PAIN THERAPEUTICS INC
S-1/A, EX-1.1, 2000-06-20
PHARMACEUTICAL PREPARATIONS
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                                                                     Exhibit 1.1



                                5,000,000 SHARES



                             PAIN THERAPEUTICS, INC.

                                  COMMON STOCK



                             UNDERWRITING AGREEMENT


                               DATED _____________



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                             UNDERWRITING AGREEMENT


                                     [Date]


Thomas Weisel Partners LLC
CIBC World Markets Corp.
Tucker Anthony Incorporated
        As Representatives of the several Underwriters
c/o Thomas Weisel Partners LLC
One Montgomery Street, Suite 3700
San Francisco, California  94104

Ladies and Gentlemen:

               INTRODUCTORY. Pain Therapeutics, Inc., a Delaware corporation
(the "Company"), proposes to issue and sell to the several underwriters named in
Schedule A (the "Underwriters") an aggregate of 5,000,000 shares (the "Firm
Shares") of its Common Stock, par value $0.001 per share (the "Common Shares").
In addition, the Company has granted to the Underwriters an option to purchase
up to an additional 750,000 Common Shares (the "Option Shares") as provided in
Section 2. The Firm Shares and, if and to the extent such option is exercised,
the Option Shares are collectively called the "Shares." Thomas Weisel Partners
LLC ("Thomas Weisel Partners"), CIBC World Markets Corp. and Tucker Anthony
Incorporated have agreed to act as representatives of the several Underwriters
(in such capacity, the "Representatives") in connection with the offering and
sale of the Shares. As a part of the offering contemplated by this Agreement,
Thomas Weisel Partners has agreed to reserve out of the Shares set forth
opposite its name on the Schedule A to this Agreement, up to 250,000 shares, for
sale to the Company's employees, officers, and directors and other parties
associated with the Company (collectively, "Participants"), as set forth in the
Prospectus under the heading "Underwriting" (the "Directed Share Program"). The
Shares to be sold by Thomas Weisel Partners pursuant to the Directed Share
Program (the "Directed Shares") will be sold by Thomas Weisel Partners pursuant
to this Agreement at the public offering price. Any Directed Shares not orally
confirmed for purchase by any Participants as of the end of the first business
day after the date on which this Agreement is executed will be offered to the
public by Thomas Weisel Partners as set forth in the Prospectus.

               The Company has prepared and filed with the Securities and
Exchange Commission (the "Commission") a registration statement on Form S-1
(File No. 333-32370), which contains a form of prospectus, subject to
completion, to be used in connection with the public offering and sale of the
Shares. Each such prospectus, subject to completion, used in connection with
such public offering is called a "preliminary prospectus." Such registration
statement, as amended, including the financial statements, exhibits and
schedules thereto, in the form in which it was declared effective by the
Commission under the Securities Act of 1933, as amended, and the rules and
regulations promulgated thereunder (collectively, the "Securities Act"),
including any information deemed to be a part thereof at the time of
effectiveness


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pursuant to Rule 430A under the Securities Act, is called the "Registration
Statement." Any registration statement filed by the Company pursuant to Rule
462(b) under the Securities Act is called the "Rule 462(b) Registration
Statement," and from and after the date and time of filing of the Rule 462(b)
Registration Statement the term "Registration Statement" shall include the Rule
462(b) Registration Statement. Such prospectus, in the form first used by the
Underwriters to confirm sales of the Shares, is called the "Prospectus," which
term shall be deemed to include the "electronic Prospectus" provided by the
Company for use in connection with the offering of the Shares as contemplated by
Section 3(e) of this Agreement. All references in this Agreement to the
Registration Statement, the Rule 462(b) Registration Statement, a preliminary
prospectus, the Prospectus, or any amendments or supplements to any of the
foregoing, shall include any copy thereof filed with the Commission pursuant to
its Electronic Data Gathering, Analysis and Retrieval System ("EDGAR").

               The Company hereby confirms its agreements with the Underwriters
as follows:


        SECTION 1. REPRESENTATIONS AND WARRANTIES.

               The Company hereby represents, warrants and covenants to each
Underwriter as follows:

        (a) Compliance with Registration Requirements. The Registration
Statement and any Rule 462(b) Registration Statement have been declared
effective by the Commission under the Securities Act. The Company has complied
to the Commission's satisfaction with all requests of the Commission for
additional or supplemental information. No stop order suspending the
effectiveness of the Registration Statement or any Rule 462(b) Registration
Statement is in effect and no proceedings for such purpose have been instituted
or are pending or, to the best knowledge of the Company, are contemplated or
threatened by the Commission.

               Each preliminary prospectus and the Prospectus when filed
complied in all material respects with the Securities Act and, if filed by
electronic transmission pursuant to EDGAR (except as may be permitted by
Regulation S-T under the Securities Act), was identical to the copy thereof
delivered to the Underwriters for use in connection with the offer and sale of
the Shares. Each of the Registration Statement, any Rule 462(b) Registration
Statement and any post-effective amendment thereto, at the time it became
effective and at all subsequent times, complied and will comply in all material
respects with the Securities Act and did not and will not contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein not misleading. Each
preliminary prospectus, as of its date, and the Prospectus, as amended or
supplemented, as of its date and at all subsequent times through the 30th day
after the date hereof, did not and will not contain any untrue statement of a
material fact or omit to state a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading. The representations and warranties set forth in the two
immediately preceding sentences do not apply to statements in or omissions from
the Registration Statement, any Rule 462(b) Registration Statement, or any
post-effective amendment thereto, or the Prospectus, or any amendments or
supplements thereto, made in reliance upon and in conformity with information
relating to any Underwriter furnished to the Company in writing by the
Representatives expressly for use therein. There are no contracts or other
documents required to be described in the Prospectus or to be filed as exhibits
to the Registration Statement which have not been described or filed as
required.


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        (b) Offering Materials Furnished to Underwriters. The Company has
delivered to the Representatives one complete conformed copy of the Registration
Statement and of each consent and certificate of experts filed as a part
thereof, and conformed copies of the Registration Statement (without exhibits)
and preliminary prospectuses and the Prospectus, as amended or supplemented, in
such quantities and at such places as the Representatives have reasonably
requested for each of the Underwriters.

        (c) Distribution of Offering Material By the Company. The Company has
not distributed and will not distribute, prior to the later of the Second
Closing Date (as defined below) and the completion of the Underwriters'
distribution of the Shares, any offering material in connection with the
offering and sale of the Shares other than a preliminary prospectus, the
Prospectus or the Registration Statement.

        (d) The Underwriting Agreement. This Agreement has been duly authorized,
executed and delivered by, and is a valid and binding agreement of, the Company,
enforceable in accordance with its terms, except as rights to indemnification
hereunder may be limited by applicable law and except as the enforcement hereof
may be limited by bankruptcy, insolvency, reorganization, moratorium or other
similar laws relating to or affecting the rights and remedies of creditors or by
general equitable principles.

        (e) Authorization of the Shares. The Shares to be purchased by the
Underwriters from the Company have been duly authorized for issuance and sale
pursuant to this Agreement and, when issued and delivered by the Company
pursuant to this Agreement, will be validly issued, fully paid and
nonassessable.

        (f) No Applicable Registration or Other Similar Rights. There are no
persons with registration or other similar rights to have any equity or debt
securities registered for sale under the Registration Statement or included in
the offering contemplated by this Agreement, except for such rights as have been
duly waived.

        (g) No Material Adverse Change. Subsequent to the respective dates as of
which information is given in the Prospectus: (i) there has been no material
adverse change, or any development that could reasonably be expected to result
in a material adverse change, in the condition, financial or otherwise, or in
the earnings, business, operations or prospects, whether or not arising from
transactions in the ordinary course of business, of the Company (any such change
or effect, where the context so requires, is called a "Material Adverse Change"
or a "Material Adverse Effect"); (ii) the Company has not incurred any material
liability or obligation, indirect, direct or contingent, not in the ordinary
course of business nor entered into any material transaction or agreement not in
the ordinary course of business; and (iii) there has been no dividend or
distribution of any kind declared, paid or made by the Company on any class of
capital stock or repurchase or redemption by the Company of any class of capital
stock.

        (h) Independent Accountants. KPMG LLP who have expressed their opinion
with respect to the financial statements (which term as used in this Agreement
includes the related notes thereto) and supporting schedules filed with the
Commission as a part of the Registration Statement and included in the
Prospectus, are independent public or certified public accountants as required
by the Securities Act.

        (i) Preparation of the Financial Statements. The financial statements
filed with the Commission as a part of the Registration Statement and included
in the Prospectus present fairly the financial position of the Company as of and
at the dates indicated and the results of its


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operations and cash flows for the periods specified. The supporting schedules
included in the Registration Statement present fairly the information required
to be stated therein. Such financial statements and supporting schedules have
been prepared in conformity with generally accepted accounting principles
applied on a consistent basis throughout the periods involved, except as may be
expressly stated in the related notes thereto. No other financial statements or
supporting schedules are required to be included in the Registration Statement.
The financial data set forth in the Prospectus under the captions
"Summary--Summary Selected Financial Data," "Selected Financial Data" and
"Capitalization" fairly present the information set forth therein on a basis
consistent with that of the audited financial statements contained in the
Registration Statement. The pro forma financial information included under the
caption "Prospectus Summary--Summary Financial Data" and "Capitalization" and
elsewhere in the Prospectus and in the Registration Statement present fairly the
information contained therein, have been prepared in accordance with the
Commission's rules and guidelines with respect to pro forma financial statements
and have been properly presented on the bases described therein, and the
assumptions used in the preparation thereof are reasonable and the adjustments
used therein are appropriate to give effect to the transactions and
circumstances referred to therein. No other pro forma financial information is
required to be included in the Registration Statement Pursuant to Regulation
S-X.

        (j) Company's Accounting System. The Company maintains a system of
accounting controls sufficient to provide reasonable assurances that (i)
transactions are executed in accordance with management's general or specific
authorization; (ii) transactions are recorded as necessary to permit preparation
of financial statements in conformity with generally accepted accounting
principles and to maintain accountability for assets; (iii) access to assets is
permitted only in accordance with management's general or specific
authorization; and (iv) the recorded accountability for assets is compared with
existing assets at reasonable intervals and appropriate action is taken with
respect to any differences.

        (k) Subsidiaries of the Company. The Company has no subsidiaries and
does not own or control, directly or indirectly, any corporation, association or
other entity.

        (l) Incorporation and Good Standing of the Company. The Company has been
duly organized and is validly existing as a corporation in good standing under
the laws of the State of Delaware with full corporate power and authority to own
its properties and conduct its business as described in the prospectus, and is
duly qualified to do business as a foreign corporation and is in good standing
under the laws of each jurisdiction which requires such qualification.

        (m) Capitalization and Other Capital Stock Matters. The authorized,
issued and outstanding capital stock of the Company is as set forth in the
Prospectus under the caption "Capitalization" (other than for subsequent
issuances, if any, pursuant to employee benefit plans described in the
Prospectus or upon exercise of outstanding options or warrants described in the
Prospectus). The Common Shares (including the Shares) conform in all material
respects to the description thereof contained in the Prospectus. All of the
issued and outstanding Common Shares have been duly authorized and validly
issued, are fully paid and nonassessable and have been issued in compliance with
federal and state securities laws. None of the outstanding Common Shares were
issued in violation of any preemptive rights, rights of first refusal or other
similar rights to subscribe for or purchase securities of the Company. There are
no authorized or outstanding options, warrants, preemptive rights, rights of
first refusal or other rights to purchase, or equity or debt securities
convertible into or exchangeable or exercisable for, any capital stock of the
Company other than those accurately described in the Prospectus. The description
of the Company's stock option, stock bonus and other stock plans or
arrangements,


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and the options or other rights granted thereunder, set forth in the Prospectus
accurately and fairly presents the information required to be shown with respect
to such plans, arrangements, options and rights.

        (n) Stock Exchange Listing. The Shares have been approved for inclusion
on the Nasdaq National Market, subject only to official notice of issuance.

        (o) No Consents, Approvals or Authorizations Required. No consent,
approval, authorization, filing with or order of any court or governmental
agency or regulatory body is required in connection with the transactions
contemplated herein, except such as have been obtained or made under the
Securities Act and such as may be required (i) under the blue sky laws of any
jurisdiction in connection with the purchase and distribution of the Shares by
the Underwriters in the manner contemplated here and in the Prospectus, (ii) by
the National Association of Securities Dealers, Inc. (together with its
regulatory subsidiary, NASD Regulation, Inc., the "NASD") and (iii) by the
federal and provincial laws of Canada.

        (p) Non-Contravention of Existing Instruments Agreements. Neither the
issue and sale of the Shares nor the consummation of any other of the
transactions herein contemplated nor the fulfillment of the terms hereof will
conflict with, result in a breach or violation or imposition of any lien, charge
or encumbrance upon any property or assets of the Company pursuant to, (i) the
charter or by-laws of the Company, (ii) the terms of any indenture, contract,
lease, mortgage, deed of trust, note agreement, loan agreement or other
agreement, obligation, condition, covenant or instrument to which the Company is
a party or bound or to which its property is subject or (iii) any statute, law,
rule, regulation, judgment, order or decree applicable to the Company of any
court, regulatory body, administrative agency, governmental body, arbitrator or
other authority having jurisdiction over the Company or any of its properties.

        (q) No Defaults or Violations. The Company is not in violation or
default of (i) any provision of its charter or by-laws, (ii) the terms of any
indenture, contract, lease, mortgage, deed of trust, note agreement, loan
agreement or other agreement, obligation, condition, covenant or instrument to
which it is a party or bound or to which its property is subject or (iii) any
statute, law, rule, regulation, judgment, order or decree of any court,
regulatory body, administrative agency, governmental body, arbitrator or other
authority having jurisdiction over the Company or any of its properties, except
any such violation or default which would not, singly or in the aggregate,
result in a Material Adverse Change except as otherwise disclosed in the
Prospectus.

        (r) No Actions, Suits or Proceedings. No action, suit or proceeding by
or before any court or governmental agency, authority or body or any arbitrator
involving the Company or its property is pending or, to the best knowledge of
the Company, threatened that (i) could reasonably be expected to have a Material
Adverse Effect on the performance of this Agreement or the consummation of any
of the transactions contemplated hereby or (ii) could reasonably be expected to
result in a Material Adverse Effect.

        (s) All Necessary Permits, Etc. Except as otherwise disclosed in the
Prospectus, The Company possesses such valid and current certificates,
authorizations or permits issued by the appropriate state, federal or foreign
regulatory agencies or bodies necessary to conduct its business, and the Company
has not received any notice of proceedings relating to the revocation or
modification of, or non-compliance with, any such certificate, authorization or
permit which, singly or in the aggregate, if the subject of an unfavorable
decision, ruling or finding, could result in a Material Adverse Change.


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        (t) License Agreement. The License Agreement, dated May 5, 1998 by and
between the Company and Albert Einstein College of Medicine has been duly
authorized by all necessary corporate action on the part of the Company and has
been duly executed and delivered by the Company and, assuming due authorization,
execution and delivery by Albert Einstein College of Medicine, is a valid and
binding agreement of Albert Einstein College of Medicine, enforceable in
accordance with its terms.

        (u) Title to Properties. The Company has good and marketable title to
all the properties and assets reflected as owned in the financial statements
referred to in Section 1(i) above (or elsewhere in the Prospectus), in each case
free and clear of any security interests, mortgages, liens, encumbrances,
equities, claims and other defects, except such as do not materially and
adversely affect the value of such property and do not materially interfere with
the use made or proposed to be made of such property by the Company. The real
property, improvements, equipment and personal property held under lease by the
Company are held under valid and enforceable leases, with such exceptions as are
not material and do not materially interfere with the use made or proposed to be
made of such real property, improvements, equipment or personal property by the
Company.

        (v) Tax Law Compliance. The Company has filed all necessary federal,
state and foreign income and franchise tax returns and has paid all taxes
required to be paid by it and, if due and payable, any related or similar
assessment, fine or penalty levied against any it. The Company has made adequate
charges, accruals and reserves in the applicable financial statements referred
to in Section 1(i) above in respect of all federal, state and foreign income and
franchise taxes for all periods as to which the tax liability of the Company has
not been finally determined. The Company is not aware of any tax deficiency that
has been or might be asserted or threatened against the Company that could
result in a Material Adverse Change.

        (w) Intellectual Property Rights. The Company owns or possesses adequate
rights to use all patents, patent rights or licenses, inventions, collaborative
research agreements, trade secrets, know-how, trademarks, service marks, trade
names and copyrights which are necessary to conduct its businesses as described
in the Registration Statement and Prospectus. The expiration of any patents,
patent rights, trade secrets, trademarks, service marks, trade names or
copyrights would not result in a Material Adverse Change that is not otherwise
disclosed in the Prospectus. The Company has not received any notice of, and has
no knowledge of, any infringement of or conflict with asserted rights of the
Company by others with respect to any patent, patent rights, inventions, trade
secrets, know-how, trademarks, service marks, trade names or copyrights; and the
Company has not received any notice of, and has no knowledge of, any
infringement of or conflict with asserted rights of others with respect to any
patent, patent rights, inventions, trade secrets, know-how, trademarks, service
marks, trade names or copyrights which, singly or in the aggregate, if the
subject of an unfavorable decision, ruling or finding, might have a Material
Adverse Change. There is no claim being made against the Company regarding
patents, patent rights or licenses, inventions, collaborative research, trade
secrets, know-how, trademarks, service marks, trade names or copyrights. The
Company does not in the conduct of its business as now or proposed to be
conducted as described in the Prospectus infringe or conflict with any right or
patent of any third party, or any discovery, invention, product or process which
is the subject of a patent application filed by any third party, known to the
Company, which such infringement or conflict is reasonably likely to result in a
Material Adverse Change.

        (x) Year 2000. There are no Year 2000 issues related to the Company that
(i) are of a character required to be described or referred to in the
Registration Statement or Prospectus by


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the Securities Act which have not been accurately described in the Registration
Statement or Prospectus or (ii) might reasonably be expected to result in any
Material Adverse Change or that might materially affect their properties, assets
or rights.

        (y) No Transfer Taxes or Other Fees. There are no transfer taxes or
other similar fees or charges under Federal law or the laws of any state, or any
political subdivision thereof, required to be paid in connection with the
execution and delivery of this Agreement or the issuance and sale by the Company
of the shares.

        (z) Company Not an "Investment Company". The Company has been advised of
the rules and requirements under the Investment Company Act of 1940, as amended
(the "Investment Company Act"). The Company is not, and after receipt of payment
for the Shares will not be, an "investment company" or an entity "controlled" by
an "investment company" within the meaning of the Investment Company Act and
will conduct its business in a manner so that it will not become subject to the
Investment Company Act.

        (aa) Insurance. Except as otherwise disclosed in the Prospectus, the
Company is insured by recognized, financially sound and reputable institutions
with policies in such amounts and with such deductibles and covering such risks
as are generally deemed adequate and customary for its business including, but
not limited to, policies covering real and personal property owned or leased by
the Company against theft, damage, destruction, acts of vandalism and
earthquakes, general liability and Directors and Officers liability. The Company
has no reason to believe that it will not be able (i) to renew its existing
insurance coverage as and when such policies expire or (ii) to obtain comparable
coverage from similar institutions as may be necessary or appropriate to conduct
its business as now conducted and at a cost that would not result in a Material
Adverse Change. The Company has not been denied any insurance coverage which it
has sought or for which it has applied.

        (bb) Labor Matters. To the best of Company's knowledge, no labor
disturbance by the employees of the Company exists or is imminent; and the
Company is not aware of any existing or imminent labor disturbance by the
employees of any of its principal suppliers or clinical investigators that might
be expected to result in a Material Adverse Change.

        (cc) No Price Stabilization or Manipulation. The Company has not taken
and will not take, directly or indirectly, any action designed to or that might
be reasonably expected to cause or result in stabilization or manipulation of
the price of the Common Stock to facilitate the sale or resale of the Shares.

        (dd) Lock-Up Agreements. Each officer and director of the company and
each beneficial owner of one or more percent of the outstanding issued share
capital of the Company has agreed to sign an agreement substantially in the form
attached hereto as Exhibit A (the "Lock-up Agreements"). The Company has
provided to counsel for the Underwriters a complete and accurate list of all
securityholders of the Company and the number and type of securities held by
each securityholder. The Company has provided to counsel for the Underwriters
true, accurate and complete copies of all of the Lock-up Agreements presently in
effect or effected hereby. The Company hereby represents and warrants and agrees
that during the 180 days following the date of the Prospectus (the "Lock-Up
Period"), the Company will not (i) release any of its officers, directors or
other securityholders from any lock-up agreements currently existing or
hereafter effected or (ii) consent to the removal of any transfer-restrictive
legends from any certificate representing any Common Shares, in each case
without the prior written consent of Thomas Weisel Partners.


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        (ee) Related Party Transactions. There are no business relationships or
related-party transactions involving the Company or any other person required to
be described in the Prospectus which have not been described as required.

        (ff) No Unlawful Contributions or Other Payments. Neither the Company
nor, to the best of the Company's knowledge, any employee or agent of the
Company, has made any contribution or other payment to (i) any official of, or
candidate for, any federal, state or foreign office in violation of any law or
of the character required to be disclosed in the Prospectus or (ii) any clinical
researcher in violation of any federal, state or foreign law or any rule or
policy of the Food and Drug Administration.

        (gg) Environmental Laws. (i) the Company is in compliance with all
rules, laws and regulations relating to the use, treatment, storage and disposal
of toxic substances and protection of health or the environment ("Environmental
Laws") which are applicable to its business, except where the failure to comply
would not result in a Material Adverse Change, (ii) the Company has received no
notice from any governmental authority or third party of an asserted claim under
Environmental Laws, which claim is required to be disclosed in the Registration
Statement and the Prospectus, (iii) the Company is not currently aware that it
will be required to make future material capital expenditures to comply with
Environmental Laws and (iv) no property which is owned, leased or occupied by
the Company has been designated as a Superfund site pursuant to the
Comprehensive Response, Compensation, and Liability Act of 1980, as amended (42
U.S.C. Section 9601, et seq.), or otherwise designated as a contaminated site
under applicable state or local law.

        (hh) Periodic Review of Costs of Environmental Compliance. In the
ordinary course of its business, the Company conducts a periodic review of the
effect of Environmental Laws on the business, operations and properties of the
Company, in the course of which it identifies and evaluates associated costs and
liabilities (including, without limitation, any capital or operating
expenditures required for clean-up, closure of properties or compliance with
Environmental Laws or any permit, license or approval, any related constraints
on operating activities and any potential liabilities to third parties). On the
basis of such review and the amount of its established reserves, the Company has
reasonably concluded that such associated costs and liabilities would not,
individually or in the aggregate, result in a Material Adverse Change.

        (ii) ERISA Compliance. The Company and any "employee benefit plan" (as
defined under the Employee Retirement Income Security Act of 1974, as amended,
and the regulations and published interpretations thereunder (collectively,
"ERISA")) established or maintained by the Company or its "ERISA Affiliates" (as
defined below) are in compliance in all material respects with ERISA. "ERISA
Affiliate" means, with respect to the Company, any member of any group of
organizations described in Sections 414(b),(c),(m) or (o) of the Internal
Revenue Code of 1986, as amended, and the regulations and published
interpretations thereunder (the "Code") of which the Company is a member. No
"reportable event" (as defined under ERISA) has occurred or is reasonably
expected to occur with respect to any "employee benefit plan" established or
maintained by the Company or any of its ERISA Affiliates. No "employee benefit
plan" established or maintained by the Company or any of its ERISA Affiliates,
if such "employee benefit plan" were terminated, would have any "amount of
unfunded benefit liabilities" (as defined under ERISA). Neither the Company nor
any of its ERISA Affiliates has incurred or reasonably expects to incur any
liability under (i) Title IV of ERISA with respect to termination of, or
withdrawal from, any "employee benefit plan" or (ii) Sections 412, 4971, 4975 or
4980B of the Code. Each "employee benefit plan" established or maintained by the
Company or any of its ERISA Affiliates that is intended to be qualified under
Section 401(a) of the Code is


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so qualified and nothing has occurred, whether by action or failure to act,
which would cause the loss of such qualification.

        (jj) Consents Required in Connection with the Directed Share Program. No
consent, approval, authorization or order of, or qualification with, any
governmental body or agency, other than those obtained, is required in
connection with the offering of the Directed Shares in any jurisdiction where
the Directed Shares are being offered.

        (kk) No Improper Influence in Connection with the Directed Share
Program. The Company has not offered, or caused Thomas Weisel Partners to offer,
Shares to any person pursuant to the Directed Share Program with the specific
intent to unlawfully influence (i) a customer or supplier of the Company to
alter the customer's or supplier's level or type of business with the Company or
(ii) a trade journalist or publication to write or publish favorable information
about the Company or its products.

               Any certificate signed by an officer of the Company and delivered
to the Representatives or to counsel for the Underwriters shall be deemed to be
a representation and warranty by the Company to each Underwriter as to the
matters set forth therein.


        SECTION 2. PURCHASE, SALE AND DELIVERY OF THE SHARES.

        (a) The Firm Shares. The Company agrees to issue and sell to the several
Underwriters the Firm Shares upon the terms herein set forth. On the basis of
the representations, warranties and agreements herein contained, and upon the
terms but subject to the conditions herein set forth, the Underwriters agree,
severally and not jointly, to purchase from the Company the respective number of
Firm Shares set forth opposite their names on Schedule A. The purchase price per
Firm Share to be paid by the several Underwriters to the Company shall be $[___]
per share.

        (b) The First Closing Date. Delivery of the Firm Shares to be purchased
by the Underwriters and payment therefor shall be made by the Company and the
Representatives at 6:00 a.m. San Francisco time, at the offices of Wilson
Sonsini Goodrich & Rosati, Professional Corporation, 650 Page Mill Road, Palo
Alto, California (or at such other place and time as may be agreed upon among
the Representatives and the Company), (i) on the third (3rd) full business day
following the first day that Shares are traded, or (ii) if this Agreement is
executed and delivered after 1:30 P.M., San Francisco time, the fourth (4th)
full business day following the day that this Agreement is executed and
delivered or (iii) at such other time and date not later that seven (7) full
business days following the first day that Shares are traded as the
Representatives and the Company may determine (or at such time and date to which
payment and delivery shall have been postponed pursuant to Section 8 hereof),
such time and date of payment and delivery being herein called the "Closing
Date"; provided, however, that if the Company has not made available to the
Representatives copies of the Prospectus within the time provided in Section
2(g) and 3(e) hereof, the Representatives may, in their sole discretion,
postpone the Closing Date until no later that two (2) full business days
following delivery of copies of the Prospectus to the Representatives.

        (c) The Option Shares; the Second Closing Date. In addition, on the
basis of the representations, warranties and agreements herein contained, and
upon the terms but subject to the conditions herein set forth, the Company
hereby grants an option to the several Underwriters to purchase, severally and
not jointly, up to an aggregate of 750,000 Option Shares from the Company at the
purchase price per share to be paid by the Underwriters for the Firm Shares.


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<PAGE>   11

The option granted hereunder is for use by the Underwriters solely in covering
any over-allotments in connection with the sale and distribution of the Firm
Shares. The option granted hereunder may be exercised at any time upon notice by
the Representatives to the Company, which notice may be given at any time within
30 days from the date of this Agreement. The time and date of delivery of the
Option Shares, if subsequent to the First Closing Date, is called the "Second
Closing Date" and shall be determined by the Representatives and shall not be
earlier than three nor later than five full business days after delivery of such
notice of exercise. If any Option Shares are to be purchased, each Underwriter
agrees, severally and not jointly, to purchase the number of Option Shares
(subject to such adjustments to eliminate fractional shares as the
Representatives may determine) that bears the same proportion to the total
number of Option Shares to be purchased as the number of Firm Shares set forth
on Schedule A opposite the name of such Underwriter bears to the total number of
Firm Shares. The Representatives may cancel the option at any time prior to its
expiration by giving written notice of such cancellation to the Company.

        (d) Public Offering of the Shares. The Representatives hereby advise the
Company that the Underwriters intend to offer for sale to the public, as
described in the Prospectus, their respective portions of the Shares as soon
after this Agreement has been executed and the Registration Statement has been
declared effective as the Representatives, in their sole judgment, have
determined is advisable and practicable.

        (e) Payment for the Shares. Payment for the Shares shall be made at the
First Closing Date (and, if applicable, at the Second Closing Date) by wire
transfer in immediately available-funds to the order of the Company.

               It is understood that the Representatives have been authorized,
for their own accounts and the accounts of the several Underwriters, to accept
delivery of and receipt for, and make payment of the purchase price for, the
Firm Shares and any Option Shares the Underwriters have agreed to purchase.
Thomas Weisel Partners, individually and not as a Representative of the
Underwriters, may (but shall not be obligated to) make payment for any Shares to
be purchased by any Underwriter whose funds shall not have been received by the
Representatives by the First Closing Date or the Second Closing Date, as the
case may be, for the account of such Underwriter, but any such payment shall not
relieve such Underwriter from any of its obligations under this Agreement.

        (f) Delivery of the Shares. The Company shall deliver, or cause to be
delivered, a credit representing the Firm Shares to an account or accounts at
The Depository Trust Company, as designated by the Representatives for the
accounts of the Representatives and the several Underwriters at the First
Closing Date, against the irrevocable release of a wire transfer of immediately
available funds for the amount of the purchase price therefor. The Company shall
also deliver, or cause to be delivered a credit representing the Option Shares
the Underwriters have agreed to purchase at the First Closing Date (or the
Second Closing Date, as the case may be), to an account or accounts at The
Depository Trust Company as designated by the Representatives for the accounts
of the Representatives and the several Underwriters, against the irrevocable
release of a wire transfer of immediately available funds for the amount of the
purchase price therefor. Time shall be of the essence, and delivery at the time
and place specified in this Agreement is a further condition to the obligations
of the Underwriters.

        (g) Delivery of Prospectus to the Underwriters. Not later than 12:00
noon on the second business day following the date the Shares are released by
the Underwriters for sale to the


                                       10
<PAGE>   12

public, the Company shall deliver or cause to be delivered copies of the
Prospectus in such quantities and at such places as the Representatives shall
request.


        SECTION 3. COVENANTS OF THE COMPANY.

        The Company further covenants and agrees with each Underwriter as
follows:

        (a) Registration Statement Matters. The Company will (i) use its best
efforts to cause a registration statement on Form 8-A (the "Form 8-A
Registration Statement") as required by the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), to become effective simultaneously with the
Registration Statement, (ii) use its best efforts to cause the Registration
Statement to become effective or, if the procedure in Rule 430A of the
Securities Act is followed, to prepare and timely file with the Commission under
Rule 424(b) under the Securities Act a Prospectus in a form approved by the
Representatives containing information previously omitted at the time of
effectiveness of the Registration Statement in reliance on Rule 430A of the
Securities Act and (iii) not file any amendment to the Registration Statement or
supplement to the Prospectus of which the Representatives shall not previously
have been advised and furnished with a copy or to which the Representatives
shall have reasonably objected in writing or which is not in compliance with the
Securities Act. If the Company elects to rely on Rule 462(b) under the
Securities Act, the Company shall file a Rule 462(b) Registration Statement with
the Commission in compliance with Rule 462(b) under the Securities Act prior to
the time confirmations are sent or given, as specified by Rule 462(b)(2) under
the Securities Act, and shall pay the applicable fees in accordance with Rule
111 under the Securities Act.

        (b) Securities Act Compliance. The Company will advise the
Representatives promptly (i) when the Registration Statement or any
post-effective amendment thereto shall have become effective, (ii) of receipt of
any comments from the Commission, (iii) of any request of the Commission for
amendment of the Registration Statement or for supplement to the Prospectus or
for any additional information and (iv) of the issuance by the Commission of any
stop order suspending the effectiveness of the Registration Statement or the use
of the Prospectus or of the institution of any proceedings for that purpose. The
Company will use its best efforts to prevent the issuance of any such stop order
preventing or suspending the use of the Prospectus and to obtain as soon as
possible the lifting thereof, if issued.

        (c) Blue Sky Compliance. The Company will cooperate with the
Representatives and counsel for the Underwriters in endeavoring to qualify the
Shares for sale under the securities laws of such jurisdictions (both national
and foreign) as the Representatives may reasonably have designated in writing
and will make such applications, file such documents, and furnish such
information as may be reasonably required for that purpose, provided the Company
shall not be required to qualify as a foreign corporation or to file a general
consent to service of process in any jurisdiction where it is not now so
qualified or required to file such a consent. The Company will, from time to
time, prepare and file such statements, reports and other documents, as are or
may be required to continue such qualifications in effect for so long a period
as the Representatives may reasonably request for distribution of the Shares.

        (d) Amendments and Supplements to the Prospectus and Other Securities
Act Matters. The Company will comply with the Securities Act and the Exchange
Act, and the rules and regulations of the Commission thereunder, so as to permit
the completion of the distribution of the Shares as contemplated in this
Agreement and the Prospectus. If during the period in which a prospectus is
required by law to be delivered by an Underwriter or dealer, any event shall
occur as a result of which, in the judgment of the Company or in the reasonable
opinion of


                                       11
<PAGE>   13

the Representatives or counsel for the Underwriters, it becomes necessary to
amend or supplement the Prospectus in order to make the statements therein, in
the light of the circumstances existing at the time the Prospectus is delivered
to a purchaser, not misleading, or, if it is necessary at any time to amend or
supplement the Prospectus to comply with any law, the Company promptly will
prepare and file with the Commission, and furnish at its own expense to the
Underwriters and to dealers, an appropriate amendment to the Registration
Statement or supplement to the Prospectus so that the Prospectus as so amended
or supplemented will not, in the light of the circumstances when it is so
delivered, be misleading, or so that the Prospectus will comply with the law.

        (e) Copies of the Prospectus and any Amendments and Supplements Thereto;
Electronic Prospectus. The Company agrees to furnish the Representatives,
without charge, during the period beginning on the date hereof and ending on the
later of the First Closing Date or such date, as in the opinion of counsel for
the Underwriters, the Prospectus is no longer required by law to be delivered in
connection with sales by an Underwriter or dealer (the "Prospectus Delivery
Period"), as many copies of the Prospectus and any amendments and supplements
thereto as the Representatives may request. The Company shall also cause to be
prepared and delivered to any Underwriter upon request, at the Company's
expense, within one business day from the filing of the Prospectus with the
Commission (and again within one business day after the filing of any amendment
or supplement thereto with the Commission), an "electronic Prospectus" to be
used in connection with the offering and sale of the Common Shares. As used
herein, the term "electronic Prospectus" means a form of Prospectus, and any
amendment or supplement thereto, that meets each of the following conditions:
(i) it shall be encoded in a format, satisfactory to the Representatives, that
may be transmitted electronically over the internet or via other online
distribution to offerees and purchasers of the Common Shares; and (ii) it shall
disclose the same information as the paper Prospectus (or any amendment or
supplement thereto), except to the extent that graphic and image material
contained in the paper Prospectus (or such amendment or supplement) cannot be
presented in such electronic format, in which case such graphic and image
material shall be replaced in the electronic Prospectus with a fair and accurate
narrative description or tabular representation of such material, as
appropriate. The Company hereby consents to distribution of the electronic
Prospectus (including posting of the electronic Prospectus on the internet) by
any of the Underwriters or their affiliates.

        (f) Insurance. The Company shall (i) obtain Directors and Officers
liability insurance in the minimum amount of $10 million which shall apply to
the offering contemplated hereby and (ii) cause Thomas Weisel Partners LLC to be
added to such policy such that up to $500,000 of its expenses pursuant to
Section 7(a) shall be paid directly by such insurer and (iii) shall cause Thomas
Weisel Partners LLC to be added as an additional insured to such policy in
respect of the offering contemplated hereby.

        (g) Notice of Subsequent Events. If at any time during the ninety (90)
day period after the Registration Statement becomes effective, any rumor,
publication or event relating to or affecting the Company shall occur as a
result of which in your opinion the market price of the Company Shares has been
or is likely to be materially affected (regardless of whether such rumor,
publication or event necessitates a supplement to or amendment of the
Prospectus), the Company will, after written notice from you advising the
Company to the effect set forth above, forthwith prepare, consult with you
concerning the substance of and disseminate a press release or other public
statement, reasonably satisfactory to you, responding to or commenting on such
rumor, publication or event.


                                       12
<PAGE>   14

        (h) Use of Proceeds. The Company shall apply the net proceeds from the
sale of the Shares sold by it in the manner described under the caption "Use of
Proceeds" in the Prospectus.

        (i) Transfer Agent. The Company shall engage and maintain, at its
expense, a registrar and transfer agent for the Company Shares.

        (j) Earnings Statement. As soon as practicable, the Company will make
generally available to its security holders and to the Representatives an
earnings statement (which need not be audited) covering a period of at least
twelve months beginning after the effective date of the Registration Statement
that satisfies the provisions of Section 11(a) of the Securities Act.

        (k) Periodic Reporting Obligations. During the Prospectus Delivery
Period the Company shall file, on a timely basis, with the Commission and the
Nasdaq National Market all reports and documents required to be filed under the
Exchange Act in the manner and within the time periods required by the Exchange
Act and the Nasdaq National Market.

        (l) Agreement Not to Offer or Sell Additional Securities. The Company
will not offer, sell or contract to sell, or otherwise dispose of or enter into
any transaction which is designed to, or could be expected to, result in the
disposition (whether by actual disposition or effective economic disposition due
to cash settlement or otherwise by the Company or any affiliate of the Company
or any person in privity with the Company or any affiliate of the Company)
directly or indirectly, or announce the offering of, any other Common Shares or
any securities convertible into, or exchangeable for, Common Shares; provided,
however, that the Company may (i) issue and sell Common Shares pursuant to any
director or employee stock option plan, stock ownership plan or dividend
reinvestment plan of the Company in effect at the date of the Prospectus and
described in the Prospectus so long as none of those shares may be transferred
and the Company shall enter stop transfer instructions with its transfer agent
and registrar against the transfer of any such Common Shares and (ii) the
Company may issue Common Shares issuable upon the conversion of securities or
the exercise of warrants outstanding at the date of the Prospectus and described
in the Prospectus. These restrictions terminate after the close of trading of
the Shares on the final day of the Lock-Up Period.

        (m) Future Reports to the Representatives. During the period of five
years hereafter the Company will furnish to the Representatives (i) as soon as
practicable after the end of each fiscal year, copies of the Annual Report of
the Company containing the balance sheet of the Company as of the close of such
fiscal year and statements of income, stockholders' equity and cash flows for
the year then ended and the opinion thereon of the Company's independent public
or certified public accountants; (ii) as soon as practicable after the filing
thereof, copies of each proxy statement, Annual Report on Form 10-K, Quarterly
Report on Form 10-Q, Current Report on Form 8-K or other report filed by the
Company with the Commission, the NASD or any securities exchange; and (iii) as
soon as available, copies of any report or communication of the Company mailed
generally to holders of its capital stock.

        (n) Directed Share Program. The Company (i) will indemnify Thomas Weisel
Partners for any losses incurred in connection with the Directed Share Program,
(ii) will comply with all applicable securities and other applicable laws, rules
and regulations in each jurisdiction in which the Directed Shares are offered in
connection with the Directed Share Program, and (iii) will pay all reasonable
fees and disbursements of counsel incurred by the Underwriters in connection
with the Directed Share Program and any stamp duties, similar taxes or duties or
other taxes, if any, incurred by the underwriters in connection with the
Directed Share Program.


                                       13
<PAGE>   15

        SECTION 4. CONDITIONS OF THE OBLIGATIONS OF THE UNDERWRITERS.

               The obligations of the several Underwriters to purchase and pay
for the Shares as provided herein on the First Closing Date and, with respect to
the Option Shares, the Second Closing Date, shall be subject to the accuracy of
the representations and warranties on the part of the Company set forth in
Section 1 hereof as of the date hereof and as of the First Closing Date as
though then made and, with respect to the Option Shares, as of the Second
Closing Date as though then made, to the timely performance by the Company of
its covenants and other obligations hereunder, and to each of the following
additional conditions:

        (a) Compliance with Registration Requirements; No Stop Order; No
Objection from the NASD. The Registration Statement shall have become effective
prior to the execution of this Agreement, or at such later date as shall be
consented to in writing by you; and no stop order suspending the effectiveness
thereof shall have been issued and no proceedings for that purpose shall have
been initiated or, to the knowledge of the Company or any Underwriter,
threatened by the Commission, and any request of the Commission for additional
information (to be included in the Registration Statement or the Prospectus or
otherwise) shall have been complied with to the satisfaction of Underwriters'
Counsel; and the NASD shall have raised no objection to the fairness and
reasonableness of the underwriting terms and arrangements.

        (b) Corporate Proceedings. All corporate proceedings and other legal
matters in connection with this Agreement, the form of Registration Statement
and the Prospectus, and the registration, authorization, issue, sale and
delivery of the Shares, shall have been reasonably satisfactory to Underwriters'
Counsel, and such counsel shall have been furnished with such papers and
information as they may reasonably have requested to enable them to pass upon
the matters referred to in this Section.

        (c) No Material Adverse Change. Subsequent to the execution and delivery
of this Agreement and prior to the First Closing Date, or the Second Closing
Date, as the case may be, there shall not have been any Material Adverse Change
in the condition (financial or otherwise), earnings, operations, business or
business prospects of the Company from that set forth in the Registration
Statement or Prospectus, which, in your sole judgment, is material and adverse
and that makes it, in your sole judgment, impracticable or inadvisable to
proceed with the public offering of the Shares as contemplated by the
Prospectus.

        (d) Opinion of Counsel for the Company. You shall have received on the
First Closing Date, or the Second Closing Date, as the case may be, an opinion
of Wilson Sonsini Goodrich & Rosati, Professional Corporation counsel for the
Company substantially in the form of Exhibit B attached hereto, dated the First
Closing Date, or the Second Closing Date, addressed to the Underwriters and with
reproduced copies or signed counterparts thereof for each of the Underwriters.

               Counsel rendering the opinion contained in Exhibit B may rely as
to questions of law not involving the laws of the United States or the States of
California or Delaware upon opinions of local counsel, and as to questions of
fact upon representations or certificates of officers of the Company and of
government officials, in which case their opinion is to state that they are so
relying and that they have no knowledge of any material misstatement or
inaccuracy in any such opinion, representation or certificate. Copies of any
opinion, representation or certificate so relied upon shall be delivered to you,
as Representatives of the Underwriters, and to Underwriters' Counsel.


                                       14
<PAGE>   16

        (e) Opinion of Intellectual Property Counsel . You shall have received
on the First Closing Date, or the Second Closing Date, as the case may be, an
opinion of Amster, Rothstein & Ebenstein, intellectual property counsel for
Albert Einstein College of Medicine, substantially in the form of Exhibit C
attached hereto.

        (f) Opinion of FDA Regulatory Counsel for the Company. You shall have
received on the First Closing Date, or the Second Closing Date, as the case may
be, an opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation,
FDA regulatory counsel for the Company substantially in the form of Exhibit D
attached hereto.

        (g) Opinion of Counsel for the Underwriters. You shall have received on
the First Closing Date or the Second Closing Date, as the case may be, an
opinion of O'Melveny & Myers LLP, counsel for the Underwriters, in form and
substance reasonably satisfactory to the Representatives, with respect to the
sufficiency of all corporate proceedings and other legal matters relating to
this Agreement and the transactions contemplated hereby as the Representatives
may reasonably require. The Company shall have furnished to such counsel such
documents as they may have requested for the purpose of enabling them to pass
upon such matters.

        (h) Accountants' Comfort Letter. You shall have received on the First
Closing Date and on the Second Closing Date, as the case may be, a letter from
KPMG LLP addressed to the Underwriters, dated the First Closing Date or the
Second Closing Date, as the case may be, confirming that they are independent
certified public accountants with respect to the Company within the meaning of
the Act and the applicable published Rules and Regulations and based upon the
procedures described in such letter delivered to you concurrently with the
execution of this Agreement (herein called the "Original Letter"), but carried
out to a date not more than four (4) business days prior to the First Closing
Date or the Second Closing Date, as the case may be, (i) confirming, to the
extent true, that the statements and conclusions set forth in the Original
Letter are accurate as of the First Closing Date or the Second Closing Date, as
the case may be, and (ii) setting forth any revisions and additions to the
statements and conclusions set forth in the Original Letter which are necessary
to reflect any changes in the facts described in the Original Letter since the
date of such letter, or to reflect the availability of more recent financial
statements, data or information. The letter shall not disclose any change in the
condition (financial or otherwise), earnings, operations, business or business
prospects of the Company from that set forth in the Registration Statement or
Prospectus, which, in your sole judgment, is material and adverse and that makes
it, in your sole judgment, impracticable or inadvisable to proceed with the
public offering of the Shares as contemplated by the Prospectus. The Original
Letter from KPMG LLP shall be addressed to or for the use of the Underwriters in
form and substance satisfactory to the Underwriters and shall (i) represent, to
the extent true, that they are independent certified public accountants with
respect to the Company within the meaning of the Act and the applicable
published Rules and Regulations, (ii) refer to their opinion with respect to
their examination of the balance sheet of the Company as of December 31, 1999
and related statements of operations, shareholders' equity, and cash flows for
the twelve (12) months ended December 31, 1999, (iii) state that KPMG LLP has
performed the procedures set out in Statement on Auditing Standards ("SAS") No.
71 for a review of interim financial information and providing the report of
KPMG LLP as described in SAS No. 71 on the financial statements for the
one-quarter period ended March 31, 2000 (the "Quarterly Financial Statements"),
(iv) state that in the course of such review, nothing came to their attention
that leads them to believe that any material modifications need to be made to
any of the Quarterly Financial Statements in order for them to be in compliance
with generally accepted accounting principles consistently applied across the
periods presented, (v) state that KPMG LLP has performed the


                                       15
<PAGE>   17

procedures set forth in Statement on Standards for Attestation Engagements No. 8
on the information included in the Prospectus under the caption "Management's
Discussion and Analysis of Financial Conditions and Results of Operations" and
describe or attach their report thereon (as described by SAS No. 86) and (vi)
address any other matters agreed upon by KPMG LLP and you.

        (i) Officers' Certificate. You shall have received on the First Closing
Date and the Second Closing Date, as the case may be, a certificate of the
Company, dated the First Closing Date or the Second Closing Date, as the case
may be, signed by the Chief Executive Officer and Chief Financial Officer of the
Company, to the effect that, and you shall be satisfied that:

               (i) The representations and warranties of the Company in this
        Agreement are true and correct, as if made on and as of the First
        Closing Date or the Second Closing Date, as the case may be, and the
        Company has complied with all the agreements and satisfied all the
        conditions on its part to be performed or satisfied at or prior to the
        First Closing Date or the Second Closing Date, as the case may be;

               (ii) No stop order suspending the effectiveness of the
        Registration Statement has been issued and no proceedings for that
        purpose have been instituted or are pending or threatened under the Act;

               (iii) When the Registration Statement became effective and at all
        times subsequent thereto up to the delivery of such certificate, (a) the
        Registration Statement and the Prospectus, and any amendments or
        supplements thereto, contained all material information required to be
        included therein by the Securities Act and in all material respects
        conformed to the requirements of the Securities Act, (b) the
        Registration Statement and the Prospectus, and any amendments or
        supplements thereto, did not and does not include any untrue statement
        of a material fact or omit to state a material fact required to be
        stated therein or necessary to make the statements therein not
        misleading; and (c) since the effective date of the Registration
        Statement, there has occurred no event required to be set forth in an
        amended or supplemented Prospectus which has not been so set forth; and

               (iv) Subsequent to the respective dates as of which information
        is given in the Registration Statement and Prospectus, there has not
        been (a) any material adverse change in the condition (financial or
        otherwise), earnings, operations, business or business prospects of the
        Company, (b) any transaction that is material to the Company, except
        transactions entered into in the ordinary course of business, (c) any
        obligation, direct or contingent, that is material to the Company,
        incurred by the Company, except obligations incurred in the ordinary
        course of business, (d) any change in the capital stock or outstanding
        indebtedness of the Company that is material to the Company, (e) any
        dividend or distribution of any kind declared, paid or made on the
        capital stock of the Company, or (f) any loss or damage (whether or not
        insured) to the property of the Company which has been sustained or will
        have been sustained which has a material adverse effect on the condition
        (financial or otherwise), earnings, operations, business or business
        prospects of the Company.

        (j) Lock-up Agreement from Certain Stockholders of the Company. The
Company shall have obtained and delivered to you an agreement substantially in
the form of Exhibit A attached hereto from each officer and director of the
Company and each beneficial owner of one or more percent of the outstanding
issued share capital of the Company.


                                       16
<PAGE>   18

        (k) Stock Exchange Listing. The Shares shall have been approved for
inclusion on the Nasdaq National Market, subject only to official notice of
issuance.

        (l) Compliance with Prospectus Delivery Requirements. The Company shall
have complied with the provisions of Sections 2(g) and 3(e) hereof with respect
to the furnishing of Prospectuses.

        (m) Additional Documents. On or before each of the First Closing Date
and the Second Closing Date, as the case may be, the Representatives and counsel
for the Underwriters shall have received such information, documents and
opinions as they may reasonably require for the purposes of enabling them to
pass upon the issuance and sale of the Shares as contemplated herein, or in
order to evidence the accuracy of any of the representations and warranties, or
the satisfaction of any of the conditions or agreements, herein contained.

               If any condition specified in this Section 4 is not satisfied
when and as required to be satisfied, this Agreement may be terminated by the
Representatives by notice to the Company at any time on or prior to the First
Closing Date and, with respect to the Option Shares, at any time prior to the
Second Closing Date, which termination shall be without liability on the part of
any party to any other party, except that Section 5 (Payment of Expenses),
Section 6 (Reimbursement of Underwriters' Expenses), Section 7 (Indemnification
and Contribution) and Section 10 (Representations and Indemnities to Survive
Delivery) shall at all times be effective and shall survive such termination.


        SECTION 5. PAYMENT OF EXPENSES.

               The Company agrees to pay all costs, fees and expenses incurred
in connection with the performance of its obligations hereunder and in
connection with the transactions contemplated hereby, including without
limitation (i) all expenses incident to the issuance and delivery of the Shares
(including all printing and engraving costs), (ii) all fees and expenses of the
registrar and transfer agent of the Common Shares, (iii) all necessary issue,
transfer and other stamp taxes in connection with the issuance and sale of the
Shares to the Underwriters, (iv) all fees and expenses of the Company's counsel
and independent public or certified public accountants, (v) all costs and
expenses incurred in connection with the preparation, printing, filing, shipping
and distribution of the Registration Statement (including financial statements,
exhibits, schedules, consents and certificates of experts), each preliminary
prospectus and the Prospectus, and all amendments and supplements thereto, and
this Agreement, (vi) all costs and expenses incurred by Underwriters counsel in
connection with the Directed Share Program, (vii) all filing fees, attorneys'
fees and expenses incurred by the Company or the Underwriters in connection with
qualifying or registering (or obtaining exemptions from the qualification or
registration of) all or any part of the Shares for offer and sale under the
state securities or blue sky laws or the provincial securities laws of Canada or
any other country, and, if requested by the Representatives, preparing and
printing a "Blue Sky Survey," an "International Blue Sky Survey" or other
memorandum, and any supplements thereto, advising the Underwriters of such
qualifications, registrations and exemptions, (viii) the filing fees incident
to, and the reasonable fees and expenses of counsel for the Underwriters in
connection with, the NASD review and approval of the Underwriters' participation
in the offering and distribution of the Common Shares, (ix) the fees and
expenses associated with including the Shares on the Nasdaq National Market, (x)
all costs and expenses incident to the travel and accommodation of the Company's
employees on the "roadshow," and (xi) all other fees, costs and expenses
referred to in Item 13 of Part II of the Registration Statement. Except as
provided in this Section 5, Section 6, and


                                       17
<PAGE>   19

Section 7 hereof, the Underwriters shall pay their own expenses, including the
fees and disbursements of their counsel.


        SECTION 6. REIMBURSEMENT OF UNDERWRITERS' EXPENSES.

               If this Agreement is terminated by the Representatives pursuant
to Section 4, Section 8 or Section 9, or if the sale to the Underwriters of the
Shares on the First Closing Date is not consummated because of any refusal,
inability or failure on the part of the Company to perform any agreement herein
or to comply with any provision hereof, the Company agrees to reimburse the
Representatives and the other Underwriters (or such Underwriters as have
terminated this Agreement with respect to themselves), severally, upon demand
for all out-of-pocket expenses that shall have been reasonably incurred by the
Representatives and the Underwriters in connection with the proposed purchase
and the offering and sale of the Shares, including but not limited to fees and
disbursements of counsel, printing expenses, travel and accommodation expenses,
postage, facsimile and telephone charges.


        SECTION 7. INDEMNIFICATION AND CONTRIBUTION.

        (a) Indemnification of the Underwriters. The Company agrees to indemnify
and hold harmless each Underwriter, its officers and employees, and each person,
if any, who controls any Underwriter within the meaning of the Securities Act
and the Exchange Act against any loss, claim, damage, liability or expense, as
incurred, to which such Underwriter or such controlling person may become
subject, under the Securities Act, the Exchange Act or other federal or state
statutory law or regulation, or at common law or otherwise (including in
settlement of any litigation, if such settlement is effected with the written
consent of the Company, which consent shall not be unreasonably withheld),
insofar as such loss, claim, damage, liability or expense (or actions in respect
thereof as contemplated below) arises out of or is based (i) upon any untrue
statement or alleged untrue statement of a material fact contained in the
Registration Statement, or any amendment thereto, including any information
deemed to be a part thereof pursuant to Rule 430A under the Securities Act, or
the omission or alleged omission therefrom of a material fact required to be
stated therein or necessary to make the statements therein not misleading; or
(ii) upon any untrue statement or alleged untrue statement of a material fact
contained in any preliminary prospectus or the Prospectus (or any amendment or
supplement thereto), or the omission or alleged omission therefrom of a material
fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading; or (iii) in whole or
in part upon any inaccuracy in the representations and warranties of the Company
contained herein; or (iv) in whole or in part upon any failure of the Company to
perform its obligations hereunder or under law; or (v) any untrue statement or
alleged untrue statement of any material fact contained in any audio or visual
materials provided by the Company or based upon written information furnished by
or on behalf of the Company including, without limitation, slides, videos, films
or tape recordings, used in connection with the marketing of the Shares, and
including, without limitation, statements communicated to securities analysts
employed by the Underwriters; or (vi) any act or failure to act or any alleged
act or failure to act by any Underwriter in connection with, or relating in any
manner to, the Shares or the offering contemplated hereby, and which is included
as part of or referred to in any loss, claim, damage, liability or action
arising out of or based upon any matter covered by clause (i), (ii), (iii) (iv)
or (v) above, provided that the Company shall not be liable under this clause
(vi) to the extent that a court of competent jurisdiction shall have determined
by a final judgment that such loss, claim, damage, liability or action resulted
directly from any such acts or failures to act undertaken or omitted to be taken
by such Underwriter through its bad faith or willful


                                       18
<PAGE>   20

misconduct; and to reimburse each Underwriter and each such controlling person
for any and all expenses (including the fees and disbursements of counsel chosen
by Thomas Weisel Partners) as such expenses are reasonably incurred by such
Underwriter or such controlling person in connection with investigating,
defending, settling, compromising or paying any such loss, claim, damage,
liability, expense or action; provided, however, that the foregoing indemnity
agreement shall not apply to any loss, claim, damage, liability or expense to
the extent, but only to the extent, that such loss, claim, damage, liability or
expense arises out of or is based upon any untrue statement or alleged untrue
statement or omission or alleged omission made in reliance upon and in
conformity with written information furnished to the Company by the
Representatives expressly for use in the Registration Statement, any preliminary
prospectus or the Prospectus (or any amendment or supplement thereto); and
provided, further, that with respect to any preliminary prospectus, the
foregoing indemnity agreement shall not inure to the benefit of any Underwriter
from whom the person asserting any loss, claim, damage, liability or expense
purchased Shares, or any person controlling such Underwriter, if copies of the
Prospectus were timely delivered to the Underwriter pursuant to Section 2 and a
copy of the Prospectus (as then amended or supplemented if the Company shall
have furnished any amendments or supplements thereto) was not sent or given by
or on behalf of such Underwriter to such person, if required by law so to have
been delivered, and if the Prospectus (as so amended or supplemented) would have
cured the defect giving rise to such loss, claim, damage, liability or expense.
The indemnity agreement set forth in this Section 7(a) shall be in addition to
any liabilities that the Company may otherwise have.


        (b) Indemnification of the Company, its Directors and Officers. Each
Underwriter agrees, severally and not jointly, to indemnify and hold harmless
the Company, each of its directors, each of its officers who signed the
Registration Statement and each person, if any, who controls the Company within
the meaning of the Securities Act or the Exchange Act, against any loss, claim,
damage, liability or expense, as incurred, to which the Company, or any such
director, officer or controlling person may become subject, under the Securities
Act, the Exchange Act, or other federal or state statutory law or regulation, or
at common law or otherwise (including in settlement of any litigation, if such
settlement is effected with the written consent of such Underwriter), insofar as
such loss, claim, damage, liability or expense (or actions in respect thereof as
contemplated below) arises out of or is based upon any untrue or alleged untrue
statement of a material fact contained in the Registration Statement, any
preliminary prospectus or the Prospectus (or any amendment or supplement
thereto), or arises out of or is based upon the omission or alleged omission to
state therein a material fact required to be stated therein or necessary to make
the statements therein not misleading, in each case to the extent, but only to
the extent, that such untrue statement or alleged untrue statement or omission
or alleged omission was made in the Registration Statement, any preliminary
prospectus, the Prospectus (or any amendment or supplement thereto), in reliance
upon and in conformity with written information furnished to the Company by the
Representatives expressly for use therein; and to reimburse the Company, or any
such director, officer or controlling person for any legal and other expense
reasonably incurred by the Company, or any such director, officer or controlling
person in connection with investigating, defending, settling, compromising or
paying any such loss, claim, damage, liability, expense or action. The indemnity
agreement set forth in this Section 7(b) shall be in addition to any liabilities
that each Underwriter may otherwise have.

        (c) Information Provided by the Underwriters. The Company and each
person, if any, who controls the Company within the meaning of the Securities
Act or the Exchange Act, hereby acknowledges that the only information that the
Underwriters have furnished to the Company expressly for use in the Registration
Statement, any preliminary prospectus or the


                                       19
<PAGE>   21

Prospectus (or any amendment or supplement thereto) are the statements set forth
in the table in the first paragraph and the paragraphs titled "Dealers'
Compensation" and "Discretionary Accounts" under the caption "Underwriting" in
the Prospectus; and the Underwriters confirm that such statements are correct.

        (d) Notifications and Other Indemnification Procedures. Promptly after
receipt by an indemnified party under this Section 7 of notice of the
commencement of any action, such indemnified party will, if a claim in respect
thereof is to be made against an indemnifying party under this Section 7, notify
the indemnifying party in writing of the commencement thereof, but the omission
so to notify the indemnifying party shall not relieve it from any liability
hereunder to the extent it is not materially prejudiced as a proximate result of
such failure and in any event shall not relieve it from any liability which it
may have otherwise than on account of this indemnity agreement. In case any such
action is brought against any indemnified party and such indemnified party seeks
or intends to seek indemnity from an indemnifying party, the indemnifying party
will be entitled to participate in, and, to the extent that it shall elect,
jointly with all other indemnifying parties similarly notified, by written
notice delivered to the indemnified party promptly after receiving the aforesaid
notice from such indemnified party, to assume the defense thereof with counsel
reasonably satisfactory to such indemnified party; provided, however, if the
defendants in any such action include both the indemnified party and the
indemnifying party and the indemnified party shall have reasonably concluded
that a conflict may arise between the positions of the indemnifying party and
the indemnified party in conducting the defense of any such action or that there
may be legal defenses available to it and/or other indemnified parties which are
different from or additional to those available to the indemnifying party, the
indemnified party or parties shall have the right to select separate counsel to
assume such legal defenses and to otherwise participate in the defense of such
action on behalf of such indemnified party or parties. Upon receipt of notice
from the indemnifying party to such indemnified party of such indemnifying
party's election so to assume the defense of such action and approval by the
indemnified party of counsel, the indemnifying party will not be liable to such
indemnified party under this Section 7 for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof unless (i) the indemnified party shall have employed separate counsel in
accordance with the proviso to the next preceding sentence (it being understood,
however, that the indemnifying party shall not be liable for the expenses of
more than one separate counsel (together with local counsel), approved by the
indemnifying party (Thomas Weisel Partners in the case of Section 7(b) and
Section 8), representing the indemnified parties who are parties to such
action), (ii) the indemnifying party shall not have employed counsel
satisfactory to the indemnified party to represent the indemnified party within
a reasonable time after notice of commencement of the action, or (iii) the
indemnifying party has authorized the employment of counsel for the indemnified
party at the expense of the indemnifying party, in each of which cases the fees
and expenses of counsel shall be at the expense of the indemnifying party.

        (e) Settlements. The indemnifying party under this Section 7 shall not
be liable for any settlement of any proceeding effected without its written
consent, which consent shall not be unreasonably withheld, but if settled with
such consent or if there be a final judgment for the plaintiff, the indemnifying
party agrees to indemnify the indemnified party against any loss, claim, damage,
liability or expense by reason of such settlement or judgment. Notwithstanding
the foregoing sentence, if at any time an indemnified party shall have requested
an indemnifying party to reimburse the indemnified party for fees and expenses
of counsel as contemplated by Section 7(d) hereof, the indemnifying party agrees
that it shall be liable for any settlement of any proceeding effected without
its written consent if (i) such settlement is entered into more than 60 days
after receipt by such indemnifying party of the aforesaid request and (ii) such


                                       20
<PAGE>   22

indemnifying party shall not have reimbursed the indemnified party in accordance
with such request prior to the date of such settlement. No indemnifying party
shall, without the prior written consent of the indemnified party, effect any
settlement, compromise or consent to the entry of judgment in any pending or
threatened action, suit or proceeding in respect of which any indemnified party
is or could have been a party and indemnity was or could have been sought
hereunder by such indemnified party, unless such settlement, compromise or
consent includes (i) an unconditional release of such indemnified party from all
liability on claims that are the subject matter of such action, suit or
proceeding and (ii) does not include a statement as to or an admission of fault,
culpability or a failure to act by or on behalf of any indemnified party.

        (f) Contribution. If the indemnification provided for in this Section 7
is unavailable to or insufficient to hold harmless an indemnified party under
Section 7(a) or (b) above in respect of any losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) then each
indemnifying party shall contribute to the aggregate amount paid or payable by
such indemnified party in such proportion as is appropriate to reflect the
relative benefits received by the Company on the one hand and the Underwriters
on the other from the offering of the Shares. If, however, the allocation
provided by the immediately preceding sentence is not permitted by applicable
law then each indemnifying party shall contribute to such amount paid or payable
by such indemnified party in such proportion as is appropriate to reflect not
only such relative benefits but also the relative fault of the Company on the
one hand and the Underwriters on the other in connection with the statements or
omissions which resulted in such losses, claims, damages or liabilities, (or
actions or proceedings in respect thereof), as well as any other relevant
equitable considerations. The relative benefits received by the Company on the
one hand, and the Underwriters on the other shall be deemed to be in the same
proportion as the total net proceeds (before deducting expenses) received by the
Company from the sale of the Shares sold by it in the offering bears to the
total underwriting discounts and commissions received by the Underwriters in
connection with the sale of such Shares, in each case as described in the
Prospectus. The relative fault shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information
supplied by the Company on the one hand or the Underwriters on the other and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such statement or omission.

               The Company and the Underwriters agree that it would not be just
and equitable if contributions pursuant to this Section 7(f) were determined by
pro rata allocation (even if the Underwriters were treated as one entity for
such purpose) or by any other method of allocation which does not take account
of the equitable considerations referred to above in this Section 7(f). The
amount paid or payable by an indemnified party as a result of the losses,
claims, damages or liabilities (or actions or proceedings in respect thereof)
referred to above in this Section 7(f) shall be deemed to include any legal or
other expenses reasonably incurred by such indemnified party in connection with
investigating or defending any such action or claim. Notwithstanding the
provisions of this subsection (f), (i) no Underwriter shall be required to
contribute any amount in excess of the underwriting discounts and commissions
applicable to the Shares purchased by such Underwriter and (ii) no person guilty
of fraudulent misrepresentation (within the meaning of Section 11(f) of the
Securities Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation. The Underwriters' obligations in
this Section 7(f) to contribute are several in proportion to their respective
underwriting obligations and not joint.

        (g) Timing of Any Payments of Indemnification. Any losses, claims,
damages, liabilities or expenses for which an indemnified party is entitled to
indemnification or


                                       21
<PAGE>   23

contribution under this Section 7 shall be paid by the indemnifying party to the
indemnified party as such losses, claims, damages, liabilities or expenses are
incurred, but in all cases, no later than forty-five (45) days of invoice to the
indemnifying party.

        (h) Survival. The indemnity and contribution agreements contained in
this Section 7 and the representation and warranties set forth in this Agreement
shall remain operative and in full force and effect, regardless of (i) any
investigation made by or on behalf of any Underwriter or any person controlling
any Underwriter, the Company, its directors or officers or any persons
controlling the Company, (ii) acceptance of any Shares and payment therefor
hereunder, and (iii) any termination of this Agreement. A successor to any
Underwriter, or to the Company, its directors or officers or any person
controlling the Company, shall be entitled to the benefits of the indemnity,
contribution and reimbursement agreements contained in this Section 7.

        (i) Acknowledgements of Parties. The parties to this Agreement hereby
acknowledge that they are sophisticated business persons who were represented by
counsel during the negotiations regarding the provisions hereof including,
without limitation, the provisions of this Section 7, and are fully informed
regarding said provisions. They further acknowledge that the provisions of this
Section 7 fairly allocate the risks in light of the ability of the parties to
investigate the Company and its business in order to assure that adequate
disclosure is made in the Registration Statement and Prospectus as required by
the Securities Act and the Exchange Act.

        (j) Indemnification for Directed Share Program. The Company agrees to
indemnify and hold harmless Thomas Weisel Partners and its affiliates and each
person, if any, who controls Thomas Weisel Partners or its affiliates within the
meaning of either Section 15 of the Securities Act or Section 20 of the Exchange
Act ("Thomas Weisel Partners Entities"), from and against any and all losses,
claims, damages and liabilities (including, without limitation, any legal or
other expenses reasonably incurred in connection with defending or investigating
any such action or claim) (i) caused by any untrue statement or alleged untrue
statement of a material fact contained in any material prepared by or with the
consent of the Company for distribution to participants in connection with the
Directed Share Program, or caused by any omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the
statements therein not misleading; (ii) the failure of any participant to pay
for and accept delivery of Directed Shares that the participant has agreed to
purchase; or (iii) related to, arising out of, or in connection with the
Directed Share Program other than losses, claims, damages or liabilities (or
expenses relating thereto) that are finally judicially determined to have
resulted from the bad faith or willful misconduct of Thomas Weisel Partners
Entities.


        SECTION 8. DEFAULT OF ONE OR MORE OF THE SEVERAL UNDERWRITERS.

               If, on the First Closing Date or the Second Closing Date, as the
case may be, any one or more of the several Underwriters shall fail or refuse to
purchase Shares that it or they have agreed to purchase hereunder on such date,
and the aggregate number of Common Shares which such defaulting Underwriter or
Underwriters agreed but failed or refused to purchase does not exceed 10% of the
aggregate number of the Shares to be purchased on such date, the other
Underwriters shall be obligated, severally, in the proportions that the number
of Firm Common Shares set forth opposite their respective names on Schedule A
bears to the aggregate number of Firm Shares set forth opposite the names of all
such non-defaulting Underwriters, or in such other proportions as may be
specified by the Representatives with the consent of the non-defaulting
Underwriters, to purchase the Shares which such defaulting Underwriter or
Underwriters agreed but failed or refused to purchase on such date. If, on the
First Closing Date


                                       22
<PAGE>   24

or the Second Closing Date, as the case may be, any one or more of the
Underwriters shall fail or refuse to purchase Shares and the aggregate number of
Shares with respect to which such default occurs exceeds 10% of the aggregate
number of Shares to be purchased on such date, and arrangements satisfactory to
the Representatives and the Company for the purchase of such Shares are not made
within 48 hours after such default, this Agreement shall terminate without
liability of any party to any other party except that the provisions of Section
5, and Section 7 shall at all times be effective and shall survive such
termination. In any such case either the Representatives or the Company shall
have the right to postpone the First Closing Date or the Second Closing Date, as
the case may be, but in no event for longer than seven days in order that the
required changes, if any, to the Registration Statement and the Prospectus or
any other documents or arrangements may be effected.

               As used in this Agreement, the term "Underwriter" shall be deemed
to include any person substituted for a defaulting Underwriter under this
Section 8. Any action taken under this Section 8 shall not relieve any
defaulting Underwriter from liability in respect of any default of such
Underwriter under this Agreement.


        SECTION 9. TERMINATION OF THIS AGREEMENT.

               This Agreement may be terminated by the Representatives by notice
given to the Company if (a) at any time after the execution and delivery of this
Agreement and prior to the First Closing Date (i) trading or quotation in any of
the Company's securities shall have been suspended or limited by the Commission
or by the Nasdaq Stock Market, or trading in securities generally on either the
Nasdaq Stock Market or the New York Stock Exchange shall have been suspended or
limited, or minimum or maximum prices shall have been generally established on
any of such stock exchanges by the Commission or the NASD; (ii) a general
banking moratorium shall have been declared by any of federal, New York,
Delaware or California authorities; (iii) there shall have occurred any outbreak
or escalation of national or international hostilities or any crisis or
calamity, or any change in the United States or international financial markets,
or any substantial change or development involving a prospective change in
United States' or international political, financial or economic conditions, as
in the judgment of the Representatives is material and adverse and makes it
impracticable or inadvisable to market the Common Shares in the manner and on
the terms contemplated in the Prospectus or to enforce contracts for the sale of
securities; (iv) in the judgment of the Representatives there shall have
occurred any Material Adverse Change; or (v) the Company shall have sustained a
loss by strike, fire, flood, earthquake, accident or other calamity of such
character as in the judgment of the Representatives may interfere materially
with the conduct of the business and operations of the Company regardless of
whether or not such loss shall have been insured; or (b) in the case of any of
the events specified 9(a)(i)-(v), such event singly or together with any other
event, makes it, in your judgment, impracticable or inadvisable to market the
Common Shares in the manner and on the terms contemplated in the Prospectus. Any
termination pursuant to this Section 9 shall be without liability on the part of
(x) the Company to any Underwriter, except that the Company shall be obligated
to reimburse the expenses of the Representatives and the Underwriters pursuant
to Sections 5 and 6 hereof, (y) any Underwriter to the Company or any person
controlling the Company, or (z) of any party hereto to any other party except
that the provisions of Section 7 shall at all times be effective and shall
survive such termination.


                                       23
<PAGE>   25

        SECTION 10. REPRESENTATIONS AND INDEMNITIES TO SURVIVE DELIVERY.

               The respective indemnities, agreements, representations,
warranties and other statements of the Company or any person controlling the
company, of its officers and of the several Underwriters set forth in or made
pursuant to this Agreement will remain in full force and effect, regardless of
any investigation made by or on behalf of any Underwriter or the Company or any
of its or their partners, officers or directors or any controlling person, as
the case may be, and will survive delivery of and payment for the Shares sold
hereunder and any termination of this Agreement.


        SECTION 11. NOTICES.

               All communications hereunder shall be in writing and shall be
mailed, hand delivered or telecopied and confirmed to the parties hereto as
follows:

If to the Representatives:

        Thomas Weisel Partners LLC
        One Montgomery Street, Suite 3700
        San Francisco, California  94104
        Attention:  General Counsel

with a copy to:

        O'Melveny & Myers LLP
        Embarcadero Center West
        275 Battery Street, Suite 2600
        San Francisco, CA  94111-3305
        Facsimile:  (415) 984-8701
        Attention:  Peter T. Healy, Esq.

If to the Company:

        Pain Therapeutics, Inc.
        250 East Grand Avenue, Suite 70
        South San Francisco, CA  94080
        Facsimile:  (650) 624-8222
        Attention:  Remi Barbier

with a copy to:

        Wilson Sonsini Goodrich & Rosati, Professional Corporation
        650 Page Mill Road
        Palo Alto, California  94304
        Facsimile:  (650) 493-6811
        Attention:  Martin Waters, III

Any party hereto may change the address for receipt of communications by giving
written notice to the others.


                                       24
<PAGE>   26

        SECTION 12. SUCCESSORS.

               This Agreement will inure to the benefit of and be binding upon
the parties hereto, including any substitute Underwriters pursuant to Section 9
hereof, and to the benefit of the employees, officers and directors and
controlling persons referred to in Section 7, and to their respective
successors, and personal representatives, and no other person will have any
right or obligation hereunder. The term "successors" shall not include any
purchaser of the Shares as such from any of the Underwriters merely by reason of
such purchase.


        SECTION 13. PARTIAL UNENFORCEABILITY.

               The invalidity or unenforceability of any Section, paragraph or
provision of this Agreement shall not affect the validity or enforceability of
any other Section, paragraph or provision hereof. If any Section, paragraph or
provision of this Agreement is for any reason determined to be invalid or
unenforceable, there shall be deemed to be made such minor changes (and only
such minor changes) as are necessary to make it valid and enforceable.


        SECTION 14. SECTION 14. GOVERNING LAW PROVISIONS.

        (a) Governing Law. This agreement shall be governed by and construed in
accordance with the internal laws of the state of New York applicable to
agreements made and to be performed in such state.

        (b) Consent to Jurisdiction. Any legal suit, action or proceeding
arising out of or based upon this Agreement or the transactions contemplated
hereby ("Related Proceedings") may be instituted in the federal courts of the
United States of America located in the City and County of San Francisco or the
courts of the State of California in each case located in the City and County of
San Francisco (collectively, the "Specified Courts"), and each party irrevocably
submits to the exclusive jurisdiction (except for proceedings instituted in
regard to the enforcement of a judgment of any such court (a "Related
Judgment"), as to which such jurisdiction is non-exclusive) of such courts in
any such suit, action or proceeding. Service of any process, summons, notice or
document by mail to such party's address set forth above shall be effective
service of process for any suit, action or other proceeding brought in any such
court. The parties irrevocably and unconditionally waive any objection to the
laying of venue of any suit, action or other proceeding in the Specified Courts
and irrevocably and unconditionally waive and agree not to plead or claim in any
such court that any such suit, action or other proceeding brought in any such
court has been brought in an inconvenient forum.


        SECTION 15. GENERAL PROVISIONS.

               This Agreement constitutes the entire agreement of the parties to
this Agreement and supersedes all prior written or oral and all contemporaneous
oral agreements, understandings and negotiations with respect to the subject
matter hereof. This Agreement may be executed in two or more counterparts, each
one of which shall be an original, with the same effect as if the signatures
thereto and hereto were upon the same instrument. This Agreement may not be
amended or modified unless in writing by all of the parties hereto, and no
condition herein (express or implied) may be waived unless waived in writing by
each party whom the condition is meant to benefit. Section headings herein are
for the convenience of the parties only and shall not affect the construction or
interpretation of this Agreement.



                                       25
<PAGE>   27


         [The remainder of this page has been intentionally left blank.]








                                       26
<PAGE>   28

               If the foregoing is in accordance with your understanding of our
agreement, please sign and return to the Company the enclosed copies hereof,
whereupon this instrument, along with all counterparts hereof, shall become a
binding agreement in accordance with its terms.


                                       Very truly yours,

                                       PAIN THERAPEUTICS, INC.



                                       By:______________________________________
                                              Remi Barbier
                                              President



The foregoing Underwriting Agreement is hereby confirmed and accepted by the
Representatives as of the date first above written.

THOMAS WEISEL PARTNERS LLC
CIBC WORLD MARKETS CORP.
TUCKER ANTHONY INCORPORATED

On their behalf and on behalf of each of the several underwriters named in
Schedule A hereto.

BY:  THOMAS WEISEL PARTNERS LLC



By:_________________________________
        Authorized Signatory


                                      S-1
<PAGE>   29

                                   SCHEDULE A

                                  UNDERWRITERS


<TABLE>
<CAPTION>
                                                                            Number of
                                                                           Firm Shares
                                                                              To be
                            Underwriters                                    Purchased
-----------------------------------------------------------------------    ------------
<S>                                                                        <C>
Thomas Weisel Partners LLC ............................................        [___]
CIBC World Markets Corp................................................        [___]
Tucker Anthony Incorporated............................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
[___] .................................................................        [___]
-----------------------------------------------------------------------    ------------

        Total..........................................................        [___]
                                                                           ============
</TABLE>



                                   Schedule A
<PAGE>   30

                                    EXHIBIT A

                                LOCK-UP AGREEMENT


Thomas Weisel Partners LLC
CIBC World Markets Corp.
Tucker Anthony Incorporated
        As Representatives of the Several Underwriters
c/o Thomas Weisel Partners LLC
One Montgomery Street, Suite 3700
San Francisco, California  94104

               Re:  Pain Therapeutics, Inc. (the "Company")

Ladies & Gentlemen:

               The undersigned is an owner of record or beneficially of certain
shares of Common Stock of the Company ("Common Stock") or securities convertible
into or exchangeable or exercisable for Common Stock. The Company proposes to
carry out a public offering of Common Stock (the "Offering") for which you will
act as the representatives (the "Representatives") of the underwriters. The
undersigned recognizes that the Offering will be of benefit to the undersigned
and will benefit the Company by, among other things, raising additional capital
for its operations. The undersigned acknowledges that you and the other
underwriters are relying on the representations and agreements of the
undersigned contained in this letter in carrying out the Offering and in
entering into underwriting arrangements with the Company with respect to the
Offering.

               In consideration of the foregoing, the undersigned hereby agrees
that the undersigned will not offer to sell, contract to sell, or otherwise
sell, dispose of, loan, pledge or grant any rights with respect to
(collectively, a "Disposition") any shares of Common Stock, any options or
warrants to purchase any shares of Common Stock or any securities convertible
into or exchangeable for shares of Common Stock (collectively, "Securities") now
owned or hereafter acquired directly by such person or with respect to which
such person has or hereafter acquires the power of disposition, otherwise than
(i) as a bona fide gift or gifts, provided the donee or donees thereof agree in
writing to be bound by this restriction, (ii) as a distribution to partners or
shareholders of such person, provided that the distributees thereof agree in
writing to be bound by the terms of this restriction, (iii) with respect to
sales or purchases of Common Stock acquired on the open market or (iv) with the
prior written consent of Thomas Weisel Partners LLC. The foregoing restrictions
will terminate after the close of trading of the Common Stock on the 180th day
of (and including) the day the Common Stock commenced trading on the Nasdaq
National Market (the "Lock-Up" Period). The foregoing restriction has been
expressly agreed to preclude the holder of the Securities from engaging in any
hedging or other transaction which is designed to or reasonably expected to lead
to or result in a Disposition of Securities during the Lock-up Period, even if
such Securities would be disposed of by someone other than such holder. Such
prohibited hedging or other transactions would include, without limitation, any
short sale (whether or not against the box) or any purchase, sale or grant of
any right (including, without limitation, any put or call option) with respect
to any Securities or with respect to any security (other than a broad-based
market basket or index) that included, relates to or derives any significant
part of its value from Securities. The undersigned also agrees and consents to
the entry of stop transfer instructions with the Company's transfer agent and
registrar against the


                                       A-1
<PAGE>   31

transfer of shares of Common Stock or Securities held by the undersigned except
in compliance with the foregoing restrictions.

               With respect to the Offering only, the undersigned waives any
registration rights relating to registration under the Securities Act of 1933,
as amended, of any Common Stock owned either of record or beneficially by the
undersigned, including any rights to receive notice of the Offering.

               This agreement is irrevocable and will be binding on the
undersigned and the respective successors, heirs, personal representatives, and
assigns of the undersigned. In the event the Offering has not occurred on or
before December 31, 2000, this Lock-Up Agreement shall be of no further force or
effect.


                                      Dated:____________________________________


                                      __________________________________________
                                                         Printed Name of Holder


                                      By:_______________________________________
                                                                      Signature


                                      __________________________________________
                                                 Printed Name of Person Signing
                                     (and indicate capacity of person signing if
                                            signing as custodian, trustee, or on
                                                            behalf of an entity)



                                      A-2
<PAGE>   32

                                    EXHIBIT B

             MATTERS TO BE COVERED IN THE OPINION OF COMPANY COUNSEL


               (i) The Company has been duly incorporated and is validly
        existing as a corporation in good standing under the laws of the
        jurisdiction of its incorporation;

               (ii) The Company has the corporate power and authority to own,
        lease and operate its properties and to conduct its business as
        described in the Prospectus;

               (iii) The Company is duly qualified to do business as a foreign
        corporation and is in good standing in each jurisdiction, if any, in
        which the ownership or leasing of its properties or the conduct of its
        business requires such qualification, except where the failure to be so
        qualified or be in good standing would not have a Material Adverse
        Effect. To such counsel's knowledge, the Company does not own or
        control, directly or indirectly, any corporation, association or other
        entity.

               (iv) The authorized, issued and outstanding capital stock of the
        Company is as set forth in the Prospectus under the caption
        "Capitalization" as of the dates stated therein, the issued and
        outstanding shares of capital stock of the Company outstanding prior to
        the issuance of the Shares have been duly and validly issued and are
        fully paid and nonassessable, and will not have been issued in violation
        of or subject to any preemptive right arising under the certificate of
        incorporation or Delaware General Corporation Law, or, to such counsel's
        knowledge, any co-sale right, right of first refusal or other similar
        right, other than any registration rights described in Opinion (xix)
        hereof;

               (v) The Firm Shares or the Option Shares, as the case may be, to
        be issued by the Company pursuant to the terms of the Underwriting
        Agreement have been duly authorized and, upon issuance and delivery
        against payment therefor in accordance with the terms hereof, will be
        duly and validly issued and fully paid and nonassessable, and will not
        have been issued in violation of or subject to any preemptive right
        arising under the certificate of incorporation or Delaware General
        Corporation Law, or, any co-sale right, right of first refusal or other
        similar right, other than any registration rights described in Opinion
        (xix) hereof.

               (vi) The Company has the corporate power and authority to enter
        into this Agreement and to issue, sell and deliver to the Underwriters
        the Shares to be issued and sold by it hereunder;

               (vii) This Agreement has been duly authorized by all necessary
        corporate action on the part of the Company and has been duly executed
        and delivered by the Company and, assuming due authorization, execution
        and delivery by you, [and assuming that the laws of the State of New
        York are identical to the laws of the State of California] is a valid
        and binding agreement of the Company, enforceable in accordance with its
        terms, except as rights to indemnification hereunder may be limited by
        applicable law and except as enforceability may be limited by
        bankruptcy, insolvency, reorganization, moratorium or similar laws
        relating to or affecting creditors' rights generally or by general
        equitable principles (whether relief is sought in a proceeding at law or
        in equity);


                                       B-1
<PAGE>   33

               (viii) The Registration Statement has become effective under the
        Securities Act and the Shares have been validly registered under the
        Securities Act and the applicable rules and regulations of the
        Commission thereunder and, to such counsel's knowledge, no stop order
        suspending the effectiveness of the Registration Statement has been
        issued and no proceedings for that purpose have been instituted or are
        pending or threatened under the Securities Act;

               (ix) The 8-A Registration Statement complied as to form in all
        material respects with the requirements of the Exchange Act; the 8-A
        Registration Statement has become effective under the Exchange Act; and
        the Common Shares have been validly registered under the Exchange Act
        and the applicable rules and regulations of the Commission thereunder,
        and, to such counsel's knowledge, no stop order suspending the
        effectiveness of the Form 8-A Registration Statement has been issued and
        no proceedings for that purpose have been instituted or are pending or
        threatened under the Exchange Act;

               (x) The Registration Statement and the Prospectus, and each
        amendment or supplement thereto (other than the financial statements
        (including supporting schedules) and financial data derived therefrom as
        to which such counsel need express no opinion), as of the effective date
        of the Registration Statement, complied as to form in all material
        respects with the requirements of the Securities Act and the applicable
        Rules and Regulations;

               (xi) The information in the Prospectus under the captions "Risk
        Factors--The provisions of our charter documents may inhibit potential
        acquisition bids that a stockholder may believe are desirable, and the
        market price of our common stock may be lower as a result," "Risk
        Factors--Delaware law may inhibit potential acquisition bids; this may
        adversely affect the market price of our common stock, discourage merger
        offers and prevent changes in our management," "Management--Limitations
        on Directors' and Officers' Liability and Indemnification,"
        "Management--Stock Plans," "Description of Capital Stock" and "Shares
        Eligible for Future Sale," to the extent that it constitutes matters of
        law or legal conclusions, has been reviewed by such counsel and is an
        accurate and fair summary of such matters and conclusions;

               (xii) The forms of certificates evidencing the Common Stock and
        filed as exhibits to the Registration Statement comply with Delaware
        law;

               (xiii) The description in the Registration Statement and the
        Prospectus of the charter and bylaws of the Company and of statutes are
        accurate and fairly present the information required to be presented by
        the Securities Act;

               (xiv) To such counsel's knowledge, there are no agreements,
        contracts, leases or documents to which the Company is a party of a
        character required to be described or referred to in the Registration
        Statement or Prospectus or to be filed as an exhibit to the Registration
        Statement which are not described or referred to therein or filed as
        required;

               (xv) The performance of this Agreement and the consummation of
        the transactions herein contemplated (other than performance of the
        Company's indemnification obligations hereunder, concerning which no
        opinion need be expressed) will not (a) result in any violation of the
        Company's charter or bylaws or (b) to such counsel's knowledge, result
        in a material breach or violation of any of the terms and provisions of,
        or constitute a default under, any bond, debenture, note or other
        evidence of


                                       B-2
<PAGE>   34

        indebtedness, or any lease, contract, indenture, mortgage, deed of
        trust, loan agreement, joint venture or other agreement or instrument
        known to such counsel to which the Company is a party or by which its
        properties are bound, or any applicable statute, rule or regulation
        known to such counsel or, to such counsel's knowledge, any order, writ
        or decree of any court, government or governmental agency or body having
        jurisdiction over the Company or over any of its properties or
        operations;

               (xvi) No consent, approval, authorization or order of or
        qualification with any court, government or governmental agency or body
        having jurisdiction over the Company or over any of its properties or
        operations is necessary in connection with the consummation by the
        Company of the transactions herein contemplated, except (i) such as have
        been obtained under the Securities Act, (ii) such as may be required
        under state or other securities or Blue Sky laws in connection with the
        purchase and the distribution of the Shares by the Underwriters, (iii)
        such as may be required by the NASD and (iv) such as may be required
        under the federal or provincial laws of Canada;

               (xvii) To such counsel's knowledge, there are no legal or
        governmental proceedings pending or threatened against the Company of a
        character required to be disclosed in the Registration Statement or the
        Prospectus by the Securities Act, other than those described therein;

               (xviii)To such counsel's knowledge, the Company is not presently
        (a) in material violation of its charter or bylaws, or (b) in material
        breach of any applicable statute, rule or regulation known to such
        counsel or, to such counsel's knowledge, any order, writ or decree of
        any court or governmental agency or body having jurisdiction over the
        Company or over any of its properties or operations; and

               (xix) To such counsel's knowledge, except as set forth in the
        Registration Statement and Prospectus, no holders of Common Shares or
        other securities of the Company have registration rights with respect to
        securities of the Company and, except as set forth in the Registration
        Statement and Prospectus, all holders of securities of the Company
        having rights known to such counsel to registration of Common Shares or
        other securities, because of the filing of the Registration Statement by
        the Company, have, with respect to the offering contemplated thereby,
        waived such rights or such rights have expired by reason of lapse of
        time following notification of the Company's intent to file the
        Registration Statement or have included securities in the Registration
        Statement pursuant to the exercise of and in full satisfaction of such
        rights.

               (xx) The Company is not and, after giving effect to the offering
        and the sale of the Shares and the application of the proceeds thereof
        as described in the Prospectus, will not be, an "investment company" as
        such term is defined in the Investment Company Act of 1940, as amended.

               (xxi) The License Agreement, dated May 5, 1998 by and between the
        Company and Albert Einstein College of Medicine has been duly authorized
        by all necessary corporate action on the part of the Company and has
        been duly executed and delivered by the Company and, assuming due
        authorization, execution and delivery by Albert Einstein College of
        Medicine, is a valid and binding agreement of Albert Einstein College of
        Medicine, enforceable in accordance with its terms.


                                       30
<PAGE>   35

        In addition, such counsel shall state that such counsel has participated
in conferences with officials and other representatives of the Company, the
Representatives, Underwriters' Counsel and the independent certified public
accountants of the Company, at which such conferences the contents of the
Registration Statement and Prospectus and related matters were discussed, and
although they have not verified the accuracy or completeness of the statements
contained in the Registration Statement or the Prospectus, nothing has come to
the attention of such counsel which leads them to believe that, at the time the
Registration Statement became effective and at all times subsequent thereto up
to and on the First Closing Date or Second Closing Date, as the case may be, the
Registration Statement and any amendment or supplement thereto (other than the
financial statements including supporting schedules and other financial and
statistical information derived therefrom, as to which such counsel need express
no comment) contained any untrue statement of a material fact or omitted to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading, or at the First Closing Date or the Second
Closing Date, as the case may be, the Registration Statement, the Prospectus and
any amendment or supplement thereto (except as aforesaid) contained any untrue
statement of a material fact or omitted to state a material fact necessary to
make the statements therein, in the light of the circumstances under which they
were made, not misleading.



                                      B-4
<PAGE>   36

                                    EXHIBIT C

                     MATTERS TO BE COVERED IN THE OPINION OF
                  INTELLECTUAL PROPERTY COUNSEL FOR THE COMPANY


               Such counsel shall state that they are familiar with the
technology used by the Company in its business and the manner of its use thereof
and have read the Registration Statement and the Prospectus, including
particularly the portions of the Registration Statement and the Prospectus
referring to patents, trade secrets, trademarks, service marks or other
proprietary information or materials and:

               (i) The information in the Prospectus under the captions "Risk
        Factors--If we are unable to protect our intellectual property our
        competitors could develop and market products with similar features that
        may reduce demand for our products," and the final three paragraphs of
        "Business--Technology Overview," and in the final sentence of the first
        paragraph under the caption "Business--Products in Development--PTI-601:
        tramadol" (regarding the expiration of certain patents) to the extent
        that it constitutes matters of law or legal conclusions, has been
        reviewed by such counsel and is an accurate and fair summary of such
        matters and conclusions;

               (ii) Such counsel knows of no material action, suit, claim or
        proceeding relating to patents, patent rights or licenses, trademarks or
        trademark rights, copyrights, collaborative research, licenses or
        royalty arrangements or agreements or trade secrets, know-how or
        proprietary techniques, including processes and substances, owned by,
        licensed by or affecting the business or operations of the Company which
        are pending or threatened against the Company or Albert Einstein College
        of Medicine ("AECOM") or any of their respective officers or directors;

               (iii) AECOM is listed in the records of the United States Patent
        and Trademark Office as the holder of record of the patents listed on a
        schedule to such opinion (the "Patents") and each of the applications
        listed on a schedule to such opinion (the "Applications"). AECOM has
        granted the Company an exclusive worldwide license to each of the
        Patents and Applications listed in such schedule. To the knowledge of
        such counsel, there are no claims of third parties to any ownership
        interest, license or lien with respect to any of the Patents or
        Applications, other than the U.S. Government to the extent indicated on
        such schedule. Such counsel is not aware of any material defect in form
        in the preparation or filing of the Applications. To the knowledge of
        such counsel, the Applications are being pursued by the Company or
        Albert Einstein College of Medicine (as applicable). To the knowledge of
        such counsel, except as indicated on such schedule, Albert Einstein
        College of Medicine (apart from the license to the Company) owns as its
        sole property the Patents and pending Applications;

               (iv) The license agreement between AECOM and Alan E. Kligerman,
        dated October 1, 1994, as amended, has been validly and effectively
        terminated and neither Alan E. Kligerman nor his successors or assigns
        retains any residual interest in any of the Patents or Applications. The
        license agreement between AECOM and the _____________________ dated
        August 30, 1996, as amended, has been validly and effectively terminated
        and neither the ___________________________ nor its successors or
        assigns retains any residual interest in any of the Patents or
        Applications.


                                       C-1
<PAGE>   37

               (v) The Company or Albert Einstein College of Medicine, as
        applicable, is listed in the records of the appropriate foreign offices
        as the sole holder of record of the foreign patents listed on a schedule
        to such opinion (the "Foreign Patents") and each of the applications
        listed on a schedule to such opinion (the "Foreign Applications").
        Albert Einstein College of Medicine has granted the Company an exclusive
        worldwide license to each of the Foreign Patents and Foreign
        Applications listed in such schedule that are shown as being owned by
        Albert Einstein College of Medicine. Such counsel knows of no claims of
        third parties to any ownership interest or lien with respect to the
        Foreign Patents or Foreign Applications. Such counsel is not aware of
        any material defect of form in the preparation or filing of the Foreign
        Applications. To the knowledge of such counsel, the Foreign Applications
        are being pursued by the Company or Albert Einstein College of Medicine
        (as applicable). To the knowledge of such counsel, the Company or Albert
        Einstein College of Medicine (apart from the license to the Company), as
        applicable, owns as its sole property the Foreign Patents and pending
        Foreign Applications; and

               (vi) Such counsel knows of no reason why the Patents or Foreign
        Patents are not valid as issued. Such counsel has no knowledge of any
        reason why any patent to be issued as a result of any Application or
        Foreign Application would not be valid or would not afford the Company
        or Albert Einstein College of Medicine, as applicable, useful patent
        protection with respect thereto.

        In addition, such counsel shall state that they have reviewed the
Registration Statement and Prospectus and, although such counsel is not passing
upon and does not assume any responsibility for the accuracy, completeness or
fairness of any statements contained in the Registration Statement or the
Prospectus (other than as specified above), and any supplements or amendments
thereto, on the basis of the foregoing, nothing has come to their attention
which would lead them to believe that either the Registration Statement or any
amendments thereto, at the time the Registration Statement or such amendments
became effective, contained an untrue statement of a material fact or omitted to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading or that the Prospectus, as of its date or at
the date of such opinion letter, contained an untrue statement of a material
fact or omitted to state a material fact regarding the Company's Intellectual
Property necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading (it being understood
that such counsel need express no belief as to the financial statements or
schedules or other financial or statistical data derived therefrom, included or
incorporated by reference in the Registration Statement or the Prospectus or any
amendments or supplements thereto).


                                      C-2
<PAGE>   38

                                    EXHIBIT D

                     MATTERS TO BE COVERED IN THE OPINION OF
                     FDA REGULATORY COUNSEL FOR THE COMPANY


               Such counsel shall state that they act as the Company's Food and
Drug Administration ("FDA") counsel and in such capacity are familiar with the
Company's submissions to and relations with the FDA. Such counsel shall further
state that they have read the Registration Statement and the Prospectus,
including particularly those portions of the Registration Statement and the
Prospectus describing (a) the Company's FDA applications and the status thereof
and (b) the Federal Food, Drug, and Cosmetic Act ("FDC Act"), the Public Health
Service Act ("PHS Act") or the FDA regulations (such matters (a) and (b)
collectively, the "FDA Regulatory Matters") and in their opinion:

               (i) The information in the Prospectus under the captions "Risk
        Factors--If we are unable to design, conduct and complete clinical
        trials successfully, we will not be able to obtain FDA approval of our
        product candidates," "--If we fail to obtain the necessary regulatory
        approvals, we will not be allowed to commercialize our drugs and we will
        not generate product revenues," and "Business--Government Regulation,"
        insofar as such statements constitute legal conclusions under the FDC
        Act, the PHS Act or FDA regulations or summaries of FDA Regulatory
        Matters, has been reviewed by such counsel and is an accurate and fair
        summary of such matters and conclusions.

               (ii) Such counsel knows of no material action, suit, claim or
        proceeding relating to FDA Regulatory Matters which is pending or
        threatened against the Company or any of its officers or directors, nor
        is such counsel aware of any material violations of the FDC Act, the PHS
        Act or FDA regulations by the Company or any of its officers or
        directors.

               (iii) The Company has filed the Investigational New Drug ("IND")
        applications the FDA listed on Schedule 1 to such letter (collectively,
        the "US Applications"). The FDA has not denied any of the Company's US
        Applications, [other than as noted on Schedule 1]. [Apart from such
        denied US Applications,] such counsel is not aware of any material
        defect in form in the preparation or filing of the US Applications,
        other than as noted in Schedule 1. To the knowledge of such counsel,
        [apart from such denied US Applications,] the US Applications are being
        diligently pursued by the Company, [other than as noted in Schedule 1].
        To the knowledge of such counsel, the Company is the sole owner of the
        US Applications, [other than as noted in Schedule 1].

               (iv) The FDA has issued to the Company the IND approval letters
        listed on Schedule 2 to such opinion, and none of such approvals has
        been modified, revoked or rescinded.

               (v) The Company has filed the applications with foreign
        regulators listed on Schedule 3 to such letter (collectively, the
        "Foreign Applications"). No foreign authority has denied any of the
        Company's Foreign Applications, [other than as noted on Schedule 3].
        [Apart from such denied Foreign Applications,] such counsel is not aware
        of any material defect in form in the preparation or filing of the
        Foreign Applications, [other than as noted in Schedule 3]. To the
        knowledge of such counsel, [apart from such


                                       D-1
<PAGE>   39

        denied Foreign Applications,] the Applications are being diligently
        pursued by the Company, [other than as noted in Schedule 3]. To the
        knowledge of such counsel, the Company is the sole owner of the Foreign
        Applications, [other than as noted in Schedule 3].

               (vi) The foreign authorities named in Schedule 4 have issued to
        the Company the approvals listed on Schedule 4 to such opinion, and none
        of such approvals has been modified, revoked or rescinded.

               In addition, such counsel shall state that they have reviewed the
Registration Statement and Prospectus (including the documents incorporated
therein by reference) and, although such counsel is not passing upon and does
not assume any responsibility for the accuracy, completeness or fairness of any
statements contained in the Registration Statement or the Prospectus (other than
as specified above), and any supplements or amendments thereto, on the basis of
the foregoing, nothing has come to their attention which would lead them to
believe that either the Registration Statement (including the documents
incorporated therein by reference) or any amendments thereto, at the time the
Registration Statement or such amendments became effective, contained an untrue
statement of a material fact regarding the FDA Regulatory Matters or omitted to
state a material fact regarding the FDA Regulatory Matters required to be stated
therein or necessary to make the statements therein not misleading or that the
Prospectus (including the documents incorporated therein by reference), as of
its date or at the First Closing Date or the Second Closing Date, as the case
may be, contained an untrue statement of a material fact regarding the FDA
Regulatory Matters or omitted to state a material fact regarding the FDA
Regulatory Matters necessary in order to make the statements therein, in the
light of the circumstances under which they were made, not misleading (it being
understood that such counsel need express no belief as to the financial
statements or schedules or other financial or statistical data derived
therefrom, included or incorporated by reference in the Registration Statement
or the Prospectus or any amendments or supplements thereto).


                                      D-2



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