VION PHARMACEUTICALS INC
S-8, 1997-11-04
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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    As filed with the Securities and Exchange Commission on November 4, 1997
                                                       Registration No. 33-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                 _______________


                           VION PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)

       DELAWARE                                                  13-3671221
       (State or other juris-                                  (I.R.S. Employer
       diction of incorporation                                Identification
       or organization)                                        Number)


                                 4 SCIENCE PARK
                          NEW HAVEN, CONNECTICUT 06511
                                 (203) 498-4210
(Address,  including zip code,  and telephone  number,  including  area code, of
registrant's principal executive offices)

                           VION PHARMACEUTICALS, INC.
                   AMENDED AND RESTATED 1993 STOCK OPTION PLAN
                            (full title of the plan)
                                 ______________

                                   JOHN SPEARS
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                           VION PHARMACEUTICALS, INC.
                                 4 SCIENCE PARK
                          NEW HAVEN, CONNECTICUT 06511
                                 (203) 498-4210

(Name, address,  including zip code, and telephone number,  including area code,
of agent for service)

                                 ______________


Copies of all communications, including all communications sent to the agent for
service, should be sent to:

                             D. TERENCE JONES, ESQ.
                                  WIGGIN & DANA
                                ONE CENTURY TOWER
                          NEW HAVEN, CONNECTICUT 06508
                                 (203) 498-4400
                                _______________

<TABLE>
<CAPTION>
                                                   CALCULATION OF REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                       <C>                        <C>                       <C>
                                                              Proposed Maximum           Proposed Maximum          Amount of
Title of Securities to be           Amount to be              Offering Price Per         Aggregate Offering        Registration Fee
Registered                          Registered                Share(1)                   Price(1)
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock $.01 par value
per share...........                500,000 shares (2)        $5.57                      $2,785,000.00             $843.94
====================================================================================================================================
</TABLE>

(1)   The  price  is  estimated  solely  for  the  purpose  of  calculating  the
      registration  fee pursuant to Rule  457(h)(1).  The offering price and fee
      are computed based on the average of the high and low prices of the Common
      Stock as reported on the NASDAQ Small Cap Market on October 29, 1997.

(2)   Does not include  1,000,000  shares  previously  registered on October 27,
      1995 and October 22, 1996  pursuant  to a  seperate registration statement
      for which a fee was paid on such filing dates.

================================================================================







                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE

             The  following  documents,  which are on file  with the  Commission
(File No. 0-26534),  are incorporated in this Prospectus by reference and made a
part hereof:

         (a) The  Company's  Annual  Report on Form  10-KSB  for the year  ended
December 31, 1996.

         (b) The Company's  Quarterly  Report on Form 10-QSB for the three month
period ended March 31, 1997.

         (c) The Company's  Quarterly  Report on Form 10-QSB for the three month
period ended June 30, 1997.

         (d) The  description of the Company's  Common Stock contained in Item 1
of the Company's Registration Statement on Form 8-A filed July 31, 1995.

         All documents filed by the Company  pursuant to Sections 13(a),  13(c),
14 or 15(d) of the  Exchange  Act  subsequent  to the date of this  Registration
Statement and prior to the  termination  of this offering  shall be deemed to be
incorporated  by reference  into this  Registration  Statement  and to be a part
hereof from the  respective  dates of filing of such  documents.  Any  statement
contained in a document  incorporated  or deemed to be incorporated by reference
herein  shall be deemed to be modified  or  superseded  for all  purposes to the
extent that a statement  contained in this  Registration  Statement or any other
subsequently  filed  document  that is also  incorporated  by  reference  herein
modifies  or  supersedes  such  statement.  Any such  statements  so modified or
superseded  shall  not be  deemed,  except  as so  modified  or  superseded,  to
constitute a part of this Registration Statement.

ITEM 4.  DESCRIPTION OF SECURITIES

                  Not applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL

                  None.


                                      II-1









ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

                  The  Certificate of  Incorporation  and By-Laws of the Company
provide that the Company shall  indemnify,  to the full extent  permitted by the
Delaware General Corporation Law ("GCL") as set forth in Section 145 of the GCL.

                  In  accordance   with  Section   102(a)(7)  of  the  GCL,  the
Certificate of Incorporation of the Company eliminates the personal liability of
directors to the Company or its  stockholders for monetary damages for breach of
a fiduciary  duty as a director  with certain  limited  exceptions  set forth in
Section 102(a)(7).

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED

                  Not applicable.

ITEM 8.  EXHIBITS

Exhibit
No.               Description
- -------           -----------

4                 Vion Pharmaceuticals, Inc. Amended and Restated 1993 Stock 
                    Option Plan, as amended

5                 Opinion of Wiggin & Dana

23.1              Consent of Ernst & Young LLP

23.2              Consent of Wiggin & Dana (to be filed as part of Exhibit 5)

24                Power of Attorney (included on signature page)

ITEM 9.  UNDERTAKINGS

              (a)    The undersigned registrant will:

              (1)    File,  during  any  period  in  which  it  offers  or sells
                     securities, a post-effective amendment to this registration
                     statement to:

              (i)    Include any additional or changed  material  information on
                     the plan of distribution.

              (2)    For  determining  any liability  under the Securities  Act,
                     treat each  post-effective  amendment as a new registration
                     statement of the securities offered


                                      II-2








                     and the offering of the  securities  at that time to be the
                     initial bona fide offering.

              (3)    File a post-effective amendment to remove from registration
                     any of the securities  that remain unsold at the end of the
                     offering.


                                      II-3








                                   SIGNATURES

              Pursuant to the  requirements  of the  Securities  Act of 1933, as
amended, the registrant certifies that it has reasonable grounds to believe that
it meets all of the requirements for filing on Form S-8 and has duly caused this
registration statement to be signed on its behalf by the undersigned,  thereunto
duly authorized, in the City of New Haven, State of Connecticut,  on November 4,
1997.


                                       VION PHARMACEUTICALS, INC.


                                       By: /s/ John A. Spears
                                           ---------------------------
                                           John A. Spears
                                           President and Chief Executive Officer


                                POWER OF ATTORNEY

              KNOW ALL MEN BY THESE  PRESENTS,  that each person whose signature
appears  below  constitutes  and appoints John A. Spears and Thomas Klein as his
true and lawful attorneys-in-fact and agents, each acting alone, with full power
of substitution and resubstitution, for him and in his name, place and stead, in
any and all  capacities,  to sign  any or all  amendments  to this  Registration
Statement,  including post-effective  amendments, and to file the same, with all
exhibits thereto, and all documents in connection therewith, with the Securities
and Exchange Commission,  granting unto said  attorneys-in-fact  and agents, and
each of them,  full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises,  as fully to
all intents and purposes as he might or could do in person,  and hereby ratifies
and confirms all that said  attorneys-in-fact  and agents, each acting alone, or
their  substitute or substitutes,  may lawfully do or cause to be done by virtue
hereof.

              Pursuant to the  requirements  of the  Securities  Act of 1933, as
amended,  this  registration  statement  has been signed below by the  following
persons in the capacities and on the dates indicated.


Signature                     Title                                  Date
- ---------                     -----                                  ----


/s/ William R. Miller         Chairman of the Board          November 4, 1997
- --------------------------                                           ----
William R. Miller



/s/ John A. Spears            President, Chief Executive     November 4, 1997
- --------------------------    Officer and Director                   ----
John A. Spears                 



/s/ Alan C. Sartorelli        Director                       November 4, 1997
- --------------------------                                           ----
Alan C. Sartorelli, Ph.D.



                                      II-4







/s/ Michel C. Bergerac              Director               November 4, 1997
- -------------------------------                                    ----
Michel C. Bergerac



/s/ Frank T. Cary                   Director               November 4, 1997
- -------------------------------                                    ----
Frank T. Cary



/s/ A.E. Cohen                      Director               November 4, 1997
- -------------------------------                                    ----
A.E. Cohen



/s/ James L. Ferguson               Director               November 4, 1997
- -------------------------------                                    ----
James L. Ferguson



/s/ Michael C. Kent                 Director               November 4, 1997
- -------------------------------                                    ----
Michael C. Kent



/s/ E. Donald Shapiro               Director               November 4, 1997
- -------------------------------                                    ----
E. Donald Shapiro



/s/ Walter Wriston                  Director               November 4, 1997
- -------------------------------                                    ----
Walter Wriston





                                      II-5









/s/ Thomas E. Klein              Vice President - Finance,    November 4, 1997
- ----------------------------     Chief Financial Officer              ----
Thomas E. Klein                  and Treasurer (Principal
                                 Financial and Accounting
                                 Officer)                
                                 



                                      II-6





                                                                       EXHIBIT 4
                                                                       ---------


                           VION PHARMACEUTICALS, INC.

                              AMENDED AND RESTATED
                             1993 STOCK OPTION PLAN


1.       Purpose.
         -------

         The  purpose  of  this  plan  (the   "Plan")  is  to  secure  for  Vion
Pharmaceuticals,  Inc. (the  "Corporation")  and its  stockholders  the benefits
arising from capital stock  ownership by  employees,  officers and directors of,
and consultants or advisors to, the Corporation and its subsidiary  corporations
who are expected to contribute to the  Corporation's  future growth and success.
Except  where the  context  otherwise  requires,  the term  "Corporation"  shall
include all present and future  subsidiaries  of the  Corporation  as defined in
Sections  424(e) and 424(f) of the Internal  Revenue Code of 1986, as amended or
replaced from time to time (the "Code"). Those provisions of the Plan which make
express reference to Section 422 shall apply only to Incentive Stock Options (as
that term is defined in the Plan).


2.       Type of Options and Administration.
         ----------------------------------

         (a) Types of  Options.  Options  granted  pursuant to the Plan shall be
authorized  by  action  of the  Board  of  Directors  of the  Corporation  (or a
Committee  designated  by the Board of  Directors)  and may be either  incentive
stock options  ("Incentive  Stock Options")  meeting the requirements of Section
422 of the Code or  non-statutory  options  which are not  intended  to meet the
requirements of Section 422 of the Code.

         (b)  Administration.  The Plan  will be  administered  by the  Board of
Directors of the Corporation, whose construction and interpretation of the terms
and provisions of the Plan shall be final and conclusive. The Board of Directors
may in its sole discretion grant options to purchase shares of the Corporation's
Common Stock,  $.01 par value per share  ("Common  Stock") and issue shares upon
exercise  of such  options  as  provided  in the  Plan.  The  Board  shall  have
authority,  subject to the  express  provisions  of the Plan,  to  construe  the
respective option agreements and the Plan, to prescribe, amend and rescind rules
and  regulations  relating to the Plan, to determine the terms and provisions of
the respective option agreements,  which need not be identical,  and to make all
other  determinations  in the  judgment of the Board of  Directors  necessary or
desirable for the administration of the Plan. The Board of Directors may correct
any defect or supply any omission or reconcile any  inconsistency in the Plan or
in any option  agreement in the manner and to the extent it shall deem expedient
to carry the Plan into  effect and it shall be the sole and final  judge of such
expediency. No director or person acting








pursuant to authority  delegated  by the Board of Directors  shall be liable for
any  action or  determination  under the Plan made in good  faith.  The Board of
Directors  may, to the full extent  permitted by or consistent  with  applicable
laws or regulations  (including,  without  limitation,  applicable state law and
Rule 16b-3 promulgated under the Securities  Exchange Act of 1934 (the "Exchange
Act"), or any successor rule ("Rule 16b-3")),  delegate any or all of its powers
under  the Plan to a  committee  (the  "Committee")  appointed  by the  Board of
Directors,  and if the Committee is so appointed all  references to the Board of
Directors  in the Plan shall mean and relate to such  Committee  with respect to
the powers so delegated.

         (c)  Applicability  of Rule 16b-3.  Those  provisions of the Plan which
make express reference to Rule 16b-3 shall apply to the Corporation only at such
time as the  Corporation's  Common Stock is  registered  under the Exchange Act,
subject to the last sentence of Section  3(b),  and then only to such persons as
are  required  to file  reports  under  Section  16(a)  of the  Exchange  Act (a
"Reporting Person").


3.       Eligibility.
         -----------

         (a) General.  Options may be granted to persons who are, at the time of
grant,  employees,  officers or directors of, or consultants or advisors to, the
Corporation;  provided,  that  Incentive  Stock  Options  may only be granted to
individuals who are employees of the Corporation  (within the meaning of Section
3401(c) of the Code).  A person who has been granted an option may, if he or she
is otherwise  eligible,  be granted additional options if the Board of Directors
shall so determine.

         (b)  Grant  of  Options  to  Reporting  Persons.  From  and  after  the
registration of the Common Stock of the Corporation  under the Exchange Act, the
selection  of a director or an officer  who is a Reporting  Person (as the terms
"director"  and "officer" are defined for purposes of Rule 16b-3) as a recipient
of an option,  the timing of the option grant,  the exercise price of the option
and the number of shares subject to the option shall be determined either (i) by
the Board of Directors,  of which all members shall be  "disinterested  persons"
(as  hereinafter  defined),  or (ii) by a  committee  consisting  of two or more
directors  having full  authority to act in the matter,  each of whom shall be a
"disinterested person." For the purposes of the Plan, a director shall be deemed
to be a "disinterested person" only if such person qualifies as a "disinterested
person" within the meaning of Rule 16b-3, as such term is interpreted  from time
to time. If at least two of the members of the Board of Directors do not qualify
as a  "disinterested  person" within the meaning of Rule 16b-3,  as such term is
interpreted  from time to time,  then the  granting of options to  officers  and
directors who are Reporting Persons under the Plan shall not be determined in


                                      -2-







accordance with this Section 3(b) but shall be determined in accordance with the
other provisions of the Plan.

         (c) Directors' Options.  Directors of the Company who are not employees
or  beneficial  owners  of 5% or more of the  outstanding  Common  Stock  of the
Company  ("Eligible  Directors")  and who are elected to the Board of  Directors
subsequent to the date hereof will be granted an option  ("Director  Option") to
purchase  20,000  shares of Common  Stock on the date that such  person is first
elected or appointed a director (an "Initial  Director  Option").  Each Eligible
Director will receive an automatic  grant of a Director Option to purchase 5,000
shares of Common Stock on the day immediately  following the date of each annual
meeting of  stockholders  held  subsequent to December 31, 1995, as long as such
director is a member of the Board of Directors,  and provided that such director
did not receive an Initial  Director Option since the previous annual meeting of
stockholders.  The exercise  price for each share  subject to a Director  Option
shall  be  equal to the fair  market  value of the  Common  Stock on the date of
grant.   Director  Options  shall  become   exercisable  in  four  equal  annual
installments  commencing  one year from the date the option is granted  and will
expire  the  earlier  of 10 years  after the date of grant or 90 days  after the
termination of the director's  service on the Board. This Section 3(c) shall 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.


4.       Stock Subject to Plan.
         ---------------------

         The stock subject to options  granted under the Plan shall be shares of
authorized  but unissued or reacquired  Common  Stock.  Subject to adjustment as
provided in Section 15 below,  the maximum  number of shares of Common  Stock of
the Corporation which may be issued and sold under the Plan is 1,500,000 shares.
If an option granted under the Plan shall expire,  terminate or is cancelled for
any reason without having been exercised in full, the unpurchased shares subject
to such option shall again be available for  subsequent  option grants under the
Plan.


5.       Forms of Option Agreements.
         --------------------------

         As a condition to the grant of an option under the Plan, each recipient
of an option shall  execute an option  agreement  in such form not  inconsistent
with  the  Plan as may be  approved  by the  Board  of  Directors.  Such  option
agreements may differ among recipients.



                                       -3-







6.       Purchase Price.
         --------------

         (a) General. The purchase price per share of stock deliverable upon the
exercise of an option shall be  determined by the Board of Directors at the time
of grant of such  option;  provided,  however,  that in the case of an Incentive
Stock Option,  the exercise price shall not be less than 100% of the Fair Market
Value  (as  hereinafter  defined)  of such  stock,  at the time of grant of such
option,  or less  than  110% of such Fair  Market  Value in the case of  options
described in Section  11(b).  "Fair Market  Value" of a share of Common Stock of
the  Corporation  as of a specified date for the purposes of the Plan shall mean
the closing  price of a share of the Common  Stock on the  principal  securities
exchange on which such shares are traded on the day  immediately  preceding  the
date as of which Fair Market Value is being determined, or on the next preceding
date  on  which  such  shares  are  traded  if no  shares  were  traded  on such
immediately  preceding  day,  or if the shares  are not  traded on a  securities
exchange,  Fair  Market  Value shall be deemed to be the average of the high bid
and low asked  prices of the  shares in the  over-the-counter  market on the day
immediately preceding the date as of which Fair Market Value is being determined
or on the next  preceding  date on which such high bid and low asked prices were
recorded. If the shares are not publicly traded, Fair Market Value of a share of
Common  Stock  (including  in  the  case  of  any  repurchase  of  shares,   any
distributions  with respect thereto which would be repurchased  with the shares)
shall be determined  in good faith by the Board of  Directors.  In no case shall
Fair  Market  Value  be  determined  with  regard  to  restrictions  other  than
restrictions which, by their terms, will never lapse.

         (b)  Payment of  Purchase  Price.  Options  granted  under the Plan may
provide for the payment of the exercise  price by delivery of cash or a check to
the order of the  Corporation  in an amount equal to the exercise  price of such
options,  or, to the extent provided in the applicable option agreement,  (i) by
delivery to the Corporation of shares of Common Stock of the Corporation  having
a Fair  Market  Value on the date of  exercise  equal in amount to the  exercise
price of the  options  being  exercised,  (ii) by any  other  means  (including,
without limitation,  by delivery of a promissory note of the optionee payable on
such  terms as are  specified  by the  Board of  Directors)  which  the Board of
Directors  determines  are  consistent  with  the  purpose  of the Plan and with
applicable laws and regulations (including,  without limitation,  the provisions
of Rule 16b-3 and  Regulation T  promulgated  by the Federal  Reserve  Board) or
(iii) by any combination of such methods of payment.


7.       Option Period.
         -------------

         Subject to earlier termination as provided in the Plan, each option and
all rights  thereunder  shall expire on such date as  determined by the Board of
Directors and set forth in the


                                       -4-






applicable  option agreement,  provided,  that such date shall not be later than
(10) ten years after the date on which the option is granted.


8.       Exercise of Options.
         -------------------

         Each option granted under the Plan shall be exercisable  either in full
or in  installments at such time or times and during such period as shall be set
forth in the option agreement evidencing such option,  subject to the provisions
of the Plan.  No option  granted  to a  Reporting  Person  for  purposes  of the
Exchange Act,  however,  shall be exercisable  during the first six months after
the date of grant.  Subject to the  requirements  in the  immediately  preceding
sentence, if an option is not at the time of grant immediately exercisable,  the
Board of Directors may (i) in the agreement evidencing such option,  provide for
the  acceleration  of the exercise date or dates of the subject  option upon the
occurrence  of specified  events,  and/or (ii) at any time prior to the complete
termination of an option,  accelerate the exercise date or dates of such option.
All options granted under the Plan will become exercisable in no fewer than four
equal annual  installments  commencing not earlier than the first anniversary of
the date of grant.


9.       Nontransferability of Options.
         -----------------------------

         No option  granted  under this Plan shall be  assignable  or  otherwise
transferable  by the  optionee  except  by will or by the  laws of  descent  and
distribution or pursuant to a qualified  domestic  relations order as defined in
the Code or Title I of the Employee Retirement Income Security Act, or the rules
thereunder.  An option may be exercised during the lifetime of the optionee only
by the  optionee.  In the event an optionee  dies during his  employment  by the
corporation  or  any of its  subsidiaries,  or  during  the  three-month  period
following  the  date  of  termination  of  such  employment,  his  option  shall
thereafter  be  exercisable,  during the period  specified to the full extent to
which  such  option was  exercisable  by the  optionee  at the time of his death
during the periods set forth in Section 10 or 11(d).


10.      Effect of Termination of Employment or Other Relationship.
         ---------------------------------------------------------

         Except as provided in Section  11(d) with  respect to  Incentive  Stock
Options,  and subject to the provisions of the Plan, an optionee may exercise an
option at any time within  three (3) months  following  the  termination  of the
optionee's  employment or other  relationship with the Corporation or within one
(1) year if such termination was due to the death or disability of the optionee,
but,  except in the case of the  optionee's  death,  in no event  later than the
expiration date of the Option.  If the termination of the optionee's  employment
is for cause or is


                                       -5-






otherwise  attributable  to a  breach  by  the  optionee  of  an  employment  or
confidentiality or non-disclosure agreement, the option shall expire immediately
upon such termination.  The Board of Directors shall have the power to determine
what  constitutes  a  termination  for  cause or a breach  of an  employment  or
confidentiality  or  non-disclosure  agreement,  whether  an  optionee  has been
terminated for cause or has breached such an agreement,  and the date upon which
such termination for cause or breach occurs.  Any such  determinations  shall be
final and conclusive and binding upon the optionee.


11.      Incentive Stock Options.
         -----------------------

         Options granted under the Plan which are intended to be Incentive Stock
Options shall be subject to the following additional terms and conditions:

         (a) Express Designation.  All Incentive Stock Options granted under the
Plan shall,  at the time of grant,  be  specifically  designated  as such in the
option agreement covering such Incentive Stock Options.

         (b) 10% Stockholder.  If any employee to whom an Incentive Stock Option
is to be granted under the Plan is, at the time of the grant of such option, the
owner of stock  possessing  more than 10% of the total combined  voting power of
all  classes  of  stock  of the  Corporation  (after  taking  into  account  the
attribution of stock  ownership  rules of Section 424(d) of the Code),  then the
following  special  provisions shall be applicable to the Incentive Stock Option
granted to such individual:

                  (i) The purchase  price per share of the Common Stock  subject
         to such Incentive  Stock Option shall not be less than 110% of the Fair
         Market Value of one share of Common Stock at the time of grant; and

                  (ii) the option  exercise  period  shall not exceed five years
         from the date of grant.

         (c)  Dollar  Limitation.  For so long as the  Code  shall  so  provide,
options  granted to any employee under the Plan (and any other  incentive  stock
option  plans of the  Corporation)  which are intended to  constitute  Incentive
Stock Options shall not  constitute  Incentive  Stock Options to the extent that
such options, in the aggregate, become exercisable for the first time in any one
calendar year for shares of Common Stock with an aggregate Fair Market Value, as
of the respective date or dates of grant, of more than $100,000.

         (d) Termination of Employment,  Death or Disability. No Incentive Stock
Option may be exercised unless,  at the time of such exercise,  the optionee is,
and has been continuously since


                                       -6-






the date of grant of his or her option, employed by the
Corporation, except that:

                  (i) an  Incentive  Stock  Option may be  exercised  within the
         period  of three  months  after the date the  optionee  ceases to be an
         employee of the  Corporation  (or within  such lesser  period as may be
         specified  in the  applicable  option  agreement),  provided,  that the
         agreement  with respect to such option may designate a longer  exercise
         period and that the  exercise  after such  three-month  period shall be
         treated as the exercise of a non-statutory option under the Plan;

                  (ii)  if  the  optionee  dies  while  in  the  employ  of  the
         Corporation,  or within three  months  after the optionee  ceases to be
         such an employee,  the  Incentive  Stock Option may be exercised by the
         person to whom it is  transferred  by will or the laws of  descent  and
         distribution  within the period of one year after the date of death (or
         within such lesser period as may be specified in the applicable  option
         agreement); and

                  (iii) if the optionee  becomes disabled (within the meaning of
         Section 22(e)(3) of the Code or any successor provisions thereto) while
         in the employ of the  Corporation,  the  Incentive  Stock Option may be
         exercised  within the  period of one year  after the date the  optionee
         ceases to be such an  employee  because of such  disability  (or within
         such  lesser  period  as may be  specified  in  the  applicable  option
         agreement).

For all  purposes  of the Plan and any option  granted  hereunder,  "employment"
shall be defined in accordance with the provisions of Section  1.421-7(h) of the
Incoming Tax Regulations  (or any successor  regulations).  Notwithstanding  the
foregoing  provisions  to  Incentive  Stock  Option may be  exercised  after its
expiration date.


12.      Additional Provisions.
         ---------------------

         (a) Additional  Option  Provisions.  The Board of Directors may, in its
sole discretion,  include  additional  provisions in option agreements  covering
options granted under the Plan,  including  without  limitation  restrictions on
transfer,  repurchase rights,  rights of first refusal,  commitments to pay cash
bonuses, to make, arrange for or guaranty loans or to transfer other property to
optionees  upon  exercise  of  options,  or such  other  provisions  as shall be
determined by the Board of Directors;  provided, that such additional provisions
shall not be inconsistent  with any other term or condition of the Plan and such
additional  provisions  shall not cause any Incentive Stock Option granted under
the Plan to fail to qualify as an Incentive  Stock Option  within the meaning of
Section 422 of the Code.


                                       -7-






         (b)  Acceleration,  Extension,  Etc. The Board of Directors may, in its
sole discretion, (i) accelerate the date or dates on which all or any particular
option or options  granted  under the Plan may be  exercised  or (ii) extend the
dates during which all, or any  particular,  option or options granted under the
Plan may be  permitted if it would cause the Plan to fail to comply with Section
422 of the Code or with Rule 16b-3 (if applicable).


13.      General Restrictions.
         --------------------

         (a) Investment Representations.  The Corporation may require any person
to whom an option is granted,  as a condition of exercising such option, to give
written  assurances in substance and form satisfactory to the Corporation to the
effect that such person is acquiring  the Common Stock subject to the option for
his or her own account for  investment  and not with any  present  intention  of
selling or otherwise  distributing  the same,  and to such other  effects as the
Corporation  deems  necessary or appropriate in order to comply with federal and
applicable state securities laws, or with covenants or  representations  made by
the Corporation in connection with any public offering of its Common Stock.

         (b) Compliance with Securities Law. Each option shall be subject to the
requirement  that if, at any time,  counsel to the  Corporation  shall determine
that the listing,  registration or  qualification  of the shares subject to such
option upon any  securities  exchange or under any state or federal  law, or the
consent  or  approval  of any  governmental  or  regulatory  body,  or that  the
disclosure of non-public  information or the satisfaction of any other condition
is necessary as a condition of, or in  connection  with the issuance or purchase
of shares  thereunder,  such option may not be  exercised,  in whole or in part,
unless  such  listing,  registration,  qualification,  consent or  approval,  or
satisfaction  of  such  condition  shall  have  been  effected  or  obtained  on
conditions acceptable to the Board of Directors.  Nothing herein shall be deemed
to require the Corporation to apply for or to obtain such listing,  registration
or qualification, or to satisfy such condition.


14.      Rights as a Stockholder.
         -----------------------

         The  holder of an option  shall  have no rights as a  stockholder  with
respect to any shares covered by the option (including,  without limitation, any
rights to receive  dividends  or  non-cash  distributions  with  respect to such
shares)  until the date of issue of a stock  certificate  to him or her for such
shares.  No adjustment shall be made for dividends or other rights for which the
record date is prior to the date such stock certificate is issued.



                                       -8-






15.      Adjustment Provisions for Recapitalization, Reorganizations
         and Related Transactions.
         -----------------------------------------------------------

         (a)  Recapitalization  and Related  Transactions.  If,  through or as a
result of any recapitalization,  reclassification,  stock dividend, stock split,
reverse stock split or other similar transaction,  (i) the outstanding shares of
Common Stock are  increased,  decreased or exchanged  for a different  number or
kind of shares or other securities of the Corporation, or (ii) additional shares
or new or different shares or other non-cash assets are distributed with respect
to such  shares  of  Common  Stock  or  other  securities,  an  appropriate  and
proportionate  adjustment  shall be made in (x) the  maximum  number and kind of
shares  reserved for issuance  under the Plan, (y) the number and kind of shares
or other securities subject to any then outstanding  options under the Plan, and
(z) the price for each share subject to any then  outstanding  options under the
Plan,  without  changing the aggregate  purchase  price as to which such options
remain exercisable.  Notwithstanding the foregoing,  no adjustment shall be made
pursuant to this Section 15 if such  adjustment (i) would cause the Plan to fail
to  comply  with  Section  422 of the Code or with Rule  16b-3 or (ii)  would be
considered as the adoption of a new plan requiring stockholder approval.

         (b) Reorganization, Merger and Related Transactions. If the Corporation
shall  be  the  surviving   corporation   in  any   reorganization,   merger  or
consolidation of the Corporation with one or more other  corporations,  any then
outstanding  option  granted  pursuant to the Plan shall pertain to and apply to
the securities to which a holder of the number of shares of Common Stock subject
to  such  options  would  have  been   entitled   immediately   following   such
reorganization,  merger,  or consolidation,  with a corresponding  proportionate
adjustment  of the  purchase  price as to which such options may be exercised so
that the  aggregate  purchase  price as to which such  options may be  exercised
shall be the same as the aggregate  purchase  price as to which such options may
be exercised for the shares remaining  subject to the options  immediately prior
to such reorganization, merger, or consolidation.

         (c) Board Authority to Make  Adjustments.  Any  adjustments  made under
this Section 15 will be made by the Board of Directors,  whose  determination as
to what adjustments,  if any, will be made and the extent thereof will be final,
binding and  conclusive.  No fractional  shares will be issued under the Plan on
account of any such adjustments.


16.      Merger, Consolidation, Asset Sale, Liquidation, Etc.
         ---------------------------------------------------

              (a) General.  In the event of a  consolidation  or merger in which
the  Corporation  is  not  the  surviving   corporation,   or  sale  of  all  or
substantially all of the assets of the



                                       -9-







Corporation  in which  outstanding  shares of Common  Stock  are  exchanged  for
securities,  cash or other property of any other  corporation or business entity
or in the event of a liquidation of the Corporation (collectively,  a "Corporate
Transaction"),  the  Board of  Directors  of the  Corporation,  or the  board of
directors of any corporation  assuming the obligations of the Corporation,  may,
in its  discretion,  take  any  one or  more  of the  following  actions,  as to
outstanding  options:  (i)  provide  that  such  options  shall be  assumed,  or
equivalent  options  shall  be  substituted,  by  the  acquiring  or  succeeding
corporation  (or  an  affiliate   thereof),   provided  that  any  such  options
substituted for Incentive  Stock Options shall meet the  requirements of Section
424(a) of the Code, (ii) upon written notice to the optionees,  provide that all
unexercised options will terminate immediately prior to the consummation of such
transaction unless exercised by the optionee within a specified period following
the date of such notice, (iii) in the event of a Corporate Transaction under the
terms of which holders of the Common Stock of the Corporation  will receive upon
consummation  thereof a cash payment for each share surrendered in the Corporate
Transaction (the "Transaction Price"), make or provide for a cash payment to the
optionees equal to the difference  between (A) the  Transaction  Price times the
number of shares of Common  Stock  subject to such  outstanding  options (to the
extent then  exercisable at prices not in excess of the  Transaction  Price) and
(B) the aggregate exercise price of all such outstanding options in exchange for
the  termination of such options,  and (iv) provide that all or any  outstanding
options shall become exercisable in full immediately prior to such event.

         (b) Substitute  Options.  The  Corporation  may grant options under the
Plan in  substitution  for options held by employees of another  corporation who
become employees of the Corporation,  or a subsidiary of the Corporation, as the
result  of a merger  or  consolidation  of the  employing  corporation  with the
Corporation  or a  subsidiary  of  the  Corporation,  or  as  a  result  of  the
acquisition by the Corporation, or one of its subsidiaries, of property or stock
of the employing corporation. The Corporation may direct that substitute options
be granted  on such terms and  conditions  as the Board of  Directors  considers
appropriate in the circumstances.


17.      No Special Employment Rights.
         ----------------------------

         Nothing  contained  in the Plan or in any option  shall confer upon any
optionee any right with respect to the  continuation of his or her employment by
the Corporation or interfere in any way with the right of the Corporation at any
time to terminate such employment or to increase or decrease the compensation of
the optionee.


                                      -10-







18.      Other Employee Benefits.
         -----------------------

         Except  as to plans  which by  their  terms  include  such  amounts  as
compensation,  the  amount  of any  compensation  deemed  to be  received  by an
employee as a result of the exercise of an option or the sale of shares received
upon such exercise will not  constitute  compensation  with respect to which any
other  employee  benefits of such employee are  determined,  including,  without
limitation, benefits under any bonus, pension, profit-sharing, life insurance or
salary  continuation  plan, except as otherwise  specifically  determined by the
Board of Directors.


19.      Amendment of the Plan.
         ---------------------

         (a) The  Board of  Directors  may at any  time,  and from time to time,
modify or amend the Plan in any respect, except that if at any time the approval
of the stockholders of the Corporation is required under Section 422 of the Code
or any successor  provision with respect to Incentive  Stock  Options,  or under
Rule 16b-3, the Board of Directors may not effect such modification or amendment
without such approval.

         (b) The termination or any  modification or amendment of the Plan shall
not,  without  the  consent of an  optionee,  affect his or her rights  under an
option  previously  granted  to him or her.  With the  consent  of the  optionee
affected,  the Board of Directors may amend  outstanding  option agreements in a
manner not  inconsistent  with the Plan.  The Board of Directors  shall have the
right to amend or modify  (i) the terms  and  provisions  of the Plan and of any
outstanding  Incentive  Stock  Options  granted  under  the  Plan to the  extent
necessary to qualify any or all such options for such  favorable  federal income
tax treatment  (including deferral of taxation upon exercise) as may be afforded
incentive  stock  options  under  Section 422 of the Code and (ii) the terms and
provisions of the Plan and of any outstanding  option to the extent necessary to
ensure the qualification of the Plan under Rule 16b-3.


20.      Withholding.
         -----------

         (a) The Corporation shall have the right to deduct from payments of any
kind otherwise due to the optionee any federal, state or local taxes of any kind
required by law to be withheld  with respect to any shares  issued upon exercise
of options  under the Plan.  Subject to the prior  approval of the  Corporation,
which may be withheld by the  Corporation in its sole  discretion,  the optionee
may elect to satisfy such  obligations,  in whole or in part, (i) by causing the
Corporation to withhold  shares of Common Stock otherwise  issuable  pursuant to
the exercise of an option or (ii) by  delivering  to the  Corporation  shares of
Common Stock already owned by the optionee.  The shares so delivered or withheld
shall have a Fair Market Value equal to such withholding


                                      -11-






obligation  as of the  date  that  the  amount  of tax to be  withheld  is to be
determined.  An optionee who has made an election pursuant to this Section 20(a)
may only satisfy his or her  withholding  obligation with shares of Common Stock
which are not  subject to any  repurchase,  forfeiture,  unfulfilled  vesting or
other similar requirements.

         (b) The  acceptance  of shares  of Common  Stock  upon  exercise  of an
Incentive  Stock  Option  shall  constitute  an agreement by the optionee (i) to
notify  the  Corporation  if any or all of such  shares are  disposed  of by the
optionee  within two years  from the date the  option was  granted or within one
year from the date the shares were  transferred to the optionee  pursuant to the
exercise  of  the  option,  and  (ii)  if  required  by  law,  to  remit  to the
Corporation,  at the time of and in the case of any such disposition,  an amount
sufficient to satisfy the Corporation's federal, state and local withholding tax
obligations with respect to such disposition, whether or not, as to both (i) and
(ii),  the  optionee  is in the  employ of the  Corporation  at the time of such
disposition.

         (c)  Notwithstanding  the foregoing,  in the case of a Reporting Person
whose  options have been granted in  accordance  with the  provisions of Section
3(b)  herein,  no election to use shares for the  payment of  withholding  taxes
shall be effective unless made in compliance with any applicable requirements of
Rule 16b-3.


21.      Cancellation and New Grant of Options, Etc.
         ------------------------------------------

         The Board of Directors shall have the authority to effect,  at any time
and from time to time,  with the  consent  of the  affected  optionees,  (i) the
cancellation of any or all  outstanding  options under the Plan and the grant in
substitution  therefor  of new  options  under  the  Plan  covering  the same or
different  numbers of shares of Common Stock and having an option exercise price
per share which may be lower or higher than the exercise  price per share of the
cancelled  options or (ii) the amendment of the terms of any and all outstanding
options  under the Plan to provide an option  exercise  price per share which is
higher  or  lower  than  the  then  current  exercise  price  per  share of such
outstanding options.


22.      Effective Date and Duration of the Plan.
         ---------------------------------------

         (a) Effective Date. The Plan shall become effective when adopted by the
Board of Directors,  but no Incentive  Stock Option granted under the Plan shall
become  exercisable  unless and until the Plan shall have been  approved  by the
Corporation's stockholders.  If such stockholder approval is not obtained within
twelve  (12)  months  after the date of the  Board's  adoption  of the Plan,  no
options previously granted under the Plan shall



                                      -12-







be deemed to be Incentive  Stock Options and no Incentive Stock Options shall be
granted thereafter.  Amendments to the Plan not requiring  stockholder  approval
shall  become  effective  when  adopted  by the Board of  Directors;  amendments
requiring  stockholder  approval  (as  provided  in  Section  19)  shall  become
effective when adopted by the Board of Directors,  but no Incentive Stock Option
granted after the date of such amendment shall become exercisable (to the extent
that such amendment to the Plan was required to enable the  Corporation to grant
such  Incentive  Stock  Option to a particular  optionee)  unless and until such
amendment shall have been approved by the  Corporation's  stockholders.  If such
stockholder  approval is not obtained  within  twelve (12) months of the Board's
adoption of such amendment,  any Incentive Stock Options granted on or after the
date of such amendment  shall terminate to the extent that such amendment to the
Plan was required to enable the Corporation to grant such option to a particular
optionee.  Subject to this limitation,  options may be granted under the Plan at
any time after the effective  date and before the date fixed for  termination of
the Plan.

         (b)  Termination.  Unless sooner  terminated in accordance with Section
16, the Plan shall  terminate  upon the  earlier of (i) the close of business on
the day next  preceding the tenth  anniversary of the date of is adoption by the
Board of Directors,  or (ii) the date on which all shares available for issuance
under the Plan shall have been issued  pursuant to the exercise or  cancellation
of options  granted  under the Plan.  If the date of  termination  is determined
under (i) above,  then options  outstanding  on such date shall continue to have
force and effect in accordance with the provisions of the instruments evidencing
such options.


23.      Provision for Foreign Participants.
         ----------------------------------

         The Board of Directors may, without amending the Plan, modify awards or
options granted to participants  who are foreign  nationals or employed  outside
the United  States to  recognize  differences  in laws,  rules,  regulations  or
customs of such foreign jurisdictions with respect to tax, securities, currency,
employee benefit or other matters.


24.      Governing Law.
         -------------

         The  provisions  of this  Plan  shall  be  governed  and  construed  in
accordance  with  the  laws of the  State  of New  York  without  regard  to the
principles of conflicts of laws.

                                              Originally Adopted by the Board of
                                              Directors on April 15, 1993



                                      -13-




                                                                       EXHIBIT 5
                                                                       ---------

                                  WIGGIN & DANA
                                One Century Tower
                            New Haven, CT 06508-1832
                             Telephone 203-498-4400
                              Telefax 203-782-2889



November 4, 1997

VION PHARMACEUTICALS, INC.
4 Science Park
New Haven, CT  06511

Ladies and Gentlemen:

     We  refer to the  Registration  Statement  on Form  S-8 (the  "Registration
Statement")  filed  with  the  Securities  and  Exchange  Commission  under  the
Securities Act of 1933, as amended (the "Act"),  by Vion  Pharmaceuticals,  Inc.
(the  "Company"),  relating to an  additional  500,000  shares of the  Company's
Common Stock,  $.01  par value per share  (collectively,  the  "Shares"),  to be
issued  under the  Company's  Amended and  Restated  1993 Stock Option Plan (the
"Plan").

     As counsel for the Company, we have examined such corporate records,  other
documents,  and  such  questions  of  law as we  have  considered  necessary  or
appropriate  for the  purposes  of this  opinion  and,  upon  the  basis of such
examination,  advise  you  that in our  opinion,  the  Shares  being  registered
pursuant to the Registration Statement,  when issued and paid for under the Plan
in accordance  with the terms of the Plan, will be, when so issued and paid for,
duly authorized, legally issued, fully paid, and non-assessable.

     We hereby  consent  to the  filing of this  opinion  as an  exhibit  to the
Registration Statement. This consent is not to be construed as an admission that
we are a person  whose  consent is  required  to be filed with the  Registration
Statement under the provisions of the Act.

                                                           Very truly yours,

                                                           /s/ WIGGIN & DANA


 
                                                                    EXHIBIT 23.1
                                                                    ------------

                        CONSENT OF INDEPENDENT AUDITORS


We consent to the incorporation by reference in the Registration Statement (Form
S-8)  pertaining  to the Amended  And  Restated  1993 Stock  Option Plan of Vion
Pharmaceuticals,  Inc. of our report dated February 12, 1997 with respect to the
consolidated financial statements of Vion Pharmaceuticals,  Inc. included in its
Annual Report (Form 10-KSB) for the year ended December 31, 1996, filed with the
Securities and Exchange Commission.


                                                           /s/ ERNST & YOUNG LLP
                                                           
                                                           


Hartford, Connecticut
October 30, 1997



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