
audited period. In such case, ICOS shall bear the reasonable cost of such audit.

                8.7     Taxes. All income and other taxes levied on account of
the royalties and other payments accruing to CombiChem under this Agreement
shall be paid by CombiChem, including taxes levied thereon as income to
CombiChem. If provision is made in law or regulation for withholding, such tax
shall be deducted from the royalty or other payment made by ICOS to the proper
taxing authority and a receipt of payment of the tax secured and promptly
delivered to CombiChem. Each Party agrees to assist the other Party reasonably
in claiming exemption from such deductions or withholdings under any double
taxation or similar agreement or treaty from time to time in force.

        9.      LICENSE GRANTS; SUBLICENSE

                9.1     CombiChem License Grant to ICOS. In addition to ICOS's
non-exclusive right to use CombiChem Technology as necessary to conduct
activities under the Research Program as described in Section 2.2 hereof,
subject to the terms and conditions of this Agreement, CombiChem hereby grants
to ICOS an exclusive, royalty-free, worldwide license, with the right to
sublicense to use such CombiChem Technology as is necessary to make, have made,
use, have used, sell, have sold, import and export Active Compounds, Development
Compounds and/or Products in the Territory. Such license shall remain exclusive
(including as to CombiChem) in relation to an Active Compound, Development
Compound and/or Product so


                                     - 15 -
<PAGE>   17
long as ICOS or its licensee continues to develop and commercialize such Active
Compound, Development Compound and/or Product against a Collaboration Target
with Due Diligence.

                9.2     ICOS License Grant to CombiChem. Subject to Article 4
hereof and following the decision of ICOS or its licensee to not develop and
commercialize with Due Diligence an Active Compound, a Development Compound or
Product, as the case may be (collectively, "Returned Compounds"), ICOS shall
grant to CombiChem a royalty-bearing license, with the right to sublicense,
under those Collaboration Patents and know-how which are resulting from the
Research Program and related exclusively to the Returned Compound, to make, have
made, use, have used, sell, have sold, import and export such Returned Compound
in the Territory. The royalty payments payable to ICOS for the license granted
to CombiChem pursuant to this Section 9.2 shall be identical to the royalty
payments provided for in Section 8.4 hereof (including the Royalty Term in
Section 1.35 hereof) substituting CombiChem for ICOS and ICOS for CombiChem. No
additional payments shall be due ICOS in consideration of the license grant
under this Section 9.2.

                9.3     ICOS Sublicense. ICOS shall have the right to transfer,
assign or sublicense to a Third Party the Products or Collaboration Patents
covering the Products, subject to CombiChem's right to receive all royalties and
milestone payments as provided in Sections 8.4 and 8.5 hereof. All payments
payable hereunder shall be made to CombiChem by wire transfer to such bank
account designated by CombiChem within five (5) business days after receipt by
ICOS or its Affiliates of such payments from a Third Party. As an express
condition of any such sublicense, any such licensee shall be required to agree
in writing (a) to be bound by due diligence, royalty reporting and recordkeeping
and inspection provisions no less stringent than those contained in this
Agreement and (b) to allow CombiChem to institute or join legal actions against
any ICOS sublicensee who fails to satisfy any obligations provided pursuant to
this Section 9.3. ICOS shall remain responsible to CombiChem for all milestone
and royalty payments actually received by ICOS from its sublicensees. In
addition, CombiChem shall have the right to receive all audit reports relating
to sales of Products of ICOS's sublicensees, and to cause ICOS or its Affiliates
or assigns to have an independent certified public accounting firm (reasonably
acceptable to ICOS) audit such sublicensee's records on the same terms as those
specified in Section 8.6 hereof.

                9.4     Rights to Inactive Compounds. Each Party shall be free
to screen Inactive Compounds against any target other than a Collaboration
Target. In the event that either ICOS or CombiChem shall develop, market and/or
sell, or enter into a binding agreement with a Third Party to develop, market
and/or sell, any product containing the Inactive Compound as an active
ingredient, then except to the extent that such Inactive Compound is subject of
a valid claim in a Patent or Collaboration Patent giving rights to the Party,
the other Party hereto shall not be entitled to any payments, milestones,
royalties, fees or compensation of any kind.


                                     - 16 -
<PAGE>   18
        10.     TERM AND TERMINATION OF THE AGREEMENT

                10.1    Term. The term of this Agreement shall commence upon the
Effective Date and unless earlier terminated as provided in this Agreement,
shall expire at the end of the Research Period.

                10.2    Termination by ICOS or CombiChem. If either Party
materially breaches this Agreement and fails to remedy that breach within ninety
(90) days of receiving written notice thereof from the other Party, or enters
into any arrangement of compromise with its creditors or goes into liquidation,
insolvency, bankruptcy, receivership or reorganization proceedings, whether
voluntarily or compulsorily which is not dismissed by a court of competent
jurisdiction within ninety (90) days, then the other Party may at any time, by
notice in writing or by facsimile transmission, terminate this Agreement. Within
ninety (90) days following termination for any Research Program and/or research
related to any Target under this Agreement, the RMC shall prepare a detailed,
final written report to each Party, and provide any remaining supply of
compounds in synthesis to date, for each Target or Research Program being
terminated.

                10.3    Termination by ICOS. ICOS may terminate this Agreement
effective at any time after *** from the Effective Date, in its sole discretion,
upon ninety (90) days' prior written notice.

                10.4    Termination by CombiChem. CombiChem may terminate this
Agreement effective at any time after *** from the Effective Date, in its sole
discretion, upon ninety (90) days' prior written notice. In the event that
CombiChem elects to terminate under this Section 10.4, CombiChem shall not work
on or provide services, or advice, either independently or with any Third Party
on any Collaboration Target for a period of *** from the date that the
termination is effective. No termination of this Agreement pursuant to this
Section 10.4 shall extend the Target Exclusivity Obligations set forth in
Section 4.1 hereof.

                10.5    After Termination. Any termination of this Agreement or
the Research Program shall be without prejudice to the accrued rights of either
Party prior to the termination. In case of termination of this Agreement or the
Research Program pursuant to Sections 10.2, 10.3 or 10.4 above, all royalty,
milestone, payment and confidentiality obligations set forth in Sections 8.1,
8.4, 8.5, 9.3, 9.4 hereof and Articles 11 and 12 hereof shall survive any such
termination. Moreover, ICOS shall not be entitled to any refund of any payments
made to CombiChem hereunder upon the expiration of the term of this Agreement or
earlier termination pursuant to this Article 10.

                10.6    Effect of Termination on Licensees. In the event of any
termination of this Agreement pursuant to this Article 10 where such termination
shall not have been caused by the action or inaction on the part of any
respective licensee of ICOS or CombiChem, or by any breach by such licensee of
its obligations under its license from ICOS or CombiChem, as appropriate, such
termination of this Agreement shall be without prejudice to the rights of each
non-breaching licensee and such licensee shall be deemed to be a direct licensee
hereunder.


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        11.     CONFIDENTIAL INFORMATION

                11.1    Nondisclosure. During the term of this Agreement and for
a period of *** years after termination or expiration thereof, each Party will
maintain all Confidential Information in trust and confidence and will not
disclose any Confidential Information to any third party or use any Confidential
Information for any purpose except (i) as expressly authorized by this
Agreement, (ii) as required by law or court order, after as much advance notice
as is practical to the other Party, (iii) to its consultants, subcontractors or
agents who need to know to accomplish the purposes of this Agreement and who are
bound by equivalent written confidentiality obligations. Each Party may use the
other Party's Confidential Information only to the extent required to accomplish
the purposes of this Agreement. Each Party will use at least the same standard
of care as it uses to protect proprietary or confidential information of its own
to ensure that its Affiliates, employees, agents, consultants and other
representatives do not disclose or make any unauthorized use of the Confidential
Information. Each Party will promptly notify the other upon discovery of any
unauthorized use or disclosure of the Confidential Information.

                11.2    Exceptions. Confidential Information shall not include
any information which the receiving Party can prove by competent evidence: (a)
is now, or hereafter becomes, through no act or failure to act on the part of
the receiving Party, generally known or available; (b) is known by the receiving
Party at the time of receiving such information, as evidenced by its written
records; (c) is hereafter disclosed to the receiving Party by a Third Party, as
a matter of right and without restriction on disclosure; (d) is independently
developed by the receiving Party without the aid, application or use of
Confidential Information; or (e) is the subject of a written permission to
disclose provided by the disclosing Party.

        12.     PUBLICATIONS AND PUBLIC STATEMENTS

                12.1    Publications. Without affecting obligations under
Article 11 above, neither Party shall publish any information with respect to
Collaboration Compounds or Development Compound during the Exclusivity Period
without the prior written permission of the other Party. Such permission shall
be approved or disapproved within thirty (30) days of written request for
permission unless the other Party requests additional time (not to exceed ninety
(90) days) for the purpose of protecting its intellectual property position.
Such permission shall not be unreasonably withheld. The Party proposing to
publish such information shall give the other Party ninety (90) days prior
written notice and an opportunity to review such manuscript in order to
determine the patentability of the information contained therein.

                12.2    Public Statements. Neither Party shall use the name of
the other Party in any public statement, prospectus, annual report or press
release or other public communication (collectively "Public Statements") (except
to the extent that use of the name is required for disclosure by the Securities
and Exchange Commission or other governmental rules or regulations) without the
prior written approval of the other Party, which may not be unreasonably
withheld or delayed; provided, however, that both Parties shall endeavor in good
faith to give the other Party a minimum of two (2) business days to review such
Public Statements; provided,


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<PAGE>   20
further, that, upon approval of any such Public Statement, both Parties may
disclose to Third Parties the information contained in such Public Statement
without the further approval of the other; and provided, further, that if a
Party does not approve such Public Statement, either Party may still use the
name of the other Party in any Public Statement without the prior written
approval of the other Party, if such Party is advised by counsel that such
disclosure is required to comply with applicable law.

        13.     INDEMNIFICATION

                13.1    EACH PARTY HEREBY AGREES TO SAVE, DEFEND AND HOLD THE
OTHER PARTY AND ITS OFFICERS, DIRECTORS, EMPLOYEES, CONSULTANTS AND AGENTS
HARMLESS FROM AND AGAINST ANY AND ALL SUITS, CLAIMS, ACTIONS, DEMANDS,
LIABILITIES, EXPENSES AND LOSSES, INCLUDING REASONABLE LEGAL EXPENSES AND
ATTORNEYS' FEES ("LOSSES") RESULTING DIRECTLY OR INDIRECTLY FROM THE
INDEMNIFYING PARTY'S ACTS OR OMISSIONS IN CONNECTION WITH THE MANUFACTURE,
DEVELOPMENT, USE, HANDLING, STORAGE, SALE OR OTHER DISPOSITION OF CHEMICAL
AGENTS, COLLABORATION COMPOUNDS, ACTIVE COMPOUNDS, DEVELOPMENT COMPOUNDS OR
PRODUCTS BY SUCH PARTY, ITS AFFILIATES OR LICENSEES except to the extent such
Losses result from the negligence (whether active, passive or imputed), breach
of this Agreement or willful misconduct of the Party claiming a right of
indemnification under this Article 13.

                13.2    Infringement

                        (a)     Subject to Section 13.2(c) below, ICOS shall
hold CombiChem and its officers, directors, employees, consultants, and agents
harmless from and against any and all losses resulting from the infringement of
any Third Party's Patent issued as of the Effective Date due to the performance
by ICOS or its Affiliates of any activity contemplated hereunder, including, but
not necessarily limited to, ICOS's responsibilities under Section 2.2 above,
developing Products, and selling Products.

                        (b)     Subject to Section 13.2(c) below, CombiChem
shall hold ICOS and its officers, directors, employees, consultants, and agents
harmless from and against any and all losses resulting from the infringement of
any Third Party's Patent issued as of the Effective Date due to the performance
by CombiChem of any activity contemplated hereunder, including, but not
necessarily limited to, CombiChem's responsibilities under Section 2.1 above.

                        (c)     The indemnity provided in Sections 13.2(a) and
13.2(b) above shall not apply where the loss is due to the breach by the
indemnified Party of a warranty made in Article 19.

                13.3    Procedures. If either Party (the "Indemnified Party")
seeks indemnification under this Article 13, it shall inform the other Party
(the "Indemnifying Party") of a claim as soon as reasonably practicable after it
receives notice of the claim, shall permit the Indemnifying Party to assume
direction and control of the defense of the claim (including the right to settle
any claim


                                     - 19 -
<PAGE>   21
brought against the Indemnified Party upon prior written consent, which shall
not be unreasonably withheld), and shall give reasonable cooperation (at the
expense of the Indemnifying Party) in the defense of such claim.

        14.     ASSIGNABILITY

        This Agreement may not be assigned by either Party without the prior
written consent of the other Party, not to be unreasonably withheld; provided,
however, that either Party may assign this Agreement, in whole or in part, to an
Affiliate or to a successor of a Party in connection with the merger,
consolidation or sale of all or substantially all of such Party's assets or that
portion of its business pertaining to the subject matter of this Agreement (and
upon doing so will promptly notify the other Party in writing); provided that
the assigning Party remains fully liable as obligated hereunder.

        15.     DISPUTE RESOLUTION PROCEDURES

                15.1    Senior Executives Discussions. If a decision on a matter
regarding the management of the Research Program as provided herein is not
reached by the RMC, the dispute will be resolved as set forth in Article 6
above. If a dispute arises between CombiChem and ICOS with respect to matters
other than the management of the Research Program, either during or after the
Research Period, such dispute will be referred to the appropriate senior
management in the area of the dispute. If such senior management are unable to
resolve such dispute, such dispute will be referred to the Chief Executive
Officer of ICOS and the Chief Executive Officer of CombiChem. If such officers
are unable to reach an agreement within thirty (30) days following the
initiation of discussions between them, such dispute shall be submitted to
mediation and if there is no settlement of the dispute within sixty (60) days
following the commencement of such mediation process, such dispute may, at the
Party's mutual written agreement, be settled by arbitration as described in
Section 15.2 below.

                15.2    Binding Arbitration. If the Parties have not been able
to resolve the dispute as provided in Section 15.1 above and the Parties
mutually agree in writing, the dispute shall be finally settled by binding
arbitration. Any arbitration hereunder shall be conducted under rules of the
American Arbitration Association. The arbitration shall be conducted before
three arbitrators chosen according to the following procedure: each of the
parties shall appoint one arbitrator and the two so nominated shall choose the
third. If the arbitrators chosen by the parties cannot agree on the choice of
the third arbitrator within a period of thirty (30) days after their
appointment, then the third arbitrator shall be appointed by the Court of
Arbitration of the American Arbitration Association. If CombiChem brings an
arbitration action, such arbitration shall occur in Seattle, Washington. If ICOS
brings an arbitration action, such arbitration shall occur in San Diego,
California. The arbitrators shall have the authority to grant specific
performance, and to allocate between the parties the costs of arbitration in
such equitable manner as they determine. The arbitral award (i) shall be final
and binding upon the parties; and (ii) may be entered in any court of competent
jurisdiction.


                                     - 20 -
<PAGE>   22
                15.3    Injunctive and Other Relief. Nothing contained in this
Article 15 or any other provisions of this Agreement shall be construed to limit
or preclude a Party from bringing any action in any court of competent
jurisdiction for injunctive or other provisional relief to compel the other
Party to comply with its obligations hereunder before or during the pendency of
arbitration proceedings. In the event that the Parties do not mutually agree to
enter binding arbitration as provided in Section 15.2 hereof, the Parties may
pursue all available legal remedies.

        16.     NOTICES

        Any notice required or permitted to be given hereunder shall be deemed
sufficient if sent by facsimile letter or overnight courier, or delivered by
hand to ICOS or CombiChem at the respective addresses and facsimile numbers as
set forth below or at such other address and facsimile number as either Party
hereto may designate. If sent by facsimile letter, notice shall be deemed given
when the transmission is completed if the sender has a confirmed transmission
report. If a confirmed transmission report does not exist, then the notice will
be deemed given when the notice is actually received by the person to whom it is
sent. If delivered by overnight courier, notice shall be deemed given when it
has been signed for. If delivered by hand, notice shall be deemed given when
received.

        if to CombiChem, to:
                                CombiChem, Inc.
                                9050 Camino Santa Fe
                                San Diego, California 92121
                                Attention: President
                                Fax number: (619) 530-9998

            with a copy to:
                                Brobeck, Phleger & Harrison LLP
                                550 West C Street, Suite 1200
                                San Diego, California 92101
                                Attention: Faye H. Russell, Esq.
                                Fax number: (619) 234-1966


                                     - 21 -
<PAGE>   23
        if to ICOS to:
                                ICOS Corporation
                                22021 20th Avenue, S.E.
                                Bothell, Washington  98021
                                Attention:  Legal Department
                                Fax number:  (425) 489-0356

        17.     SURVIVAL

        The provisions of Sections 2.4, 5.1, 5.2, 5.3, 10.5, 10.6 and Articles
4, 8, 9, 11, 12, 13, 15, and this Article 17 shall survive termination of this
Agreement in addition to those provisions which by their terms survive.

        18.     ADDITIONAL TERMS

                18.1    Entire Agreement. This Agreement constitutes the entire
understanding between the Parties with respect to the subject matter hereto and
supersedes and replaces all previous negotiations, understandings,
representations, writings and contract provisions and rights relating hereof.

                18.2    Amendment; No Waiver. No provision of this Agreement may
be amended, revoked or waived except by a writing signed and delivered by an
authorized officer of each Party. Any waiver on the part of either Party of any
breach or any fight or interest hereunder shall not imply the waiver of any
subsequent breach or waiver of any other right or interest.

                18.3    Validity. The invalidity or unenforceability of any
provision of this Agreement shall not affect the validity or enforceability of
any other provision of this Agreement, each of which shall remain in full force
and effect.

                18.4    Headings. The descriptive headings are inserted for
convenience of reference only and are not intended to be part of or to affect
the meaning of or interpretation of this Agreement.

                18.5    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.

                18.6    Further Assurances. At any time and from time to time
after the Effective Date, the Parties shall each do, execute, acknowledge and
deliver, and cause to be done, executed, acknowledged or delivered, all such
further acts, transfers, conveyances, or assignments as may be reasonably
required to carry out the transactions contemplated by this Agreement.

        19.     REPRESENTATIONS AND WARRANTIES

                19.1    Authorization. All action on the part of each of
CombiChem, ICOS and their respective officers, and directors necessary for the
authorization, execution and delivery of this


                                     - 22 -
<PAGE>   24
Agreement and the performance of all obligations of CombiChem, ICOS and ICOS,
respectively, hereunder has been taken.

                19.2    Rights to Intellectual Property. Each Party warrants
that it has the power to grant all of the rights granted and make such required
assignments, and to assume all of the obligations required, under this
Agreement. Under no circumstances does CombiChem warrant to ICOS that its rights
in any Active Compound, Development Compound or Products are exclusive to the
extent such Active Compound, Development Compound or Products may be covered
under the patent claims of Third Parties wherein such claims are not the direct
result of a collaboration between the Third Party and CombiChem.





                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]


                                     - 23 -
<PAGE>   25
        IN WITNESS WHEREOF, the parties have executed this Agreement to be
effective as of the Effective Date.

COMBICHEM, INC.                     ICOS CORPORATION

By:  /s/ Illegible                  By:  /s/ Illegible
     ----------------------------        --------------------------------

Its:  Illegible                     Its:  Illegible
      ---------------------------         -------------------------------








                        [SIGNATURE PAGE TO COLLABORATIVE
                         RESEARCH AND LICENSE AGREEMENT]


                                     - 24 -
<PAGE>   26
                                   Appendix A


                           Milestones and Payments(1)
                                (in U.S. Dollars)


Milestone                                  Milestone Payment(2)
- ---------                                  --------------------


***                                                  ***



Total                                                ***



(1)     Paid in U.S. Dollars
        ***


***     Portions of this page have been omitted pursuant to a request for
        Confidential Treatment and filed separately with the Commission.


                                  Appendix A-1
<PAGE>   27
                                   Appendix B


                                            Targets
                                            -------

Initial Target:                                ***

Alternative Targets:                           ***


***     Portions of this page have been omitted pursuant to a request for
        Confidential Treatment and filed separately with the Commission.


                                  Appendix B-1

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AND STATEMENTS OF OPERATIONS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   12-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1998
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1998
<PERIOD-END>                               SEP-30-1997             DEC-31-1997             MAR-31-1998
<CASH>                                           8,402                  16,921                  14,488
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                        0                     528                   1,922
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                 8,920                  18,479                  17,567
<PP&E>                                           4,080                   5,961                   7,124
<DEPRECIATION>                                     982                   1,272                   1,600
<TOTAL-ASSETS>                                  13,363                  25,526                  25,926
<CURRENT-LIABILITIES>                            3,632                   5,320                   5,998
<BONDS>                                              0                       0                       0
                           23,130                  23,130                  23,130
                                          0                       0                       0
<COMMON>                                         1,978                  12,523                  12,523
<OTHER-SE>                                     (1,662)                 (2,001)                 (1,891)
<TOTAL-LIABILITY-AND-EQUITY>                    13,363                  25,526                  25,926
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                                 4,599                   7,471                   3,372
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                        0                       0                       0
<OTHER-EXPENSES>                                 8,341                  12,003                   4,130
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                               (293)                   (252)                   (121)
<INCOME-PRETAX>                                (3,669)                 (4,322)                   (674)
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                            (3,669)                 (4,322)                   (674)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                   (3,669)                 (4,322)                   (674)
<EPS-PRIMARY>                                   (1.24)                  (0.49)                  (0.07)
<EPS-DILUTED>                                   (1.24)                  (0.49)                  (0.07)
        

</TABLE>


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