VERSICOR INC /CA
S-1/A, EX-10.6, 2000-06-09
PHARMACEUTICAL PREPARATIONS
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                                  VERSICOR INC.
                          EMPLOYEE STOCK PURCHASE PLAN

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                                TABLE OF CONTENTS

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                                                                                                               Page
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1.       PURPOSE.................................................................................................1

2.       DEFINITIONS.............................................................................................1

3.       ELIGIBILITY.............................................................................................4

4.       STOCK SUBJECT TO THIS PLAN; SHARE LIMITATIONS...........................................................4

5.       OFFERING PERIODS........................................................................................4

6.       PARTICIPATION...........................................................................................5

7.       METHOD OF PAYMENT OF CONTRIBUTIONS......................................................................5

8.       GRANT OF OPTION.........................................................................................7

9.       EXERCISE OF OPTION......................................................................................7

10.      DELIVERY................................................................................................8

11.      TERMINATION OF EMPLOYMENT; CHANGE IN ELIGIBLE STATUS....................................................8

12.      ADMINISTRATION..........................................................................................9

13.      DESIGNATION OF BENEFICIARY.............................................................................10

14.      TRANSFERABILITY........................................................................................11

15.      USE OF FUNDS; INTEREST.................................................................................11

16.      REPORTS................................................................................................11

17.      ADJUSTMENTS OF AND CHANGES IN THE STOCK................................................................11

18.      POSSIBLE EARLY TERMINATION OF PLAN AND OPTIONS.........................................................12

19.      TERM OF PLAN; AMENDMENT OR TERMINATION.................................................................12

20.      NOTICES................................................................................................13

21.      CONDITIONS UPON ISSUANCE OF SHARES.....................................................................13

22.      PLAN CONSTRUCTION......................................................................................13

23.      EMPLOYEES' RIGHTS......................................................................................14

24.      MISCELLANEOUS..........................................................................................14

25.      EFFECTIVE DATE.........................................................................................15

26.      TAX WITHHOLDING........................................................................................15

27.      NOTICE OF SALE.........................................................................................16
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                                                       -i-
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                                  VERSICOR INC.
                          EMPLOYEE STOCK PURCHASE PLAN

         The following constitute the provisions of the Versicor Inc. Employee
Stock Purchase Plan (the "PLAN").

1.       PURPOSE

         The purpose of this Plan is to assist Eligible Employees in acquiring a
         stock ownership interest in the Corporation, at a favorable price and
         upon favorable terms, pursuant to a plan which is intended to qualify
         as an "employee stock purchase plan" under Section 423 of the Code.
         This Plan is also intended to encourage Eligible Employees to remain in
         the employ of the Corporation (or a Subsidiary which may be designated
         by the Committee as "Participating Subsidiary") and to provide them
         with an additional incentive to advance the best interests of the
         Corporation.

2.       DEFINITIONS

         Capitalized terms used herein which are not otherwise defined shall
         have the following meanings.

                  "ACCOUNT" means the bookkeeping account maintained by the
                  Corporation, or by a recordkeeper on behalf of the
                  Corporation, for a Participant pursuant to Section 7(a).

                  "BOARD" means the Board of Directors of the Corporation.

                  "CODE" means the Internal Revenue Code of 1986, as amended
                  from time to time.

                  "COMMITTEE" means the committee appointed by the Board to
                  administer this Plan pursuant to Section 12.

                  "COMMON STOCK" means the Common Stock, par value $.001 per
                  share, of the Corporation, and such other securities or
                  property as may become the subject of Options pursuant to an
                  adjustment made under Section 17.

                  "COMPANY" means, collectively, the Corporation, its Parent and
                  its Subsidiaries (if any).

                  "COMPENSATION" means an Eligible Employee's regular gross pay
                  for a 40-hour week. Compensation includes any amounts
                  contributed as salary reduction contributions to a plan
                  qualifying under Section 401(k), 125 or 129 of the Code. Any
                  other form of remuneration is excluded from Compensation,
                  including (but not limited to) the following: overtime
                  payments, commissions, prizes, awards, relocation or housing
                  allowances, stock option exercises, stock appreciation rights,
                  restricted stock exercises, performance awards, auto
                  allowances, tuition reimbursement and other forms of imputed
                  income, bonuses, incentive


                                       1

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                  compensation, special payments, fees and allowances.
                  Notwithstanding the foregoing, Compensation shall not include
                  any amounts deferred under or paid from any nonqualified
                  deferred compensation plan maintained by the Company.

                  "CONTRIBUTIONS" means all bookkeeping amounts credited to the
                  Account of a Participant pursuant to Section 7(a).

                  "CORPORATION" means Versicor Inc., a Delaware corporation, and
                  its successors.

                  "EFFECTIVE DATE" means [____________], the date this Plan was
                  adopted by the Board.

                  "ELIGIBLE EMPLOYEE" means any employee of the Corporation, or
                  of any Subsidiary which has been designated in writing by the
                  Committee as a "Participating Subsidiary" (including any
                  Subsidiaries which have become such after the date that this
                  Plan is approved by the stockholders of the Corporation).
                  Notwithstanding the foregoing, "Eligible Employee" shall not
                  include any employee:

                  (a)      whose customary employment is for 20 hours or less
                           per week; or

                  (b)      whose customary employment is for not more than five
                           months in a calendar year.

                  "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
                  amended from time to time.

                  "EXERCISE DATE" means, with respect to an Offering Period, the
                  last day of that Offering Period.

                  "FAIR MARKET VALUE" on any date means:

                  (a)      if the Common Stock is listed or admitted to trade on
                           a national securities exchange, the closing price of
                           a Share on the Composite Tape, as published in the
                           Western Edition of The Wall Street Journal, of the
                           principal national securities exchange on which such
                           stock is so listed or admitted to trade, on such
                           date, or, if there is no trading of the Common Stock
                           on such date, then the closing price of a Share as
                           quoted on such Composite Tape on the next preceding
                           date on which there was trading in the Shares;

                  (b)      if the Common Stock is not listed or admitted to
                           trade on a national securities exchange, the
                           last/closing price for a Share on such date, as
                           furnished by the National Association of Securities
                           Dealers, Inc. ("NASD") through the NASDAQ National
                           Market Reporting System or a similar organization if
                           the NASD is no longer reporting such information;

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                  (c)      if the Common Stock is not listed or admitted to
                           trade on a national securities exchange and is not
                           reported on the National Market Reporting System, the
                           mean between the bid and asked price for a Share on
                           such date, as furnished by the NASD or a similar
                           organization; or

                  (d)      if the Common Stock is not listed or admitted to
                           trade on a national securities exchange, is not
                           reported on the National Market Reporting System and
                           if bid and asked prices for the Common Stock are not
                           furnished by the NASD or a similar organization, the
                           value as established by the Committee at such time
                           for purposes of this Plan.

                  "GRANT DATE" means the first day of each Offering Period, as
                  determined by the Committee and announced to potential
                  Eligible Employees.

                  "OFFERING PERIOD" means the six-consecutive month period
                  commencing on each Grant Date; provided, however, that the
                  Committee may declare, as it deems appropriate and in advance
                  of the applicable Offering Period, a shorter (not to be less
                  than three months) Offering Period or a longer (not to exceed
                  27 months) Offering Period; provided further that the Grant
                  Date for an Offering Period may not occur on or before the
                  Exercise Date for the immediately preceding Offering Period.

                  "OPTION" means the stock option to acquire Shares granted to a
                  Participant pursuant to Section 8.

                  "OPTION PRICE" means the per share exercise price of an Option
                  as determined in accordance with Section 8(b).

                  "PARENT" means any corporation (other than the Corporation) in
                  an unbroken chain of corporations ending with the Corporation
                  in which each corporation (other than the Corporation) owns
                  stock possessing 50% or more of the total combined voting
                  power of all classes of stock in one or more of the other
                  corporations in the chain.

                  "PARTICIPANT" means an Eligible Employee who has elected to
                  participate in this Plan and who has filed a valid and
                  effective Subscription Agreement to make Contributions
                  pursuant to Section 6.

                  "PLAN" means this Versicor Inc. Employee Stock Purchase Plan,
                  as amended from time to time.

                  "RULE 16b-3" means Rule 16b-3 as promulgated by the Commission
                  under Section 16, as amended from time to time.

                  "SHARE" means a share of Common Stock.

                  "SUBSCRIPTION AGREEMENT" means the written agreement filed by
                  an Eligible Employee with the Corporation pursuant to Section
                  6 to participate in this Plan.

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                  "SUBSIDIARY" means any corporation (other than the
                  Corporation) in an unbroken chain of corporations (beginning
                  with the Corporation) in which each corporation (other than
                  the last corporation) owns stock possessing 50% or more of the
                  total combined voting power of all classes of stock in one or
                  more of the other corporations in the chain.

3.       ELIGIBILITY

         Any person employed as an Eligible Employee as of a Grant Date shall be
         eligible to participate in this Plan during the Offering Period in
         which such Grant Date occurs, subject to the Eligible Employee
         satisfying the requirements of Section 6.

4.       STOCK SUBJECT TO THIS PLAN; SHARE LIMITATIONS

         (a)      Subject to the provisions of Section 17, the capital stock
                  that may be delivered under this Plan will be shares of the
                  Corporation's authorized but unissued Common Stock and any of
                  its shares of Common Stock held as treasury shares. The
                  maximum number of Shares that may be delivered pursuant to
                  Options granted under this Plan is [___________] Shares,
                  subject to adjustments pursuant to Section 17.

                  In the event that all of the Shares made available under this
                  Plan are subscribed prior to the expiration of this Plan, this
                  Plan shall terminate at the end of that Offering Period and
                  the Shares available shall be allocated for purchase by
                  Participants in that Offering Period on a pro-rata basis
                  determined with respect to Participants' Account balances.

         (b)      The maximum number of Shares that any one individual may
                  acquire upon exercise of his or her Option with respect to any
                  one Offering Period is 3,000, subject to adjustments pursuant
                  to Section 17 (the "INDIVIDUAL LIMIT"); provided, however,
                  that the Committee may amend such Individual Limit, effective
                  no earlier than the first Offering Period commencing after the
                  adoption of such amendment, without stockholder approval. The
                  Individual Limit shall be proportionately adjusted for any
                  Offering Period of less than twelve months, and may, at the
                  discretion of the Committee, be proportionately increased for
                  any Offering Period of greater than twelve months.

5.       OFFERING PERIODS

         During the term of this Plan, the Corporation will offer Options to
         purchase Shares in each Offering Period to all Participants in that
         Offering Period. Unless otherwise specified by the Committee in advance
         of the Offering Period, an Offering Period that commences on or about
         July 1 will end the following December 31 and an Offering Period that
         commences on or about January 1 will end the following June 30. Each
         Option shall become effective on the Grant Date. The term of each
         Option shall be the duration of the related Offering Period and shall
         end on the Exercise Date. The first Offering Period shall commence no
         earlier than the Effective Date. Offering Periods

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         shall continue until this Plan is terminated in accordance with
         Section 18 or 19, or, if earlier, until no Shares remain available for
         Options pursuant to Section 4.

6.       PARTICIPATION

         (a)      An Eligible Employee may become a participant in this Plan by
                  completing a Subscription Agreement on a form approved by and
                  in a manner prescribed by the Committee (or its delegate). To
                  become effective, a Subscription Agreement must be signed by
                  the Eligible Person and filed with the Corporation at the time
                  specified by the Committee, but in all cases prior to the
                  start of the Offering Period with respect to which it is to
                  become effective, and must set forth a whole percentage (or,
                  if the Committee so provides, a stated amount) of the Eligible
                  Employee's Compensation to be credited to the Participant's
                  Account as Contributions each pay period.

         (b)      Notwithstanding the foregoing, a Participant's Contribution
                  election shall be subject to the following limitations:

                           (i)   the $25,000 annual limitation set forth in
                  Section 8(c);

                           (ii)  unless the Committee otherwise provides, an
                  election of a stated amount of Compensation must result in a
                  Plan Contribution of at least $10.00 each pay period;

                           (iii) a Participant may not elect to contribute more
                  than fifteen percent (15%) of his or her Compensation as Plan
                  Contributions; and

                           (iv)  such other limits, rules, or procedures as the
                  Committee may prescribe.

         (c)      Subscription Agreements shall contain the Eligible Employee's
                  authorization and consent to the Corporation's withholding
                  from his or her Compensation the amount of his or her
                  Contributions. An Eligible Employee's Subscription Agreement,
                  and his or her participation election and withholding consent
                  thereon, shall remain valid for all Offering Periods until (i)
                  the Eligible Employee's participation terminates pursuant to
                  the terms hereof, (ii) the Eligible Employee files a new
                  Subscription Agreement that becomes effective, or (iii) the
                  Committee requires that a new Subscription Agreement be
                  executed and filed with the Corporation.

7.       METHOD OF PAYMENT OF CONTRIBUTIONS

         (a)      The Corporation shall maintain on its books, or cause to be
                  maintained by a recordkeeper, an Account in the name of each
                  Participant. The percentage of Compensation elected to be
                  applied as Contributions by a Participant shall be deducted
                  from such Participant's Compensation on each payday during the
                  period for payroll deductions set forth below and such payroll
                  deductions shall be credited to that Participant's Account as
                  soon as administratively practicable after

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                  such date. A Participant may not make any additional
                  payments to his or her Account. A Participant's Account
                  shall be reduced by any amounts used to pay the Option Price
                  of Shares acquired, or by any other amounts distributed
                  pursuant to the terms hereof.

         (b)      Payroll deductions with respect to an Offering Period shall
                  commence as of the first day of the payroll period which
                  coincides with or immediately follows the applicable Grant
                  Date and shall end on the last day of the payroll period which
                  coincides with or immediately precedes the applicable Exercise
                  Date, unless sooner terminated by the Participant as provided
                  in this Section 7 or until his or her participation terminates
                  pursuant to Section 11.

         (c)      A Participant may terminate his or her Contributions during an
                  Offering Period (and receive a distribution of the balance of
                  his or her Account in accordance with Section 11) by
                  completing and filing with the Corporation, in such form and
                  on such terms as the Committee (or its delegate) may
                  prescribe, a written withdrawal form which shall be signed by
                  the Participant. Such termination shall be effective as soon
                  as administratively practicable after its receipt by the
                  Corporation. A withdrawal election pursuant to this Section
                  7(c) with respect to an Offering Period shall only be
                  effective, however, if it is received by the Corporation prior
                  to the Exercise Date of that Offering Period. Partial
                  withdrawals of Accounts, and other modifications or
                  suspensions of Subscription Agreements, except as provided in
                  Section 7(e) or 7(f), are not permitted.

         (d)      During leaves of absence approved by the Corporation and
                  meeting the requirements of Regulation Section 1.421-7(h)(2)
                  under the Code, a Participant may continue participation in
                  this Plan by cash payments to the Corporation on his normal
                  paydays equal to the reduction in his Plan Contributions
                  caused by his leave.

         (e)      A Participant may discontinue, increase, or decrease the level
                  of his or her Contributions (within Plan limits) by completing
                  and filing with the Corporation, on such terms as the
                  Committee (or its delegate) may prescribe, a new Subscription
                  Agreement which indicates such election. An election pursuant
                  to this Section 7(e) shall be effective no earlier than the
                  first Offering Period that commences after the Corporation's
                  receipt of such election.

         (f)      A Participant may discontinue (but not increase or otherwise
                  decrease) the level of his or her Contributions, by filing
                  with the Corporation, on such terms as the Committee (or its
                  delegate) may prescribe, a new Subscription Agreement which
                  indicates such election. A Participant may make only one
                  election under this Section 7(f) each Offering Period. An
                  election pursuant to this Section 7(f) shall be effective no
                  earlier than the first payroll period that starts after the
                  Corporation's receipt of such election.

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8.       GRANT OF OPTION

         (a)      On each Grant Date, each Eligible Employee who is a
                  participant during that Offering Period shall be granted an
                  Option to purchase a number of Shares. The Option shall be
                  exercised on the Exercise Date. The number of Shares subject
                  to the Option shall be determined by dividing the
                  Participant's Account balance as of the applicable Exercise
                  Date by the Option Price.

         (b)      The Option Price per Share of the Shares subject to an Option
                  for an Offering Period shall be the lesser of: (i) 85% of the
                  Fair Market Value of a Share on the applicable Grant Date; or
                  (ii) 85% of the Fair Market Value of a Share on the applicable
                  Exercise Date.

         (c)      Notwithstanding anything else contained herein, a person who
                  is otherwise an Eligible Employee shall not be granted any
                  Option (or any Option granted shall be subject to compliance
                  with the following limitations) or other right to purchase
                  Shares under this Plan to the extent:

                           (i) it would, if exercised, cause the person to own
                  "stock" (as such term is defined for purposes of Section
                  423(b)(3) of the Code) possessing 5% or more of the total
                  combined voting power or value of all classes of stock of the
                  Corporation, or of any Parent, or of any Subsidiary; or

                           (ii) such Option causes such individual to have
                  rights to purchase stock under this Plan and any other plan of
                  the Corporation, any Parent, or any Subsidiary which is
                  qualified under Section 423 of the Code which accrue at a rate
                  which exceeds $25,000 of the fair market value of the stock of
                  the Corporation, of any Parent, or of any Subsidiary
                  (determined at the time the right to purchase such Stock is
                  granted, before giving effect to any discounted purchase price
                  under any such plan) for each calendar year in which such
                  right is outstanding at any time.

                  For purposes of the foregoing, a right to purchase stock
                  accrues when it first become exercisable during the calendar
                  year. In determining whether the stock ownership of an
                  Eligible Employee equals or exceeds the 5% limit set forth
                  above, the rules of Section 424(d) of the Code (relating to
                  attribution of stock ownership) shall apply, and stock which
                  the Eligible Employee may purchase under outstanding options
                  shall be treated as stock owned by the Eligible Employee.

9.       EXERCISE OF OPTION

         Unless a Participant's Plan participation is terminated as provided in
         Section 11, his or her Option for the purchase of Shares shall be
         exercised automatically on the Exercise Date for that Offering Period,
         without any further action on the Participant's part, and the maximum
         number of whole Shares subject to such Option (subject to the
         Individual

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         Limit set forth in Section 4(b) and the limitations contained in
         Section 8(c)) shall be purchased at the Option Price with the balance
         of such Participant's Account.

         If any amount which is not sufficient to purchase a whole Share remains
         in a Participant's Account after the exercise of his or her Option on
         the Exercise Date: (i) such amount shall be credited to such
         Participant's Account for the next Offering Period, if he or she is
         then a Participant; or (ii) if such Participant is not a Participant in
         the next Offering Period, or if the Committee so elects, such amount
         shall be refunded to such Participant as soon as administratively
         practicable after such date. If the Share limit of Section 4(a) is
         reached, any amount that remains in a Participant's Account after the
         exercise of his or her Option on the Exercise Date to purchase the
         number of Shares that he or she is allocated shall be refunded to the
         Participant as soon as administratively practicable after such date.

         If any amount which exceeds the Individual Limit set forth in Section
         4(b) or one of the limitations set forth in Section 8(c) remains in a
         Participant's Account after the exercise of his or her Option on the
         Exercise Date, such amount shall be refunded to the Participant as soon
         as administratively practicable after such date.

10.      DELIVERY

         As soon as administratively practicable after the Exercise Date, the
         Corporation shall deliver to each Participant a certificate
         representing the Shares purchased upon exercise of his or her Option.
         The Corporation may make available an alternative arrangement for
         delivery of Shares to a recordkeeping service. The Committee (or its
         delegate), in its discretion, may either require or permit the
         Participant to elect that such certificates be delivered to such
         recordkeeping service. In the event the Corporation is required to
         obtain from any commission or agency authority to issue any such
         certificate, the Corporation will seek to obtain such authority. If the
         Corporation is unable to obtain from any such commission or agency
         authority which counsel for the Corporation deems necessary for the
         lawful issuance of any such certificate, or if for any other reason the
         Corporation can not issue or deliver Shares and satisfy Section 21, the
         Corporation shall be relieved from liability to any Participant except
         that the Corporation shall return to each Participant the amount of the
         balance in his or her Account.

11.      TERMINATION OF EMPLOYMENT; CHANGE IN ELIGIBLE STATUS

         (a)      Except as provided in the next paragraph, if a Participant
                  ceases to be an Eligible Employee for any reason, or if the
                  Participant elects to terminate Contributions pursuant to
                  Section 7(c), at any time prior to the last day of an Offering
                  Period in which he or she participates, such Participant's
                  Account shall be paid to him or her or in cash (or, in the
                  event of the Participant's death, to the person or persons
                  entitled thereto under Section 13 in cash), and such
                  Participant's Option and participation in the Plan shall be
                  automatically terminated.

                  If a Participant (i) ceases to be an Eligible Employee during
                  an Offering Period but remains an employee of the Company
                  through the Exercise Date, or (ii)

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                  during an Offering Period commences a sick leave, military
                  leave, or other leave of absence approved by the Company,
                  and the leave meets the requirements of Treasury Regulation
                  Section 1.421-7(h)(2) and the Participant is an employee of
                  the Company or on such leave as of the applicable Exercise
                  Date, such Participant's Contributions shall cease (subject
                  to Section 7(d)), and the Contributions previously credited
                  to the Participant's Account for that Offering Period shall
                  be used to exercise the Participant's Option as of the
                  applicable Exercise Date in accordance with Section 9
                  (unless the Participant makes an election to terminate
                  Contributions in accordance with Section 7(c) at any time
                  prior to the last day of the applicable Offering Period, in
                  which case such Participant's Account shall be paid to him
                  or her in cash in accordance with the foregoing paragraph).

         (b)      A Participant's termination from Plan participation precludes
                  the Participant from again participating in this Plan during
                  that Offering Period. However, such termination shall not have
                  any effect upon his or her ability to participate in any
                  succeeding Offering Period, provided that the applicable
                  eligibility and participation requirements are again then met.
                  A Participant's termination from Plan participation shall be
                  deemed to be a revocation of that Participant's Subscription
                  Agreement and such Participant must file a new Subscription
                  Agreement to resume Plan participation in any succeeding
                  Offering Period.

         (c)      For purposes of this Plan, if a Participating Subsidiary
                  ceases to be a Subsidiary, each person employed by that
                  Subsidiary will be deemed to have terminated employment for
                  purposes of this Plan and will no longer be an Eligible
                  Employee, unless the person continues as an Eligible Employee
                  in respect of another Company entity.

12.      ADMINISTRATION

         (a)      The Board shall appoint the Committee, which shall be composed
                  of not less than two members of the Board. Each member of the
                  Committee, in respect of any transaction at a time when an
                  affected Participant may be subject to Section 16 of the
                  Exchange Act, shall be a "non-employee director" within the
                  meaning of Rule 16b-3. The Board may, at any time, increase or
                  decrease the number of members of the Committee, may remove
                  from membership on the Committee all or any portion of its
                  members, and may appoint such person or persons as it desires
                  to fill any vacancy existing on the Committee, whether caused
                  by removal, resignation, or otherwise. The Board may also, at
                  any time, assume or change the administration of this Plan.

         (b)      The Committee shall supervise and administer this Plan and
                  shall have full power and discretion to adopt, amend and
                  rescind any rules deemed desirable and appropriate for the
                  administration of this Plan and not inconsistent with the
                  terms of this Plan, and to make all other determinations
                  necessary or advisable for the administration of this Plan.
                  The Committee shall act by majority vote or by unanimous
                  written consent. No member of the Committee shall be entitled
                  to act

                                      9
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                  on or decide any matter relating solely to himself or herself
                  or solely to any of his or her rights or benefits under this
                  Plan. The Committee shall have full power and discretionary
                  authority to construe and interpret the terms and conditions
                  of this Plan, which construction or interpretation shall be
                  final and binding on all parties including the Company,
                  Participants and beneficiaries. The Committee may delegate
                  ministerial non-discretionary functions to third parties,
                  including individuals who are officers or employees of the
                  Corporation.

         (c)      Subject only to compliance with the express provisions hereof,
                  the Board and Committee may act in their absolute discretion
                  in matters within their authority related to this Plan. Any
                  action taken by, or inaction of, the Corporation, any
                  Participating Subsidiary, the Board or the Committee relating
                  or pursuant to this Plan shall be within the absolute
                  discretion of that entity or body and will be conclusive and
                  binding upon all persons. In making any determination or in
                  taking or not taking any action under this Plan, the Board or
                  Committee, as the case may be, may obtain and may rely on the
                  advice of experts, including professional advisors to the
                  Corporation. No member of the Board or Committee, or officer
                  or agent of the Company, will be liable for any action,
                  omission or decision under the Plan taken, made or omitted in
                  good faith.

13.      DESIGNATION OF BENEFICIARY

         (a)      A Participant may file, on a form and in a manner prescribed
                  by the Committee (or its delegate), a written designation of a
                  beneficiary who is to receive any Shares or cash from such
                  Participant's Account under this Plan in the event of such
                  Participant's death. If a Participant's death occurs
                  subsequent to the end of an Offering Period but prior to the
                  delivery to him or her of any Shares deliverable under the
                  terms of this Plan, such Shares and any remaining balance of
                  such Participant's Account shall be paid to such beneficiary
                  (or such other person as set forth in Section 13(b)) as soon
                  as administratively practicable after the Corporation receives
                  notice of such Participant's death and any outstanding
                  unexercised Option shall terminate. If a Participant's death
                  occurs at any other time, the balance of such Participant's
                  Account shall be paid to such beneficiary (or such other
                  person as set forth in Section 13(b)) in cash as soon as
                  administratively practicable after the Corporation receives
                  notice of such Participant's death and such Participant's
                  Option shall terminate. If a Participant is married and the
                  designated beneficiary is not his or her spouse, spousal
                  consent shall be required for such designation to be effective
                  unless it is established (to the satisfaction of the Committee
                  or its delegate) that there is no spouse or that the spouse
                  cannot be located. The Committee may rely on the last
                  designation of a beneficiary filed by a Participant in
                  accordance with this Plan.

         (b)      Beneficiary designations may be changed by the Participant
                  (and his or her spouse, if required) at any time on forms
                  provided and in the manner prescribed by the Committee (or its
                  delegate). If a Participant dies with no validly designated
                  beneficiary under this Plan who is living at the time of such
                  Participant's death, the Corporation shall deliver all Shares
                  and/or cash payable

                                      10
<PAGE>

                  pursuant to the terms hereof to the executor or administrator
                  of the estate of the Participant, or if no such executor or
                  administrator has been appointed, the Corporation, in its
                  discretion, may deliver such Shares and/or cash to the spouse
                  or to any one or more dependents or relatives of the
                  Participant, or if no spouse, dependent or relative is known
                  to the Corporation, then to such other person as the
                  Corporation may designate.

14.      TRANSFERABILITY

         Neither Contributions credited to a Participant's Account nor any
         Options or rights with respect to the exercise of Options or right to
         receive Shares under this Plan may be anticipated, alienated,
         encumbered, assigned, transferred, pledged or otherwise disposed of in
         any way (other than by will, the laws of descent and distribution, or
         as provided in Section 13) by the Participant. Any such attempt at
         anticipation, alienation, encumbrance, assignment, transfer, pledge or
         other disposition shall be without effect and all amounts shall be paid
         and all Shares shall be delivered in accordance with the provisions of
         this Plan. Amounts payable or Shares deliverable pursuant to this Plan
         shall be paid or delivered only to the Participant or, in the event of
         the Participant's death, to the Participant's beneficiary pursuant to
         Section 13.

15.      USE OF FUNDS; INTEREST

         All Contributions received or held by the Corporation under this Plan
         will be included in the general assets of the Corporation and may be
         used for any corporate purpose. Notwithstanding anything else contained
         herein to the contrary, no interest will be paid to any Participant or
         credited to his or her Account under this Plan (in respect of Account
         balances, refunds of Account balances, or otherwise).

16.      REPORTS

         Statements shall be provided to Participants as soon as
         administratively practicable following each Exercise Date. Each
         Participant's statement shall set forth, as of such Exercise Date, that
         Participant's Account balance immediately prior to the exercise of his
         or her Option, the Option Price, the number of whole Shares purchased
         and his or her remaining Account balance, if any.

17.      ADJUSTMENTS OF AND CHANGES IN THE STOCK

         Upon or in contemplation of any reclassification, recapitalization,
         stock split (including a stock split in the form of a stock dividend),
         or reverse stock split; any merger, combination, consolidation, or
         other reorganization; split-up, spin-off, or any similar extraordinary
         dividend distribution in respect of the Common Stock (whether in the
         form of securities or property); any exchange of Common Stock or other
         securities of the Corporation, or any similar, unusual or extraordinary
         corporate transaction in respect of the Common Stock; or a sale of
         substantially all the assets of the Corporation as an entirety occurs;
         then the Committee shall, in such manner, to such extent (if any) and
         at such time as it deems appropriate and equitable in the
         circumstances:

                                      11
<PAGE>

         (a)      proportionately adjust any or all of (i) the number and type
                  of Shares or the number and type of other securities that
                  thereafter may be made the subject of Options (including the
                  specific maxima and numbers of Shares set forth elsewhere in
                  this Plan), (ii) the number, amount and type of Shares (or
                  other securities or property) subject to any or all
                  outstanding Options, (iii) the Option Price of any or all
                  outstanding Options, or (iv) the securities, cash or other
                  property deliverable upon exercise of any outstanding Options;
                  or

         (b)      make provision for a cash payment or for the substitution or
                  exchange of any or all outstanding Options or the cash,
                  securities or property deliverable to the holder of any or all
                  outstanding Options based upon the distribution or
                  consideration payable to holders of the Common Stock upon or
                  in respect of such event.

         The Committee may adopt such valuation methodologies for outstanding
         Options as it deems reasonable in the event of a cash or property
         settlement and, without limitation on other methodologies, may base
         such settlement solely upon the excess (if any) of the amount payable
         upon or in respect of such event over the exercise or strike price of
         the Option.

         In each case, no adjustment, substitution, exchange or settlement will
         be made that would cause this Plan to violate Section 423 of the Code
         or any successor provisions without the written consent of the holders
         materially adversely affected thereby.

         In any of such events, the Committee may take such action sufficiently
         prior to such event to the extent that the Committee deems the action
         necessary to permit the Participant to realize the benefits intended to
         be conveyed with respect to the underlying shares in the same manner as
         is or will be available to stockholders generally.

18.      POSSIBLE EARLY TERMINATION OF PLAN AND OPTIONS

         Upon a dissolution of the Corporation, or any other event described in
         Section 17 that the Corporation does not survive, the Plan and, if
         prior to the last day of an Offering Period, any outstanding Option
         granted with respect to that Offering Period shall terminate, subject
         to any provision that has been expressly made by the Board for the
         survival, substitution, assumption, exchange or other settlement of the
         Plan and Options. In the event a Participant's Option is terminated
         pursuant to this Section 18 without a provision having been made by the
         Board for a substitution, exchange or other settlement of the Option,
         such Participant's Account shall be paid to him or her in cash without
         interest.

19.      TERM OF PLAN; AMENDMENT OR TERMINATION

         (a)      This Plan shall become effective as of the Effective Date. No
                  new Offering Periods shall commence on or after the day before
                  the tenth anniversary of the Effective Date and this Plan
                  shall terminate as of the Exercise Date on or immediately
                  following such date unless sooner terminated pursuant to
                  Section 4, Section 18, or this Section 19.

                                      12
<PAGE>

         (b)      The Board may, at any time, terminate or, from time to time,
                  amend, modify or suspend this Plan, in whole or in part,
                  without notice. Stockholder approval for any amendment or
                  modification shall not be required, except to the extent
                  required by Section 423 of the Code or other applicable law,
                  or deemed necessary or advisable by the Board. No Options may
                  be granted during any suspension of this Plan or after the
                  termination of this Plan, but the Committee will retain
                  jurisdiction as to Options then outstanding in accordance with
                  the terms of this Plan. No amendment, modification, or
                  termination pursuant to this Section 19(b) shall, without
                  written consent of the Participant, affect in any manner
                  materially adverse to the Participant any rights or benefits
                  of such Participant or obligations of the Corporation under
                  any Option granted under this Plan prior to the effective date
                  of such change. Changes contemplated by Section 17 or Section
                  18 shall not be deemed to constitute changes or amendments
                  requiring Participant consent. Notwithstanding the foregoing,
                  the Committee shall have the right to designate from time to
                  time the Subsidiaries whose employees may be eligible to
                  participate in this Plan and such designation shall not
                  constitute any amendment to this Plan requiring stockholder
                  approval.

20.      NOTICES

         All notices or other communications by a Participant to the Corporation
         contemplated by this Plan shall be deemed to have been duly given when
         received in the form and manner specified by the Committee (or its
         delegate) at the location, or by the person, designated by the
         Committee (or its delegate) for that purpose.

21.      CONDITIONS UPON ISSUANCE OF SHARES

         This Plan, the granting of Options under this Plan and the offer,
         issuance and delivery of Shares are subject to compliance with all
         applicable federal and state laws, rules and regulations (including but
         not limited to state and federal securities laws) and to such approvals
         by any listing, regulatory or governmental authority as may, in the
         opinion of counsel for the Corporation, be necessary or advisable in
         connection therewith. The person acquiring any securities under this
         Plan will, if requested by the Corporation and as a condition precedent
         to the exercise of his or her Option, provide such assurances and
         representations to the Corporation as the Committee may deem necessary
         or desirable to assure compliance with all applicable legal and
         accounting requirements.

22.      PLAN CONSTRUCTION

         (a)      It is the intent of the Corporation that transactions
                  involving Options under this Plan in the case of Participants
                  who are or may be subject to the prohibitions of Section 16 of
                  the Exchange Act satisfy the requirements for applicable
                  exemptions under Rule 16 promulgated by the Commission under
                  Section 16 of the Exchange Act so that such persons (unless
                  they otherwise agree) will be entitled to the exemptive relief
                  of Rule 16b-3 or other exemptive rules under Section 16 of the
                  Exchange Act in respect of those transactions and will not be
                  subject to avoidable liability thereunder.

                                      13
<PAGE>

         (b)      This Plan and Options are intended to qualify under Section
                  423 of the Code.

         (c)      If any provision of this Plan or of any Option would otherwise
                  frustrate or conflict with the intents expressed above, that
                  provision to the extent possible shall be interpreted so as to
                  avoid such conflict. If the conflict remains irreconcilable,
                  the Committee may disregard the provision if it concludes that
                  to do so furthers the interest of the Corporation and is
                  consistent with the purposes of this Plan as to such persons
                  in the circumstances.

23.      EMPLOYEES' RIGHTS

         (a)      Nothing in this Plan (or in any other documents related to
                  this Plan) will confer upon any Eligible Employee or
                  Participant any right to continue in the employ or other
                  service of the Company, constitute any contract or agreement
                  of employment or other service or effect an employee's status
                  as an employee at will, nor shall interfere in any way with
                  the right of the Company to change such person's compensation
                  or other benefits or to terminate his or her employment or
                  other service with or without cause. Nothing contained in this
                  Section 23(a), however, is intended to adversely affect any
                  express independent right of any such person under a separate
                  employment or service contract other than a Subscription
                  Agreement.

         (b)      No Participant or other person will have any right, title or
                  interest in any fund or in any specific asset (including
                  Shares) of the Company by reason of any Option hereunder.
                  Neither the provisions of this Plan (or of any related
                  documents), nor the creation or adoption of this Plan, nor any
                  action taken pursuant to the provisions of this Plan will
                  create, or be construed to create, a trust of any kind or a
                  fiduciary relationship between the Company and any Participant
                  or other person. To the extent that a Participant or other
                  person acquires a right to receive payment pursuant to this
                  Plan, such right will be no greater than the right of any
                  unsecured general creditor of the Corporation. No special or
                  separate reserve, fund or deposit will be made to assure any
                  such payment.

         (c)      A Participant will not be entitled to any privilege of stock
                  ownership as to any Shares not actually delivered to and held
                  of record by the Participant. No adjustment will be made for
                  dividends or other rights as a stockholder for which a record
                  date is prior to such date of delivery.

24.      MISCELLANEOUS

         (a)      This Plan, the Options, and related documents shall be
                  governed by, and construed in accordance with, the laws of the
                  State of Delaware. If any provision shall be held by a court
                  of competent jurisdiction to be invalid and unenforceable, the
                  remaining provisions of this Plan shall continue in effect.

         (b)      Captions and headings are given to the sections of this Plan
                  solely as a convenience to facilitate reference. Such captions
                  and headings shall not be

                                      14
<PAGE>

                  deemed in any way material or relevant to the construction of
                  interpretation of this Plan or any provision hereof.

         (c)      The adoption of this Plan shall not affect any other Company
                  compensation or incentive plans in effect. Nothing in this
                  Plan will limit or be deemed to limit the authority of the
                  Board or Committee (i) to establish any other forms of
                  incentives or compensation for employees of the Company (with
                  or without reference to the Common Stock), or (ii) to grant or
                  assume options (outside the scope of and in addition to those
                  contemplated by this Plan) in connection with any proper
                  corporate purpose; to the extent consistent with any other
                  plan or authority.

         (d)      Benefits received by a Participant under an Option granted
                  pursuant to this Plan shall not be deemed a part of the
                  Participant's compensation for purposes of the determination
                  of benefits under any other employee welfare or benefit plans
                  or arrangements, if any, provided by the Company, except where
                  the Committee or the Board expressly otherwise provides or
                  authorizes in writing.

25.      EFFECTIVE DATE

         Notwithstanding anything else contained herein to the contrary, the
         effectiveness of this Plan is subject to the approval of this Plan by
         the stockholders of the Corporation within twelve months after the
         Effective Date. Notwithstanding anything else contained herein to the
         contrary, no Shares shall be issued or delivered under this Plan until
         such stockholder approval is obtained and, if such stockholder approval
         is not obtained within such twelve-month period of time, all
         Contributions credited to a Participant's Account hereunder shall be
         refunded to such Participant (without interest) as soon as practicable
         after the end of such twelve-month period.

26.      TAX WITHHOLDING

         Notwithstanding anything else contained in this Plan herein to the
         contrary, the Company may deduct from a Participant's Account balance
         as of an Exercise Date, before the exercise of the Participant's Option
         is given effect on such date, the amount of any taxes which the Company
         reasonably determines it may be required to withhold with respect to
         such exercise. In such event, the maximum number of whole Shares
         subject to such Option (subject to the other limits set forth in this
         Plan) shall be purchased at the Option Price with the balance of the
         Participant's Account (after reduction for the tax withholding amount).

         Should the Company for any reason be unable, or elect not to, satisfy
         its tax withholding obligations in the manner described in the
         preceding paragraph with respect to a Participant's exercise of an
         Option, or should the Company reasonably determine that it has a tax
         withholding obligation with respect to a disposition of Shares acquired
         pursuant to the exercise of an Option prior to satisfaction of the
         holding period requirements of Section 423 of the Code, the Company
         shall have the right at its option to (i) require the Participant to
         pay or provide for payment of the amount of any taxes which the Company
         reasonably determines that it is required to withhold with respect to
         such event or (ii)

                                      15
<PAGE>

         deduct from any amount otherwise payable to or for the account of the
         Participant the amount of any taxes which the Company reasonably
         determines that it is required to withhold with respect to such event.

27.      NOTICE OF SALE

         Any person who has acquired Shares under this Plan shall give prompt
         written notice to the Corporation of any sale or other transfer of the
         Shares if such sale or transfer occurs (i) within the two-year period
         after the Grant Date of the Offering Period with respect to which such
         Shares were acquired, or (ii) within the twelve-month period after the
         Exercise Date of the Offering Period with respect to which such Shares
         were acquired.

                  IN WITNESS WHEREOF, the Corporation has caused its duly
authorized officer to execute this Plan on this ___ day of _________, 2000.

                                        VERSICOR INC.

                                        By:_____________________________________

                                        Its:____________________________________


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