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                                                                   EXHIBIT 10.16

                      PHARMACEUTICAL DISCOVERY CORPORATION

                             1991 STOCK OPTION PLAN

                                    ARTICLE 1

                                     GENERAL

      1.1   Purpose. The purpose of this Pharmaceutical Discovery Corporation
1991 Stock Option Plan (the "Plan") is to provide for certain key employees of
Pharmaceutical Development Corporation, a Delaware corporation (the "Company"),
an incentive (1) to join and remain in the service of the Company, (ii) to
maintain and enhance the long-term performance and profitability of the Company
and its subsidiaries, and (iii) to acquire a proprietary interest in the success
of the Company.

      1.2   Definition of Certain Terms.

            (a)   "Agreement" means an agreement issued pursuant to Section 2.1.

            (b)   "Board" means the Board of Directors of the Company.

            (c)   "Code" means the Internal Revenue Code of 1986, as amended.

            (d)   "Committee" means the committee appointed to administer the
Plan in accordance with Section 1.3.

            (e)   "Common Stock" means the shares of common stock, no par value
per share, of the Company and any other shares into which such common stock
shall thereafter be

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exchanged by reason of a recapitalization, merger, consolidation, split-up,
combination, exchange of shares or the like.

            (f)   "Company" means Pharmaceutical Discovery Corporation.

            (g)   "Optionee" means an employee of the Company who has been
awarded any award under this Plan.

            (h)   "Options" means any incentive stock options or "nonqualified"
stock options, both as described in Section 1.5, granted under the Plan.

            (i)   "Plan" means the Pharmaceutical Discovery Corporation 1991
Stock Option Plan.

            (j)   "Termination With Cause," with respect to any Optionee, means
termination by the Company of such Optionee's employment for: (i)
misappropriation of corporate funds, (ii) conviction of a felony involving moral
turpitude, (iii) willful violation of reasonable written directions of the Chief
Executive Officer or the Board of Directors of the Company; or (iv) gross and
willful misconduct, provided, however, that no discharge shall be deemed
Termination With Cause under this clause (iv) unless such Optionee shall have
first received written notice from the Chief Executive Officer or the Board of
Directors of the Company advising such Optionee of the specific acts or
omissions alleged to constitute such gross and willful misconduct, and such
misconduct continues

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after such Optionee shall have had a reasonable opportunity to correct the
misconduct so complained of.

      1.3   Administration.

      (a)   (i) Subject to Section l.3(e), the Plan shall be administered by a
committee of the Board which shall consist of not less than three directors and
which shall have the power of the Board to authorize awards under the Plan. The
members of the Committee shall be appointed by, and may be changed from time to
time in the discretion of, the Board.

            (ii)  No person shall serve as a member of the Committee if such
person is then, or was at any time within one year prior thereto, eligible for
selection as a person to whom awards may be granted under the Plan, or under any
other plan of the Company or any of its affiliates entitling the participants
therein to acquire stock, stock options or stock appreciation rights of the
Company or any of its affiliates. The term "affiliate" as used in the preceding
sentence means any person or entity which, at the time of reference, directly,
or indirectly through one or more intermediaries, (i) controls the Company or
(ii) is controlled by, or is under common control with the Company.

      (b)   The Committee shall have the authority (i) to exercise all of the
powers granted to it under the Plan, (ii) to construe, interpret and implement
the Plan and any Agreement executed pursuant to Section 2.1, (iii) to
prescribe, amend and

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rescind rules and regulations relating to the Plan, (iv) to make all
determinations necessary or advisable in administering the Plan, and (v) to
correct any defect, supply any omission and reconcile any inconsistency in the
Plan.

      (c)   The determination of the Committee on all matters relating to the
Plan or any Agreement shall be conclusive.

      (d)   No member of the Committee shall be liable for any action or
determination made in good faith with respect to the Plan or any award
thereunder.

      (e)   Notwithstanding anything to the contrary contained herein: (i) until
the Board shall appoint the members of the Committee, the Plan shall be
administered by the Board; and (ii) the Board may, in its sole discretion, at
any time and from time to time, resolve to administer the Plan. In either of the
foregoing events, the term "Committee" as used herein shall be deemed to mean
the Board.

      1.4   Persons Eligible for Awards. Awards under the Plan may be made from
time to time to such key employees of the Company as the Committee shall in its
sole discretion select; provided, however, that an incentive stock option may
not be granted to an individual who is not also a common law employee of the
Company or one of its subsidiaries on the date of grant.

      1.5   Types of Awards Under Plan. Awards may be made under the Plan in the
form of (a) stock options which may, in

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the Committee's discretion, be granted either as (i) "nonqualified" stock
options subject to the provisions of section 83 of the Code, or (ii) "incentive
stock options" described in section 422 of the Code, all as more fully described
in Article 2.

      1.6   Shares Available for Awards.

      (a)   Subject to Section 3.4 (relating to adjustments upon changes in
capitalization), as of any date the total number of shares of Common Stock with
respect to which Options may be outstanding under the Plan shall be equal to the
excess (if any) of (i) 300 shares over (ii) the sum of (A) the number of shares
subject to outstanding Options granted under the Plan, (B) the number of shares
previously transferred pursuant to the exercise of Options granted under the
Plan. In accordance with (and without limitation upon) the preceding sentence,
shares of Common Stock covered by Options granted under the Plan which expire or
terminate for any reason shall again become available for award under the Plan.

      (b)   Shares of stock that shall be issued upon the exercise of Options
awarded under the Plan shall be authorized and unissued or treasury shares of
Common Stock.

      (c)   Without limiting the generality of the preceding provisions of this
Section 1.6, the Committee may, but solely with the Optionee's consent, agree to
cancel any award of Options under the Plan and issue a new award in substitution

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therefor, provided that the award as so substituted shall satisfy all of the
requirements of the Plan as of the date such new award is made.

                                   ARTICLE 2

                                 STOCK OPTIONS

      2.1   Agreements Evidencing Stock Options.

      (a)   Options awarded under the Plan shall be evidenced by written
agreements ("Agreements") which shall not be inconsistent with the terms and
provisions of the Plan, and, in the case of incentive stock options, of section
422 of the Code, and which shall contain such provisions as the Committee may in
its sole discretion deem necessary or desirable. Without limiting the generality
of the foregoing, the Committee may in any Agreement impose such restrictions or
conditions upon the exercise of such Option or upon the sale or other
disposition of the shares of Common Stock issuable upon exercise thereof as the
Committee may in its sole discretion determine. By accepting an award pursuant
to the Plan each Optionee shall thereby agree that each such award shall be
subject to all of the terms and provisions of the Plan, including but not
limited to the provisions of Section 1.3(d).

      (b)   Each Agreement shall set forth the number of shares of Common Stock
subject to the Option granted thereby.

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      (c)   Each Agreement shall set forth the amount payable by the Optionee to
the Company upon exercise of the option evidenced thereby. The option exercise
price of a "nonqualified" stock option shall not be less than 85% of the fair
market value of a share of Common Stock on the date the option is granted, and
in the case of an incentive stock option, the exercise price per share shall not
be less than the fair marketvalue (determined by the Committee in its sole
discretion) of a share of Common Stock on the date the option is granted.

      (d)   An Option granted under this Plan shall be an incentive stock option
only if the relevant Plan agreement by its terms (i) expressly sets forth the
rule described in Sections 2.5 and 2.6 hereof, and (ii) expressly states that it
is intended to qualify as an incentive stock option. Any Option granted under
this Plan which does not satisfy the foregoing requirements of this Section
2.1(d) is intended to be a nonqualified option subject to the provisions of
section 83 of the Code, and is intended not to qualify for incentive stock
option treatment under section 422 of the Code.

      2.2   Term of Options. Each Agreement shall set forth the period during
which the Option evidenced thereby shall be exercisable, whether in whole or in
part, such periods to be determined by the Committee in its discretion; provided
that, notwithstanding the foregoing or any other provision of

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the Plan, no Agreement shall permit a nonqualified option to be exercisable more
than 10 years after the date of grant; provided further that, notwithstanding
the foregoing or any other provision of the Plan, no Agreement shall permit an
incentive stock option to be exercisable more than 10 years after the date of
grant.

      2.3   Exercise of Options. Subject to the provisions of this Article 2,
each Option granted under the Plan shall be exercisable as follows:

      (a)   An Option shall become exercisable at such times and subject to such
conditions as the applicable Agreement may provide.

      (b)   Unless the applicable Agreement otherwise provides, an Option
granted under the Plan may be exercised from time to time as to all or part of
the shares as to which such Option shall then be exercisable.

      (c)   An Option shall be exercisable by the filing of a written notice of
exercise with the Company, on such form and in such manner as the Committee
shall in its sole discretion prescribe.

      (d)   Any written notice of exercise of an Option shall be accompanied by
payment of the exercise price for the shares being purchased. Such payment shall
be made by certified or official bank check payable to the Company (or the
equivalent thereof acceptable to the Committee). As soon as

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practicable after receipt of such payment, the Company shall deliver to the
Optionee a certificate or certificates for the shares of Common Stock so
purchased.

      2.4   Termination of Employment.

      (a)   Except as the Agreement may otherwise provide, all Options granted
to an Optionee (and not theretofore exercised) shall terminate within three
months of the Optionee's termination of employment with the Company for any
reason except for death.

      (b)   Notwithstanding anything to the contrary in this Plan, all Options
granted to an Optionee shall immediately expire and cease to be exercisable and
all rights granted to an Optionee under this Plan and such Optionee's Agreement
shall expire if such Optionee's employment with the Company is Terminated with
Cause by the Company at any time.

      2.5   $100,000 Annual Limitation on Incentive Stock Options Exercisable
            During Any Calendar Year.

      (a)   Subject to the further provisions of this Section 2.5, to the extent
that the aggregate fair market value of stock with respect to which incentive
stock options (determined without regard to the provisions of this Section 2.5)
are exercisable for the first time by any Optionee during any calendar year
(under all plans of the Optionee's employer corporation and its parent and
subsidiary corporations) exceeds $100,000, such options shall be treated as
options that are "nonqualified" stock options.

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      (b)   Fox purposes of Section 2.5(a), which shall be applied by taking
options into account in the order in which they were granted, the fair market
value of any stock shall be determined as of the time the option with respect to
such stock is granted.

      (c)   In applying the provisions of Section 2.5(a), there shall be taken
into account solely (i) incentive stock options granted to an Optionee under
this Plan, and (ii) incentive stock options granted to the Optionee after
December 31, 1986 under all other stock option plans of the Optionee's employer
corporation, and its parent or subsidiary corporations.

      (d)   The foregoing provisions of this Section 2.5 shall in no way limit
or restrict the aggregate fair market value of the stock which may become
exercisable in any calendar year under nonqualified options granted under the
Plan or under any other stock option plan of the Optionee's employer
corporation, or its parent or subsidiary corporations.

      2.6   Special Rules for 10% Stockholders.

      Notwithstanding any provisions to the contrary, an incentive stock option
may not be granted under this Plan to an individual who, at the time the option
is granted, owns stock possessing more than 10% of the total combined voting
power of all classes of stock of his employer corporation or of its parent or
subsidiary corporations (as such ownership may be determined for purposes of
section 422(b)(6) of the Code)

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unless (a) at the time such incentive stock option is granted the option
exercise price is at least 110% of the fair market value of the shares subject
to the incentive stock option and (b) the incentive stock option by its terms is
not exercisable after the expiration of 5 years from the date such incentive
stock option is granted.

                                    ARTICLE 3

                                  MISCELLANEOUS

      3.1   Amendment of the Plan; Modification of Awards.

            (a)   The Board may, without stockholder approval, from time to time
suspend or discontinue the Plan or revise or amend it in any respect whatsoever,
except that no such amendment shall alter or impair any rights or obligations
under any award theretofore made under the Plan without the consent of the
person to whom such award was made. Furthermore, except as and to the extent
otherwise permitted by Section 3.4, no such amendment shall, without stockholder
approval:

                  (i)   increase, beyond the amounts set forth in Section 1.6,
the number of shares of Common Stock in respect of which awards may be granted;

                  (ii)  change the designation in Section 1.4 of the class of
persons eligible to receive awards under the Plan; or

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                  (iii) extend the term of the Plan beyond the period set forth
in Section 3.12.

            (b)   With the consent of the Optionee and subject to the terms and
conditions of the Plan (including Section 3.1(a)), the Committee may amend
outstanding Agreements with such Optionee, including, without limitation, any
amendment which would (i) accelerate the time or times at which an award may be
exercised and/or (ii) extend the scheduled expiration date of the award.

      3.2   Nonassignability. No right granted to any Optionee under the Plan or
under any Agreement shall be assignable or transferable other than by will or by
the laws of descent and distribution. During the life of the Optionee, all
rights granted to the Optionee under the Plan or under any Agreement shall be
exercisable only by the Optionee.

      3.3   Withholding Taxes.

            (a)   The Company shall be entitled to withhold an amount sufficient
to satisfy any federal, state and other governmental withholding tax
requirements related thereto. Whenever under the Plan shares of Common Stock are
to be delivered upon exercise of an option, the Company shall be entitled to
require as a condition of delivery that the Optionee remit an amount sufficient
to satisfy all federal, state and other governmental withholding tax
requirements related thereto.

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      3.4   Adjustments Upon Changes in _Capitalization. If and to the extent
specified by the Committee, the number of shares of Common Stock which may be
transferred pursuant to the exercise of Options granted under the Plan may be
appropriately adjusted (as the Committee may determine) for any increase or
decrease in the number of issued shares of Common Stock resulting from the
subdivision or combination of shares of Common Stock or other capital
adjustments, or the payment of a stock dividend after the effective date of this
Plan, or other increase or decrease in the number of such shares of Common Stock
effected without receipt of consideration by the Company; provided, however,
that any Options to purchase fractional shares of Common Stock resulting from
any such adjustment may be eliminated. Adjustments under this Section shall be
made by the Committee, whose determination as to what adjustments shall be made,
and the extent thereof, shall be final, binding and conclusive.

      3.5   Right of Discharge Reserved. Nothing in this Plan or in any
Agreement shall confer upon any employee or otherperson the right to continue in
the employment or service of the Company or affect any right which the Company
may have to terminate the employment or service of such employee or other
person.

      3.6   No Rights as a Stockholder. No Optionee or other person exercising
an Option shall have any of the rights

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of a stockholder of the Company with respect to shares subject to an option
until the issuance of a stock certificate to the Optionee for such shares.
Except as otherwise provided in Section 3.4, no adjustment shall be made for
dividends, distributions or other rights (whether ordinary or extraordinary, and
whether in cash, securities or other property) for which the record date is
prior to the date such stock certificate is issued.

      3.7   Nature of Payments.

            (a)   Any and all payments of shares of Common Stock hereunder shall
be granted, transferred or paid in consideration of services performed for the
Company or for its subsidiaries by the Optionee.

            (b)   All such grants, issuances and payments shall constitute a
special incentive payment to the Optionee and shall not, unless otherwise
determined by the Committee, be taken into account in computing the amount of
salary or compensation of the Optionee for the purposes of determining any
pension, retirement, death or other benefits under (i) any Pension, retirement,
life insurance or other benefit plan of the Company or any subsidiary or (ii)
any agreement between the Company or any subsidiary, on the one hand, and the
Optionee, on the other hand.

      3.8   Non-Uniform Determinations. The Committee's determinations under the
Plan need not be uniform and may be

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made by it selectively among persons who receive, or are eligible to receive,
awards under the Plan (whether or not such persons are similarly situated).
Without limiting the generality of the foregoing, the Committee shall be
entitled, among other things, to make non-uniform and selective determinations,
and to enter into non-uniform and selective Agreements, as to (i) the persons to
receive awards under the Plan, and (ii) the terms and provisions of awards under
the Plan.

      3.9   Other Payments or Awards. Nothing contained in the Plan shall be
deemed in any way to limit or restrict the Company, any subsidiary or the
Committee from making any award or payment to any person under any other plan,
arrangement or understanding, whether now existing or hereafter in effect.

      3.10  Restrictions.

            (a)   If the Committee shall at any time determine that any Consent
(as hereinafter defined) is necessary or desirable as a condition of, or in
connection with, the granting of any award under the Plan, the issuance or
purchase of shares or other rights thereunder or the taking of any other action
thereunder (each such action being hereinafter referred to as a "Plan Action"),
then such Plan Action shall not be taken, in whole or in part, unless and until
such Consent shall have been effected or obtained to the full satisfaction of
the Committee.

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            (b)   The term "Consent" as used herein with respect to any Plan
Action means (i) any and all listing, registrations or qualifications in respect
thereof upon any securities exchange or under any federal, state or local law,
rule or regulation, (ii) any and all written agreements and representations by
the grantee with respect to the disposition of shares, or with respect to any
other matter, which the Committee shall deem necessary or desirable to comply
with the terms of any such listing, registration or qualification or to obtain
an exemption from the requirement that any such listing, qualification or
registration be made and (iii) any and all consents, clearances and approvals in
respect of a Plan Action by any governmental or other regulatory bodies.

      3.11  Section Headings. The section headings contained herein are for the
purposes of convenience only and are not intended to define or limit the
contents of said sections.

      3.12  Effective Date and Term of Plan.

            (a)   This Plan shall be deemed adopted and become effective upon
the approval thereof by the Board; provided that, notwithstanding any other
provision of this Plan, no award made under the Plan shall be exercisable unless
the Plan is approved by (1) the express consent of shareholders holding at least
a majority of the Company's voting Stock voting in person or by proxy at a duly
held shareholders'

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meeting, or (2) the unanimous written consent of shareholders of the Company,
within 12 months before or after the date the Plan is adopted.

            (b)   The Plan shall terminate 10 years after the earlier of the
date on which it is adopted or the date on which it is approved by shareholders,
and no awards shall thereafter be made under the Plan. Notwithstanding the
foregoing, all awards made under the Plan prior to such date shall remain in
effect until such awards have been satisfied or terminated in accordance with
the terms and provisions of the Plan.

      3.13  Registration.

            The Company will use its best efforts to cause a registration
statement with respect to the Common Stock issuable under the Plan, registering
such shares pursuant to the Securities Act of 1933, as amended, to be filed with
the Securities and Exchange Commission, eighteen months after such time as the
Company becomes a reporting corporation under Section 12 or 15 of the Securities
Exchange Act of 1934, as amended.

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                                                                   EXHIBIT 10.17

                      PHARMACEUTICAL DISCOVERY CORPORATION
                                 1999 STOCK PLAN

Section 1. PURPOSE OF PLAN

Pharmaceutical Discovery Corporation, a Delaware corporation (the "Company"),
hereby adopts the 1999 Stock Plan as set forth herein (this "Plan). The purpose
of this Plan is to enable the Company and its subsidiaries to attract, retain
and motivate their directors, employees, consultants and advisers by providing
for or increasing the proprietary interests of such persons in the Company,
thereby increasing the mutuality of interest between such persons and the
Company's stockholders.

Section 2. PERSONS ELIGIBLE UNDER PLAN

Any person, including any director of the Company, who is a director, employee,
consultant or adviser of the Company or any of its subsidiaries (a "Grantee")
shall be eligible to be considered for the grant of Awards (as hereinafter
defined) hereunder; provided, however, that only those Grantees who are
employees of the Company or any of its subsidiaries shall be eligible to be
considered for the grant of Incentive Stock Options (as hereinafter defined)
hereunder; provided, further, that Non-Employee Directors (as hereinafter
defined) shall be eligible only for Awards granted pursuant to Section 11 of
this Plan.

Section 3. AWARDS

      (a) The Board of Directors of the Company (the "Board") or the Committee
(as hereinafter defined), on behalf of the Company, is authorized under this
Plan to enter into any type of arrangement with a Grantee that is not
inconsistent with the provisions of this Plan and that, by its terms, involves
or might involve the issuance of (i) shares of Common Stock, par value $.01 per
share, of the Company (the "Common Shares") or (ii) a Derivative Security (as
such term is defined in Rule 16a-1 promulgated under the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), as such Rule may be amended from time
to time) with an exercise or conversion privilege at a price related to the
Common Shares or with a value derived from the value of the Common Shares. The
entering into of any such arrangement is referred to herein as the "grant" of an
"Award."

      (b) Awards are not restricted to any specified form or structure and may
include, without limitation, sales or bonuses of stock, restricted stock, stock
options, reload stock options, stock purchase warrants, other rights to acquire
stock, securities convertible into or redeemable for stock, stock appreciation
rights, limited stock appreciation rights, phantom stock, dividend equivalents,
performance units or performance shares, and an Award may consist of one such
security or benefit, or two or more of them in tandem or in the alternative.

      (c) Common Shares may be issued pursuant to an Award for any lawful
consideration as determined by the Committee, including, without limitation,
services rendered by the recipient of such Award.

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      (d) Awards in the form of options shall provide for an exercise price
which is not less than 85% of the fair value of the stock at the time the option
is granted, except that the price shall be 110% of the fair value in the case of
an Incentive Stock Option (as hereinafter defined) granted to any person who
owns stock possessing more than 10% of the total combined voting power of all
classes of stock of the Company. For purposes of this Paragraph (d) the fair
value of stock issuable upon exercise of an option shall be determined by the
Board of Directors of the Company or Committee taking into account the
following:

      (i) If Stock of the same class is publicly traded in an active market of
      substantial depth, the recent market price of such securities.

      (ii) If stock of the same class has not been so publicly traded the price
      at which securities of reasonably comparable corporations (if any) in the
      same industry are being traded subject to appropriate adjustment for the
      dissimilarities between corporations being compared.

      (iii) In the absence of any reliable indicator under subparagraph (i) and
      (ii) above, the earnings history, book value and prospects of the Company
      in the light of market conditions generally.

      (e) The exercise period for awards granted in the form of options shall be
not more than 120 months from the date the option is granted.

      (f) Awards granted in the form of options shall provide that the holder of
the option shall have the right to exercise in the event of termination of
employment, to the extent that the holder is entitled to exercise on the date
employment terminates, as follows:

            (i) At least six months from the date of termination if termination
            was caused by death or disability

            (ii) At least 30 days from the date of termination if termination
            was caused other than by death or disability.

      (g) Subject to the other specific provisions of this Plan, the Board or
the Committee, in its sole and absolute discretion, shall determine all of the
terms and conditions of each Award granted under this Plan, which terms and
conditions may include, among other things:

            (i) A provision permitting the recipient of such Award, including
            any recipient who is a director or officer of the Company, to pay
            the purchase price of the Common Shares or other property issuable
            pursuant to such Award, or such recipient's tax withholding
            obligation with respect to such issuance, in whole or in part, by
            any one or more of the following:

                  (A) the delivery of previously owned shares of capital stock
                  of the

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                  Company (including "pyramiding") or other property,

                  (B) a reduction in the amount of Common Shares or other
                  property otherwise issuable pursuant to such Award, or

                  (C) the delivery of a promissory note, the terms and
                  conditions of which shall be determined by the Committee; or

            (ii) A provision required in order for such Award to quality as an
            incentive stock option under Section 422 of the Internal Revenue
            Code (an "Incentive Stock Option").

Section 4. STOCK SUBJECT TO PLAN; ANNUAL GRANT LIMITATION

      (a) The aggregate number of Common Shares that may be issued pursuant to
all Incentive Stock Options granted under this Plan shall be 6,045,334. Such
maximum number does not include the number of Common Shares subject to the
unexercised portion of any Incentive Stock Option granted under this Plan that
expires or is terminated. Such maximum number of Common Shares is subject to
adjustment as provided in Section 7 hereof (and is referred to herein as the
"Share Limitation"). If any Award shall expire, terminate or be reacquired by
the Company for any reason, the unexercised or reacquired portion thereof shall
again be available for the grant of Awards hereunder.

      (b) At any time, the aggregate number of Common Shares issued and issuable
pursuant to all Awards (including all Incentive Stock Options) granted under
this Plan shall not exceed the Share Limitation, subject to adjustment as
provided in Section 7 hereof. Notwithstanding the foregoing, the Board may at
any time and from time to time increase the aggregate number of Common Shares
issued and issuable pursuant to all Awards granted under this Plan to a number
of Common Shares not exceeding fourteen percent (14%) of aggregate number of
Common Shares outstanding on an undiluted basis as shown on the then most recent
audited financial statement of the Company; provided that no such increase shall
in any event affect the aggregate number of Common Shares that may be issued
pursuant to all Incentive Stock Options granted under this Plan.

      (c) For purposes of Section 4(b) hereof, the aggregate number of Common
Shares issued and issuable pursuant to Awards granted under this Plan shall at
any time be deemed to be equal to the sum of the foregoing:

            (i) The number of Common Shares which were issued prior to such time
            pursuant to Awards granted under this Plan excluding (except for
            purposes of computing the Share Limitation applicable to Incentive
            Stock Options granted under this Plan) shares which were reacquired
            by the Company pursuant to provisions in the Awards with respect to
            which those shares where issued giving the Company the right to
            reacquire such shares upon the occurrence of certain events; plus

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            (ii) The number of Common Shares which are or may be issuable at or
            after such time pursuant to outstanding Awards granted under this
            Plan prior to such time.

      (d) In no event shall any Grantee receive, in any fiscal year, Awards
which exceed an aggregate of 500,000 Common Shares.

Section 5. DURATION OF PLAN

No Awards shall be granted under this Plan after October 15, 2009. Although
Common Shares may be issued after October 15,2009 pursuant to Awards granted
prior to such date, no Common Shares shall be issued under this Plan after
October 15, 2019.

Section 6. ADMINISTRATION OF PLAN

      (a) This Plan shall be administered by the Board or a committee thereof
(the "Committee") consisting of two or more non-employee directors.

      (b) Subject to the provisions of this Plan, the Board or the Committee
shall be authorized and empowered to do all things necessary or desirable in
connection with the administration of this Plan, including, without limitation,
the following:

            (i) Adopt, amend and rescind rules and regulations relating to this
            Plan;

            (ii) Determine which persons meet the requirements of Section 2
            hereof for eligibility under this Plan and to which of such eligible
            persons, if any, Awards shall be granted hereunder;

            (iii) Grant Awards to eligible persons and determine the terms and
            conditions thereof, including the number of Common Shares issuable
            pursuant thereto;

            (iv) Determine whether, and the extent to which, adjustments are
            required pursuant to Section 7 hereof; and

            (v) Interpret and construe this Plan and the terms and conditions of
            any Award granted hereunder.

Section 7. ADJUSTMENTS; ACCELERATION UPON CHANGE IN CONTROL

      (a) Adjustments. If the outstanding securities of the class then subject
to this Plan are increased, decreased or exchanged for or converted into a
different number or kind of shares or securities of the Company as a result of a
reorganization, merger, consolidation, recapitalization, restructuring,
reclassification, stock dividend, stock split, reverse stock split or the like,
then, unless the terms of such transaction or document evidencing an Award shall
provide otherwise, the Committee may make appropriate and proportionate
adjustments in (i) the number and type of shares or other securities of the
Company that may be acquired pursuant to Incentive Stock

<PAGE>

Options and other Awards theretofore granted under this Plan and (ii) the
maximum number and type of shares or other securities of the Company that may be
issued pursuant to Incentive Stock Options and other Awards thereafter granted
under this Plan.

      (b) Acceleration. Each outstanding Award shall, except as otherwise
provided in any applicable agreement or instrument evidencing an Award granted
after the effectiveness of this Plan (as set forth in Section 9 hereof), become
exercisable in full for the aggregate number of Common Shares covered thereby,
or shall vest unconditionally, in the event of (i) the acquisition by any single
entity or group of at least fifty percent (50%) of the outstanding voting
securities of the Company or (ii) a sale of all or substantially all of the
assets of the Company to another person or entity other than an affiliate of the
Company, or a reorganization, merger, business combination or consolidation of
the Company as a result of which in both cases at least 50% of the voting
securities of the Company or its successor are held, directly or indirectly, by
persons or entities who did not hold at least 50% of the voting securities of
the Company immediately prior to such transaction. The Committee may also, in
its discretion, accelerate the exercisability or vesting of any Award granted
hereunder in accordance with the administration of this Plan. For purposes of
(i) above, "group" shall have the meaning set forth in Rule 13d-5 of the
Securities and Exchange Commission under the Exchange Act, and shall include as
to each person, entity or group, each "affiliate" of that person, entity or
group, as that term is defined in Rule 12b-2 of the Securities and Exchange
Commission under the Exchange Act. The terms "person," "entity" and "group" as
used in (i) above shall not include the Company or any of its subsidiaries, any
employee benefit plan of the Company or any of its subsidiaries, any entity
holding voting securities of the Company for or pursuant to the terms of any
such plan. Securities will be deemed to constitute 50% of the voting securities
of the Company or its successor if the holders thereof collectively have the
power to elect at least 50% of the directors or, if the successor is not a
corporation, 50% of the other analogous controlling persons. In order to permit
the grantee of any Award which is outstanding upon the occurrence of any of the
events referred to in (i) or (ii) above to receive the same consideration as a
result of such event as would the holder of the outstanding shares of Common
Stock of the Company subject to the Award, the grantee will have the right to
give notice of the exercise of the option or other analogous right included in
the Award in advance of the occurrence of the events described in (i) or (ii)
above effective upon the occurrence of such event, and any such exercise shall
be deemed effective upon the occurrence of the event and prior to any
termination of the Award as a result of the event.

Section 8. AMENDMENT AND TERMINATION OF PLAN

The Board may amend or terminate this Plan at any time and in any manner,
provided, however, that (a) no such amendment or termination shall deprive the
recipient of any Award theretofore granted under this Plan, without the consent
of such recipient, of any of his or her rights thereunder or with respect
thereto; and (b) no such amendment shall increase the aggregate number of Common
Shares that may be issued to all Incentive Stock Options granted under this Plan
(except pursuant to Section (a) 7 hereof) or change, alter or modify the
employees or class of employees eligible to receive Incentive Stock Options
under this Plan without the approval of the stockholders of the Company, which
approval must be obtained within 12 months after the adoption of such amendment
by the Board.

<PAGE>

Section 9. EFFECTIVENESS OF THE PLAN

This Plan shall become effective as of the date of approval by the vote of a
majority of the voting securities of the Company present, either in person or by
proxy, and entitled to vote at a duly constituted meeting of shareholders of the
Company at which a quorum is present throughout. Prior to such approval, Awards
may be granted under this Plan, provided that the exercise and/or vesting of
Awards so granted shall be expressly subject to the condition that this Plan
shall have been so approved. Unless this Plan shall be so approved, this Plan
and all Awards theretofore made hereunder shall become null and void.

Section 10. STOCK EXCHANGE REQUIREMENTS; APPLICABLE LAWS

Notwithstanding anything to the contrary in this Plan, Common Shares purchased
upon exercise of an Award, and certificates representing all or any part of such
shares, shall be issued or delivered only if (a) such shares have been admitted
to listing upon official notice of issuance on each stock exchange upon which
shares of that class are then listed or (b) in the opinion of counsel to the
Company, such issuance or delivery would not cause the Company to be in
violation of or to incur liability under any Federal, state or other securities
law, or any requirement of any listing agreement to which the Company is a party
or any other requirement of law or of any administrative or regulatory body
having jurisdiction over the Company.

Section 11. NON-EMPLOYEE DIRECTOR AWARDS

Notwithstanding anything to the contrary contained herein or in any agreement
evidencing any Award hereunder, each member of the Board who is not an employee
of the Company ("Non-Employee Directors") shall be eligible for Awards only
issued pursuant to and in accordance with the terms of this Section 11.

      (a) Eligibility. Subject to the terms and conditions of this Plan, all
Non-Employee Directors of the Company shall automatically become participants in
this Plan under this Section 11 upon their election as directors of the Company.

      (b) Automatic Option Grants. Each person who becomes a Non-Employee
Director shall automatically be awarded and issued on the date of his or her
first such election and without further action of the Board, a nonqualified
stock option to purchase shares of Common Stock of the Company. Such grant shall
hereinafter be referred to as an "Initial Grant." If the date designated in this
subjection for any Initial Grant is not a trading day of the Common Stock and
the Common Stock is then traded, such Initial Grant shall be made on the first
trading day which follows such designated date.

On June 1 of each year (or, in any year, if such day is not a trading day for
the Common Stock and the Common Stock is then traded, the first trading day
thereafter), each Non-Employee Director (other than a Non-Employee Director who
received an Initial Grant within twelve months) shall be automatically awarded
and issued on such date, without further action of the

<PAGE>

Board or Committee, a nonqualified stock option to purchase 5,000 shares of
Common Stock of the Company (an "Annual Grant"); provided that, in the case of a
Non-Employee Director who received an Annual Grant within 12 months, the number
of shares covered by such Annual Grant shall be 10,000 multiplied by a fraction,
the numerator of which is the number of days elapsed from the date of such
Initial Grant until the next succeeding Annual Grant, and the denominator of
which is 365.

      (c) Option Prices. The purchase price of the Common Stock under each
option granted pursuant to this Section 11 shall be 100% of the fair value of
the Common Stock on the grant date determined under Paragraph (D) of Section 3
if at that time the Common Stock is not traded and the Fair Market Value of the
Common Stock on the grant date if at that time the Common Stock is traded. The
"Fair Market Value" of a share of Common Stock or of a share of another class of
capital stock of the Company on any day shall be equal to the last sale price,
regular way, of such a share on the business day preceding such day or, in case
no such sale takes place on such day and there were sales within a reasonable
period before the date for which the Fair Market Value is to be determined, the
mean between the lowest and highest sales prices, regular way, on the nearest
date before the date as of which the Fair Market Value is to be determined, in
either case as reported in the principal consolidated transaction reporting
system with respect to securities listed or admitted to trading or the principal
national securities exchange on which such shares are listed or admitted to
trading or, if such shares are not listed or admitted to trading on any national
securities exchange, the last quoted price, or if not so quoted, the average of
the high bid and low asked prices in the over-the-counter market, as reported by
the National Association of Securities Dealers, Inc. Automated Quotations System
or such other system then in use. If none of the foregoing provisions for
determining Fair Market Value are applicable, the Fair Market Value will be
determined by the Board or the Committee.

      (d) Term of Options. The term of each option issued to Non-Employee
Directors hereunder shall be for a period of eight years from the grant date.

            (i) Termination of Director Status.

                  (A) Death or Permanent Disability. In the event that a
                  Non-Employee Director shall cease to be a Non-Employee
                  Director of the Company or any of its subsidiaries (such event
                  shall be referred to herein as a "Terminating Event") by
                  reason of the death or Permanent Disability (as hereinafter
                  defined) of a Non-Employee Director, then (1) the option shall
                  terminate on the first anniversary of the date of such
                  Terminating Event and (2) the option shall be exercisable
                  during that one year period by the Non-Employee Director or,
                  in the event of death or a Permanent Disability involving the
                  appointment of a guardian, custodian or other similar personal
                  representative, the person or persons to whom the Non-Employee
                  Directors'rights under the option shall have passed by will or
                  by the applicable laws of descent or distribution or as a
                  result of any such appointment, only to the extent that it was
                  exercisable on the date of such death or Permanent Disability.
                  "Permanent Disability" shall mean the

<PAGE>

                  inability to engage in any substantial gainful activity by
                  reason of any medically determinable physical or mental
                  impairment which can be expected to result in death or which
                  has lasted or can be expected to last for a continuous period
                  of not less than twelve (12) months. The Non-Employee Director
                  shall not be deemed to have a Permanent Disability unless
                  proof of the existence thereof shall have been furnished to
                  the Committee in such form and manner, and at such times, as
                  the Committee may require. Any determination by the Committee
                  that a Non-Employee Director does or does not have a Permanent
                  Disability and/or the date thereof shall be final and binding
                  upon the Company and the Non-Employee Director.

                  (B) Other Termination. If the Terminating Event is for any
                  reason other than those enumerated in Subparagraph
                  11(d)(i)(A), the option shall terminate one (1) month from the
                  date of such Terminating Event and shall be exercisable only
                  to the extent it was exercisable on the date of the
                  Terminating Event.

            (ii) Death Following the Terminating Event. If a Non-Employee
            Director shall die at any time after the occurrence of a Terminating
            Event and prior to the last date on which the option could have been
            exercised as provided above, then, to the extent that the option was
            exercisable on the date of such Terminating Event, the option shall
            terminate on the earlier of the date on which such option otherwise
            would expire or the first anniversary of the date of such death.

            (iii) Other Terminating Events. An option granted pursuant to this
            Section 11 shall terminate upon the dissolution or liquidation of
            the Company unless the terms of the plan of dissolution or
            liquidation provide otherwise.

      (e) Vesting of Options. Each option granted to a Non-Employee Director
pursuant to this Section 11 shall become exercisable immediately on the date of
the grant to the extent of 25% of the shares of Common Stock covered by such
option, and shall become exercisable on each subsequent anniversary of the Grant
Date to the extent of an additional 25% of the shares Common Stock covered by
the Option until such option becomes fully exercisable.

      (f) No Right to Continue as Director. Nothing contained in this Plan or in
any agreement evidencing an Award granted hereunder to a Non-Employee Director
shall confer any right to continue as a director or shall any way affect the
right and power of the stockholders of the Company to remove such participant as
a member of the Board at any time, to the same extent as might have been done if
this Plan had not been adopted.

      (g) Limitation on Amendments. This Section 11 may not be amended more than
once every six months, other than to comport with changes in the Internal
Revenue Code, the Employee Retirement Income Security Act, or the rules
thereunder.

<PAGE>

NEITHER THIS AWARD NOR THE SECURITIES WHICH MAY BE ISSUED UPON THE EXERCISE
HEREOF HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
"ACT"), OR ANY STATE SECURITIES LAWS AND NEITHER THIS AWARD NOR ANY INTEREST
THEREIN MAY BE OFFERED, SOLD, PLEDGED, ASSIGNED OR OTHERWISE TRANSFERRED UNLESS
(1) A REGISTRATION STATEMENT WITH RESPECT THERETO IS EFFECTIVE UNDER THE ACT AND
ANY APPLICABLE STATE SECURITIES LAWS, OR (2) THE COMPANY RECEIVES AN OPINION OF
COUNSEL TO THE HOLDER OF THIS AWARD, WHICH COUNSEL AND OPINION ARE REASONABLY
SATISFACTORY TO THE COMPANY, THAT THIS AWARD AND THE SECURITIES WHICH MAY BE
ISSUED UPON THE EXERCISE HEREOF MAY BE OFFERED, SOLD, PLEDGED, ASSIGNED OR
TRANSFERRED IN THE MANNER CONTEMPLATED WITHOUT AN EFFECTIVE REGISTRATION
STATEMENT UNDER THE ACT OR APPLICABLE STATE SECURITIES LAWS

                      PHARMACEUTICAL DISCOVERY CORPORATION
                            1999 STOCK INCENTIVE PLAN

                               STOCK OPTION AWARD

      This Stock Option Award ("Award") is made as of the Date of Grant
indicated below by Pharmaceutical Discovery Corporation, a Delaware corporation
(the "Company"), for the benefit of the person named below as Grantee.

      WHEREAS, Grantee is a director, employee, consultant or adviser of the
Company and/or one or more of its subsidiaries; and

      WHEREAS, pursuant to the Company's 1999 Stock Incentive Plan (the "Plan"),
the Board of Directors of the Company (the "Board") or the Committee thereof
appointed by the Board to administer the Plan (the "Committee") has approved the
grant to Grantee of an option to purchase shares of the Common Stock, par value
$.01 per share, of the Company (the "Common Stock"), on the terms and conditions
set forth herein;

      NOW, THEREFORE, in consideration of the foregoing recitals and the
covenants set forth herein, the Company hereby agrees, and by accepting this
Award the Grantee agrees, as follows:

1. Grant of Option; Certain Terms and Conditions. The Company hereby grants to
Grantee, as of the Date of Grant indicated below, an option to purchase the
number of shares of Common Stock indicated below (the "Option Shares") at the
Exercise Price per share indicated below, which option shall expire at 5:00
o'clock p.m., East Coast time, on the Expiration Date indicated below and shall
be subject to all of the terms and set forth in this Award (the "Option"). On
each anniversary of the Date of Grant, the Option shall become exercisable to
purchase that number of Option Shares (rounded to the nearest whole share) equal
to the total number of Option Shares multiplied by the Annual Vesting Rate
indicated below.

                                                                     Page l of 6

<PAGE>

Grantee:

Date of Grant:

Number of shares purchasable:                           10,000

Exercise Price per share:                               $

Expiration Date:

Annual Vesting Rate:                                    25%

<TABLE>
<CAPTION>
Cumulative Number of Shares                            Applicable Date
---------------------------                            ---------------
<S>                                                    <C>
2,500 Shares                                            April 12, 2001
2,500 Shares                                            April 12, 2002
2,500 Shares                                            April 12, 2003
2,500 Shares                                            April 12, 2004
</TABLE>

The Option is intended to qualify as an incentive stock option under Section 422
of the Internal Revenue Code.

      2.    Termination of Option.

      (a)   Termination of Employment or Arrangement.

            (i) Retirement. If Grantee shall cease to be a director or employee
of the Company or any of its subsidiaries or shall cease to be a consultant or
adviser to the Company or any of its subsidiaries, as determined by the
Committee (such event shall be referred to herein as the "Termination" of
Grantee's "Employment") by reason of Grantee's retirement in accordance with the
Company's or any applicable employer's then-current retirement policy
("Retirement"), then (A) the Option shall terminate on the earlier of the
Expiration Date or the date of such Retirement as to the number of shares for
which it has not then become exercisable and (B) the Option shall terminate as
to the number of shares for which it has then become exercisable upon the
earlier of the Expiration Date or 30 days after the date of such Retirement. The
date of Grantee's Retirement shall be the date Grantee ceases to provide
services to the Company regardless of whether Grantee continues on the Company's
payroll for some time thereafter; provided, however, that the Board may extend
said 30 day period for a period not to exceed one year but not in any event
beyond the Expiration Date.

            (ii) Death or Permanent Disability. If Grantee's Employment is
Terminated by reason of the death or Permanent Disability (as hereinafter
defined) of Grantee, then (A) the Option shall terminate on the earlier of the
Expiration Date or the date of such Termination as to the number of shares for
which it has not then become exercisable and (B) the Option shall terminate as
to the number of shares for which it has then become exercisable upon the
earlier of the Expiration Date or the first anniversary of the date of such
Termination of Employment.

                                                                     Page 2 of 6

<PAGE>

"Permanent Disability" shall mean the inability to engage in any substantial
gainful activity by reason of any medically determinable physical or mental
impairment which can be expected to result in death or which has lasted or can
be expected to last for a continuous period of not less than 12 months. Grantee
shall not be deemed to have a Permanent Disability until proof of the existence
thereof shall have been furnished to the Board in such form and manner, and at
such times, as the Board may require. Any determination by the Board that
Grantee does or does not have a Permanent Disability shall be final and binding
upon the Company and Grantee.

            (iii) Other Termination. If Grantee's Employment is Terminated for
no reason, or for any reason other than Retirement, death or Permanent
Disability, then (A) the Option shall terminate on the earlier of the date of
the Expiration Date or the date of such Termination as to the number of shares
for which it has not then become exercisable and (B) the Option shall terminate
as to the number of shares for which it has then become exercisable upon the
earlier of the Expiration Date or 30 days after the date of such Termination of
Employment, which Termination date shall be the date Grantee ceases to provide
services to the Company regardless of whether Grantee continues on the Company's
payroll for some time thereafter.

      (b) Death Following Certain Terminations of Employment. Notwithstanding
anything to the contrary in this Award, if Grantee shall die at any time after
the Termination of his or her Employment and prior to the earlier of the
Expiration Date or the date the Option would terminate as to shares for which it
is then exercisable pursuant to clauses (a) (i) or (iii) above, to the extent
that the Option was exercisable on the date of such death the Option shall
terminate on the earlier of the Expiration Date or the first anniversary of the
date of such death.

      (c) Other Events Causing Termination of Option. Notwithstanding anything
to the contrary in this Award, the Option shall terminate upon the consummation
of any of the following events:

            (i) the dissolution or liquidation of the Company, or,

            (ii) a reorganization, merger or consolidation of the Company as a
result of which the outstanding securities of the class then subject to the
Option are exchanged for or converted into cash, property and/or securities not
issued by the Company unless provision is made in writing in connection with any
such transaction for the assumption of the Option or the substitution for the
Option of a new option covering the stock of a successor entity, or a parent or
subsidiary thereof, or of the Company, with appropriate adjustments as to the
number and kind of shares and price; or

            (iii) a sale of substantially all of the property and assets of the
Company.

      3.    Adjustments. In the event that the outstanding securities of the
class then subject to the Option are increased, decreased or exchanged for or
converted into a different number or kind of shares or securities of the Company
as a result of a reorganization, merger, consolidation, recapitalization,
reclassification, stock dividend, stock split, reverse stock split or the like,
then, unless such event shall cause the Option to terminate pursuant to Section
2 (c) hereof or the terms of

                                                                     Page 3 of 6

<PAGE>

such transaction shall provide otherwise, the Board or the Committee may make
appropriate and proportionate adjustments in the number and type of shares or
other securities of the Company that may thereafter be acquired upon the
exercise of the Option; provided, however, that any such adjustments in the
Option shall be made without changing the aggregate Exercise Price of the then
unexercised portion of the Option.

      4.    Exercise. Unless the Option is transferred as permitted by Section
8, the Option shall be exercisable during Grantee's lifetime only by Grantee or
by his or her guardian or legal representative, and after Grantee's death only
by the person or entity entitled to do so under Grantee's last will and
testament or applicable intestate law. If the Option is transferred as permitted
by Section 8, the Option shall be exercisable by the transferee or, in the event
of the transferee's death, by the person or entity entitled to do so under the
transferee's last will and testament or applicable intestate law. The Option may
not be exercised with respect to any fractional share; cash shall be paid in
lieu of fractional shares. The Option may only be exercised by the delivery to
the Company of a written notice of such exercise, which notice shall be in a
form reasonably satisfactory to the Company and shall specify the number of
shares to be purchased (the "Purchased Shares") and the aggregate Exercise Price
for such shares (the "Exercise Notice"). By delivering the Exercise Notice, the
Grantee shall be deemed to have agreed to pay or cause to be paid, and shall so
pay or cause to be paid, in full such aggregate Exercise Price within five (5)
business days of receipt by the Company of the Exercise Notice. Such payment
shall be in cash or by wire transfer or check payable to the Company.

      As promptly as practicable following the receipt of an Exercise Notice
hereunder, the Company shall issue a stock certificate registered in the name of
the Grantee or his or her designee, representing the number of shares issued to
the Grantee upon exercise of the Option.

      5.    Payment of Withholding Taxes. If the Company becomes obligated to
withhold an amount on account of any tax imposed as a result of the exercise of
the Option, including, without limitation, any federal, state, local or other
income tax, or any FICA, state disability insurance tax or other employment tax,
then, by exercising the Option Grantee shall be deemed to have agreed to pay or
cause to be paid, and shall pay or cause to be paid, such amount required to be
withheld in cash or by wire transfer or check, concurrently with paying the cash
portion of the Exercise Price or, if no portion of the Exercise Price is being
paid in cash, concurrently with the delivery of the Exercise Notice to the
Company.

      6.    Notices. All notices and other communications required or permitted
to be given pursuant to this Award shall be in writing and shall be deemed given
if delivered personally or five days after mailing by certified or registered
mail, postage prepaid, return receipt requested, to the Company at 33 West Main
Street, Elmsford, New York 10523, Attention: Corporate Secretary, or to Grantee
at the residence address of Grantee set forth in the records of the Company, or
at such other addresses as they may designate by written notice in the manner
aforesaid.

      7.    Stock Exchange Requirements; Applicable Laws. Notwithstanding
anything to the contrary in this Award, no shares of stock purchased upon
exercise of the Option, and no certificate representing all or any part of such
shares, shall be issued or delivered if (a) such shares have not

                                                                     Page 4 of 6

<PAGE>

been admitted to listing upon official notice of issuance on each stock exchange
upon which shares of that class are then listed or (b) in the opinion of counsel
to the Company, such issuance or delivery may cause the Company to be in
violation of or to incur liability under any federal, state or other securities
law, or any requirement of any stock exchange listing agreement to which the
Company is a party, or any other requirement of law or of any administrative or
regulatory body having jurisdiction over the Company.

      8.    Limited Transferability. Neither the Option nor any interest therein
may be sold, assigned, conveyed, gifted, pledged, hypothecated or otherwise
transferred in any manner other than (i) by will or the laws of descent and
distribution, (ii) by gift to a family member, (iii) by a domestic relations
order to a family member in settlement of marital property rights, (iv) by
transfer to an entity in which more than fifty present of the voting interests
are owned by family members (or the Grantee) in exchange for an interest in that
entity or (v) by transfer to a trust for the sole benefit of the Grantee or any
of the foregoing. "Family member" means any child, stepchild, grandchild,
parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew,
mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or
sister-in-law, including adoptive relationships, any person sharing the
Grantee's household (other than a tenant or employee), a trust in which these
persons (or the Grantee) have more than fifty percent of the beneficial
interest, a foundation in which these persons (or the Grantee) control the
management of assets, and any other entity in which these persons (or the
Grantee) own more than fifty percent of the voting interests. Except as set
forth in (iii), (iv) or (v) above, the Option cannot be transferred for value.
In the event of a transfer permitted by this Section 8 the transferee shall have
all of the rights and obligations of the Grantee under this Award, but all
references in Section 2 to the Termination of the Option upon the Termination of
Grantee's employment, retirement, death or permanent disability shall be deemed
to refer to those events as they affect Grantee and not to such events with
respect to the transferee and Grantee shall continue to be responsible to the
Company for all federal, state and local taxes payable as a result of the
exercise of the Option. In the event of such transfer, the transferee and
Grantee shall give written notice thereof to the Company, which notice shall
include the name, address and social security number of the transferee.

      9.    Plan. The Option is granted pursuant to the Plan, as in effect on
the Date of Grant, and is subject to all the terms and conditions of the Plan,
as the same may be amended from time to time; provided, however, that no such
amendment shall deprive Grantee, without his or her consent, of the Option or of
any of Grantee's rights under this Award. The interpretation and construction by
the Board or the Committee of the Plan, this Award, the Option and such rules
and regulations as may be adopted by the Board or the Committee for the purpose
of administering the Plan shall be final and binding upon Grantee. Until the
Option shall expire, terminate or be exercised in full, the Company shall, upon
written request therefor, send a copy of the Plan, in its then-current form, to
Grantee or any other person or entity than entitled to exercise the Option.

      10.   Stockholder Rights. No person or entity shall be entitled to vote,
receive dividends or be deemed for any purpose the holder of any shares until
the Option shall have been duly exercised to purchase such Option Shares in
accordance with the provisions of this Award.

      11.   Employment Rights. No provision of this Award or of the Option
granted

                                                                     Page 5 of 6

<PAGE>

hereunder shall (a) confer upon Grantee any right to continue in the employ of,
or in its current arrangement with, the Company or any of its subsidiaries, (b)
affect the right of the Company and each of its subsidiaries to terminate the
employment of Grantee, or such arrangement, with or without cause, or (c) confer
upon Grantee any right to participate in any employee welfare or benefit plan or
other program of the Company or any of its subsidiaries other than the Plan.
Grantee, if he or she is an employee of the Company or any of its subsidiaries,
hereby acknowledges and agrees that the Company and each of its subsidiaries may
terminate the employment of Grantee at any time and for any reason, or for no
reason, unless Grantee and the Company or such subsidiary are parties to a
written employment agreement that expressly provides otherwise.

      12.   Governing Law This Award and the Option granted hereunder shall be
governed by and construed and enforced in accordance with the laws of the State
of Delaware.

      13.   Fair Market Value. The "Fair Market Value" of a share of Common
Stock or of a share of another class of capital stock of the Company on any day
shall be equal to the last sale price, regular way, of such a share on the
business day preceding such day or, in case no such sale takes place on such day
and there were sales within a reasonable period before the date for which the
Fair Market Value is to be detained, the mean between the lowest and highest
sale prices, regular way, on the nearest date before the date as of which the
Fair Market Value is to be determined, in either case as reported in the
principal consolidated transaction reporting system with respect to securities
listed or admitted to trading on the principal national securities exchange on
which such shares are listed or admitted to trading or, if such shares are not
listed or admitted to trading on any national securities exchange, the last
quoted price, or if not so quoted, the average of the high bid and low asked
prices in the over-the-counter market, as reported by the National Association
of Securities Dealers, Inc. Automated Quotations System or such other system
then in use. If none of the foregoing provisions for determining Fair Market
Value are applicable, the Fair Market Value will be determined by the Board or
the Committee.

IN WITNESS WHEREOF, the Company has fully executed this Award as of the Date of
Grant.

                  PHARMACEUTICAL DISCOVERY CORPORATION.

                  By: ________________________
                            Chairman

Agreed to this ___ of ______, 200_

By: ____________________________________
    "Optionee"

                                                                     Page 6 of 6

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