SHEFFIELD PHARMACEUTICALS INC
8-K, 1997-12-18
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                             -----------------------

                                    Form 8-K

                                 CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of the

                         Securities Exchange Act of 1934


Date of Report (Date of earliest event reported): December 3, 1997
                                                  -----------------

                         Sheffield Pharmaceuticals, Inc.
             (Exact name of registrant as specified in its charter)


    New York                     1-12584           13-3808303
- --------------------------------------------------------------------------------
(State or other jurisdiction   (Commission       (IRS Employer
     of incorporation)         File Number)   Identification No.)


            425 South Woodsmill Road, Suite 270, St. Louis, Missouri 63017
- --------------------------------------------------------------------------------
                    (Address of principal executive offices)


Registrant's telephone number, including area code: (314) 579-9899


                 30 Rockefeller Plaza, New York, New York 10112
- --------------------------------------------------------------------------------
         (Former name or former address, if changed since last report.)

                             Exhibit Index on Page 3


<PAGE>
         Item 5.           ACQUISITION OR DISPOSITION OF ASSETS.

         On  December  3,  1997,  the  Registrant,   through  its  wholly  owned
subsidiary, Ion Pharmaceuticals,  Inc. ("Ion"), entered into an agreement with a
1266417 Ontario Limited  ("Immutec  Sub"), a subsidiary of Immutec Pharma,  Inc.
("Immutec"),  providing  for the sale of the  Registrant's  patent  interests in
three U.S. patent  applications (and corresponding  international  patents),  in
each case relating to certain New Chemical  Entities (NCE's) in the treatment of
cancer, actinic keratosis and Kaposi's sarcoma (the "Patent Interests"), and the
Registrant's  interest in an Invention  Disclosure  relating to a topical  cream
formulation  for  clotrimazole  to  Immutec  Sub.  The  assignment  and sale was
pursuant to the terms of an  assignment  and license  agreement  between Ion and
Immutec  Sub  (the  "Assignment   Agreement").   In  addition,   the  Registrant
sublicensed  the  interest of Harvard  College  and  Children's  Medical  Center
Corporation  in the Patent  Interests  and  additional  rights  licensed  to the
Registrant by Harvard College and Children's Medical Center Corporation  related
to clotrimazole  and its use in the treatment of cancer,  actinic  keratosis and
Kaposi's sarcoma to Immutec Sub pursuant to a sub-license  agreement between Ion
and Immutec Sub (the "License Agreement").

         Pursuant to the Assignment  Agreement,  the Registrant will receive (i)
20% of the common stock of Immutec Sub, (ii) $75,000 (received by the Registrant
at the closing of the  transaction),  (iii)  $75,000 on or prior to December 31,
1997,  (iv)  $350,000 in shares of common  stock of Immutec and (v)  $850,000 in
milestone payments through receipt of marketing approval for any of the NCE's.

         Pursuant to the License  Agreement  the  Registrant  will  receive from
Immutec  Sub  (i)  $175,000  (received  by  Registrant  at  the  closing  of the
transaction),  (ii) $175,000 on or before December 31, 1997 and (iii) $2,150,000
to be paid in the future subject to achievement of certain milestones.

         Copies of the Assignment  Agreement and License  Agreement are attached
as exhibits to this report.


         Item 7.           FINANCIAL STATEMENTS, PRO FORMA FINANCIAL
                           INFORMATION AND EXHIBITS.

         (c)      EXHIBITS.

         10(a)             Assignment and License Agreement dated as of December
                           3,  1997  between  1266417  Ontario  Limited  and Ion
                           Pharmaceuticals,  Inc.  (portions of this exhibit are
                           omitted and were filed separately with the Securities
                           Exchange Commission pursuant to the

                                       -2-

<PAGE>
                           Company's   application    requesting    confidential
                           treatment   in   accordance   with   Rule   24b-2  as
                           promulgated under the Securities Exchange Act of
                           1934, as amended).

         10(b)             Sub-License  Agreement  dated as of  December 3, 1997
                           between    1266417    Ontario    Limited    and   Ion
                           Pharmaceuticals,  Inc.  (portions of this exhibit are
                           omitted and were filed separately with the Securities
                           Exchange   Commission   pursuant  to  the   Company's
                           application  requesting   confidential  treatment  in
                           accordance  with Rule 24b-2 as promulgated  under the
                           Securities Exchange Act of 1934, as amended).

                                       -3-

<PAGE>

                                    SIGNATURE


                  Pursuant to the requirements of the Securities Exchange Act of
1934,  the  Registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.


                                                SHEFFIELD PHARMACEUTICALS, INC.



Dated: December 18, 1997                        By:  /s/ Judy Roeske Bullock
                                                     ------------------------
                                                     Judy Roeske Bullock
                                                     Vice President & Chief
                                                     Financial Officer


                                       -4-
<PAGE>
                                  EXHIBIT LIST

         10(a)             Assignment and License Agreement dated as of December
                           3,  1997  between  1266417  Ontario  Limited  and Ion
                           Pharmaceuticals,  Inc.  (portions of this exhibit are
                           omitted and were filed separately with the Securities
                           Exchange   Commission   pursuant  to  the   Company's
                           application  requesting   confidential  treatment  in
                           accordance  with Rule 24b-2 as promulgated  under the
                           Securities Exchange Act of 1934, as amended).

         10(b)             Sub-License  Agreement  dated as of  December 3, 1997
                           between    1266417    Ontario    Limited    and   Ion
                           Pharmaceuticals,  Inc.  (portions of this exhibit are
                           omitted and were filed separately with the Securities
                           Exchange   Commission   pursuant  to  the   Company's
                           application  requesting   confidential  treatment  in
                           accordance  with Rule 24b-2 as promulgated  under the
                           Securities Exchange Act of 1934, as amended).

                                       -5-


                                                                           10(a)

                        ASSIGNMENT AND LICENSE AGREEMENT


                  THIS  ASSIGNMENT AND LICENSE  AGREEMENT (the  "Agreement")  is
made as of the third day of December,  1997, between 1266417 Ontario Limited, an
Ontario  corporation  with  offices  at 1285  Morningside  Avenue,  Scarborough,
Ontario  M1B 3W2  (hereinafter  "NEWCO"),  and  Ion  Pharmaceuticals,  Inc.,  an
American  corporation located at Suite 208, 124 Mount Auburn Street,  Cambridge,
MA 02138-5700 (hereinafter "ION").


                  WHEREAS:

         A. ION is the  co-owner  (together  with the  President  and Fellows of
Harvard  College  ("HARVARD")  and the  Children's  Medical  Center  Corporation
("CMCC")) of the patents and, patent applications listed in Appendix A, ("Patent
Rights")  encompassing new chemical entities  ("NCE's") and the use of the NCE's
in  the  treatment  and  diagnosis  of  cancer,  Kaposi's  sarcoma  and  actinic
keratosis.

         B. NEWCO,  a newly  formed  Ontario  subsidiary  of Imutec  Pharma Inc.
("Imutec") in which ION is a shareholder  through a shareholder  agreement dated
December 3, 1997 between Imutec,  NEWCO and ION (the  "Shareholder  Agreement"),
wishes to acquire  ION's  ownership  interest  in all the Patent  Rights and ION
wishes to assign the same to NEWCO in exchange for certain  payments  (described
herein in  Article  4) and a grant  from  NEWCO of an  irrevocable,  world-wide,
exclusive, fully paid-up license for the NCE's listed in Appendix B.

         C. ION is party (the Licensee) to a license  agreement dated August 22,
1994 between ION and HARVARD (the "License  Agreement") which grants ION certain
rights in the Patent Rights,  as well as rights  HARVARD holds,  if any, to "all
patentable and unpatentable technology,  licensed products,  compounds, devices,
models,  things,  know-how,  methods,   documents,   materials,  and  all  other
information" related to the Patent Rights.

         D. NEWCO  wishes to obtain a  sublicense  under the  License  Agreement
between  ION and HARVARD  referred to in clause C above,  and ION is able to and
wishes to grant the same to NEWCO in exchange for certain  payments as described
in the sub-license agreement appended to this Assignment Agreement as Appendix C
(the "Sub-license Agreement").

                  NOW,  THEREFORE,  in  consideration  of the  mutual  covenants
herein  contained  and  intending  to be legally  bound,  NEWCO and ION agree as
follows:



<PAGE>
                                    ARTICLE 1
                                   DEFINITIONS

The following terms, as used herein, shall have the following meanings:

1.01 "Lead  Compounds"  shall mean those  compounds which have [Text Omitted] as
determined and selected by NEWCO from the NCEs.

1.02  "Patent  Rights"  shall mean ION's  rights  under any  patents  and patent
applications,  as  identified  in Appendix A hereto.  The "Patent  Rights"  also
include  any  continuation,   continuation-in-part,   extension,   division,  or
substitution  to  such   applications  and  all  patents  which  are  re-issues,
re-examinations  and  registrations  based  thereon,  as well  as  corresponding
applications and patents in other countries,  to the extent that ION is an owner
or  co-owner  in such patent or patent  application  and the  subject  matter is
related  to the Field of Use and  entitled  to the  priority  date of the parent
application,  to the  extent  that ION is  legally  able to do so.  The  "Patent
Rights" expressly exclude any continuation, continuation-in-part, or division of
[Text Omitted].

1.03 "Field of Use" shall mean in the diagnosis and treatment of cancer, actinic
keratosis and Kaposi's Sarcoma.

1.04 "Licensed NCE's" shall mean those NCE's listed in Appendix B.

                                    ARTICLE 2
                                   ASSIGNMENT

2.01 ASSIGNMENT OF PATENT RIGHTS. Upon satisfaction of NEWCO's payment to ION of
the amounts  specified in paragraph  4.01 (a) and (b), ION shall assign to NEWCO
the Patent Rights  authorizing  the release of Assignments in escrow as provided
for in  Paragraph  2.02 and pursuant to the terms and  conditions  of the escrow
agreement  set forth in  Appendix  D (the  "Escrow  Agreement").  ION  agrees to
execute whatever formal assignment documents are required for all Patent Rights.
In recognition of ION's ownership of certain subject matter  expressly  excluded
in the  definition  of Patent  Rights  defined in  Paragraph  1.02,  NEWCO shall
execute  whatever formal  assignment  documents that are required to ensure such
excluded Patent Rights are assigned to ION, if necessary.

2.02 To  facilitate  the transfer of the  Assignments  for the Patent  Rights to
NEWCO,  within five (5) days of the effective date of this  Agreement,  ION will
execute the  Assignments  in the form in Appendix E. The parties  agree that the
executed  Assignments shall be held in escrow by an escrow agent selected by ION
and  reasonably  acceptable  to NEWCO.  The terms and  conditions  of the Escrow
Agreement are set forth in Appendix D.




                                       -2-

<PAGE>
2.03 In the event of a termination of this Agreement pursuant to Paragraph 9.01,
NEWCO will promptly assign back to ION all of the Patent Rights.

2.04 In the event of a termination of this Agreement  pursuant to Paragraph 9.02
or  Paragraph  9.03,  within 30 days of the Default or  Discontinuance,  ION may
elect in writing to re-acquire  the Patent  Rights.  If ION so elects,  and upon
prompt  payment by ION to NEWCO in  accordance  with the  schedule  provided  in
Paragraph 9.04, NEWCO will promptly assign back to ION all of the Patent Rights,
as well as, all  pre-clinical  and  clinical  data,  clinical  trial  protocols,
regulatory  filings,  research program reports and any other information related
to the  Patent  Rights.  NEWCO  agrees to  execute  whatever  formal  assignment
documents that are required by Ion to affect such assignment.

                                    ARTICLE 3
                                     LICENSE

3.01 NEWCO hereby grants to ION an  exclusive,  world-wide,  irrevocable,  fully
paid-up  license  to the NCE's  listed in  Appendix B to make,  have made,  use,
import, offer to sell, sell or otherwise commercialize outside the Field of Use.
NEWCO  acknowledges  and agrees that it does not reserve any rights in the NCE's
(listed in Appendix B) and their uses outside the Field of Use.

3.02 NEWCO  hereby  acknowledges  and agrees  that the  license  granted in this
Article 3 cannot be  terminated  by NEWCO  and  shall  extend  until the last to
expire of the Patent Rights,  except if ION's  activities or those activities of
any  sublicensee of ION relating to the Licensed  NCE's intrude,  in any way, in
the Field of Use,  whereby NEWCO may revoke the license  granted in this Article
3, upon seven (7) days notice to ION.

                                    ARTICLE 4
                  COMPENSATION FOR ASSIGNMENT OF PATENT RIGHTS

4.01  PAYMENTS  BY NEWCO.  In  consideration  for the  assignment  as set out in
Article 2, NEWCO will pay up to $1,350,000 U.S. to ION as follows:

         a)  $[Text  Omitted]  U.S.  to be paid in two  installments,  the first
installment  to be paid upon the  execution  of this  Agreement,  and the second
installment to be paid before [Text Omitted];

         b) $[Text  Omitted]  U.S.  in Imutec  shares  at a  milestone  on [Text
Omitted],  with the number of shares to be determined  based on the lower of (i)
the closing price of Imutec shares on June 10, 1998 and (ii) 150% of the closing
price of Imutec  shares on the Closing Date (as defined in the Letter  Agreement
between ION and Imutec dated  November 19, 1997),  such shares to be in addition
to the NEWCO shares issued to ION pursuant to the Shareholder Agreement;


                                       -3-

<PAGE>
         c) $[Text Omitted] U.S. milestone  payment,  earned at a milestone date
that is sixty  (60)  days  after the  completion  of the  treatment  of the last
subject in the first  Phase I trial and payable to ION prior to  initiating  the
first Phase II trial with the first of any of the Lead  Compounds  but not later
than one hundred and eighty  (180) days of  completion  of the  treatment of the
last subject in the first Phase I trial;

         d) $[Text Omitted] U.S. milestone  payment,  earned at a milestone date
that is sixty  (60)  days  after the  completion  of the  treatment  of the last
subject in the first Phase II trial and payable to ION prior to  initiating  the
first Phase III trial with the first of any of the Lead  Compounds but not later
than one hundred and eighty  (180) days of  completion  of the  treatment of the
last subject in the first Phase II trial;

         e) $[Text Omitted] U.S. milestone  payment,  earned at a milestone date
that is sixty  (60)  days  after the  completion  of the  treatment  of the last
subject  in the last  pivotal  Phase III trial and  payable  to ION  within  one
hundred and eighty (180) days of completion of the treatment of the last subject
in the last pivotal Phase III trial for the first of any of the Lead  Compounds;
and

         f) $[Text Omitted] U.S. final milestone payment,  earned at a milestone
date which is the date of receipt of  marketing  approval in the United  States,
Canada, England or France for the first of any of the Lead Compounds and payable
to ION within  thirty  (30) days of the  receipt of  marketing  approval  in the
United  States,  Canada,  England  or  France  for the  first of any of the Lead
Compounds.

For further  clarification,  in the event any of the  clinical  trials for which
payments  described above are due ION by NEWCO and which are multi-phased,  then
the payment due ION shall be made for each milestone  described  above addressed
by such multi-phased trial (i.e., if there is a Phase II/III trial, which is the
first in both Phase II and Phase  III,  then ION  receives  $[Text  Omitted]  in
satisfaction of milestone payments described in (c) and (d) above).

                                    ARTICLE 5
                         REPORTING OBLIGATIONS OF NEWCO

5.01 NEWCO shall promptly notify ION of the commencement of each of the clinical
trials  listed in Article 4 and shall,  within  fifteen (15) days of the date of
each  milestone  achieved as identified in Paragraph  4.01(c),  (d), (e) and (f)
above (i.e. the date each clinical trial is  completed),  shall provide  written
notice to ION that such  milestone has been  accomplished  and identify the date
such milestone was accomplished.

5.02 NEWCO shall provide to ION written  annual  reports within thirty (30) days
after June 30 of each calendar year which shall include,  but not be limited to,
reports of progress on research and development, clinical trials, and regulatory
and marketing  approvals obtained during the preceding twelve (12) month period,
as well as plans for the upcoming year.


                                       -4-

<PAGE>

The annual report  supplied to ION pursuant to the  Sub-license  Agreement  will
satisfy this requirement.

                                    ARTICLE 6
                          INTELLECTUAL PROPERTY RIGHTS

6.01 PATENTS. Decisions regarding the preparation,  prosecution, and maintenance
of the  Patent  Rights  shall  be made  in  accordance  with  the  terms  of the
Sub-license Agreement.

6.02  COOPERATION.  ION shall fully  cooperate with NEWCO in the preparation and
prosecution  of all Patent  Rights and shall ensure that its  employees  and the
inventors of such Patent Rights do the same, which may require ION to secure the
cooperation  of [Text  Omitted]  and the  inventors  who are  employees of [Text
Omitted] to the extent possible.  This shall include, but not be limited to, the
execution  of all  petitions,  declarations,  Power  of  Attorneys,  and  formal
assignments  necessary to transfer ION's ownership interest in the Patent Rights
to NEWCO.

6.03 PATENT INFRINGEMENT BY OTHERS. Any infringement of any of the Patent Rights
or other Assigned Technology which comes to the attention of either ION or NEWCO
shall be handled in accordance with the terms of the Sub-license Agreement.

                                    ARTICLE 7
                   CONFIDENTIALITY AND TRADE SECRETS PUBLICITY

7.01  CONFIDENTIALITY  OBLIGATIONS  OF ION.  ION  shall  keep  confidential  all
information  contained in the Patent Rights ("NEWCO Confidential  Information"),
however,  the confidentiality  obligations of ION under this Agreement shall not
apply to:

         (a)      NEWCO Confidential Information related to the Licensed NCE's;

         (b) NEWCO  Confidential  Information which is necessary to be disclosed
to  HARVARD  in order for ION to  fulfill  its  obligations  under  the  License
Agreement;  ION  shall  require  HARVARD  to  sign  a  non-disclosure  agreement
regarding any NEWCO  Confidential  Information  to be provided by ION to HARVARD
under the  License  Agreement,  and shall  supply a copy of said  non-disclosure
agreement to NEWCO,  thirty (30) days prior to ION  submitting  its first annual
report after the date of this Agreement to HARVARD under the License Agreement;

         (c) NEWCO Confidential  Information which is generally available to the
public or which becomes available to the general public through no fault of ION;
or

         (d)  NEWCO  Confidential  Information  that  is  required  by law to be
disclosed,  provided  that  ION  has  advised  NEWCO  of the  demand,  subpoena,
interrogatory  or other legal process in advance of such  disclosure in order to
allow NEWCO to obtain a protective order

                                       -5-

<PAGE>

or other remedy, in which such case, such NEWCO  Confidential  Information shall
continue  to be treated as NEWCO  Confidential  Information  to the extent it is
covered by a protective order or equivalent.

7.02  CONFIDENTIALITY  OBLIGATIONS OF NEWCO.  NEWCO shall keep  confidential all
information  related to the  Licensed  NCE's ("ION  Confidential  Information"),
however, the confidentiality obligations of NEWCO under this Agreement shall not
apply to:

         (a) ION Confidential  Information  which is generally  available to the
public or which  becomes  available  to the general  public  through no fault of
NEWCO; or

         (b)  ION  Confidential  Information  that  is  required  by  law to the
disclosed,  provided  that  NEWCO  has  advised  ION  of the  demand,  subpoena,
interrogatory  or other legal process in advance of such  disclosure in order to
allow ION to obtain a protective order or other remedy, in which such case, such
ION  Confidential  Information  shall continue to be treated as ION Confidential
Information to the extent it is covered by a protective order or equivalent.

7.03  PUBLICITY.  Except as  provided by this  Agreement  or as required by law,
neither  party shall  originate  any  publicity,  news  release or other  public
announcement,  written or oral,  relating to this  Agreement,  without the prior
written  approval of the other party,  which approval shall not be  unreasonably
withheld. Each party shall furnish the other party promptly with one (1) copy of
all such  documents  which make reference to the other party with regard to this
Agreement.

                                    ARTICLE 8
                         WARRANTIES AND REPRESENTATIONS

8.01 WARRANTIES AND  REPRESENTATIONS BY ION. ION warrants that it has the lawful
right and  authority  to enter  into  this  Agreement  without  the  consent  or
authority of another person or entity.

         ION warrants  that it co-owns with HARVARD and CMCC all rights,  title,
and interest in and to the Patent Rights.

         ION warrants that to the best of its  knowledge,  the Patent Rights are
in good standing,  i.e., that all proper assignments have been made transferring
to ION a one-third  interest in all rights,  title,  and  interest in and to the
Patent  Rights,  that all  annuities  have been paid in  respect  of the  Patent
Rights,  and that none of the  Patent  Rights  is the  subject  of any  protest,
opposition interference,  re-examination, impeachment proceedings, litigation or
any other proceeding.

         ION warrants  that to its  knowledge as of the  effective  date of this
Agreement,   the  patents  and  patent  applications  contained  in  Appendix  A
constitute all the patents and patent

                                       -6-

<PAGE>
applications  owned or  co-owned  by ION  which  relate  to (i) the use of [Text
Omitted]  in the Field of Use,  (ii) the NCE's and (iii) the use of NCE's in the
Field of Use.

         ION further  warrants that to its knowledge as of the effective date of
this  Agreement,  ION does not own or co-own any  additional  know-how  or trade
secrets relating to the use of [Text Omitted] in the Field of Use, the NCE's, or
the use of the NCE's in the Field of Use, which are not  specifically  described
in the Patent Rights.

         ION further  warrants that, as of the effective date of this Agreement,
it has disclosed all patentable and unpatentable matter that it owns or co-owns,
that  relates to [Text  Omitted]  and the use of [Text  Omitted] in the Field of
Use,  the  NCE's  and the use of the  NCE's in the  Field of Use,  and any other
compounds or chemical entities relating to the Field of Use.

         ION warrants  that to the best of its  knowledge as of the date of this
Agreement,  the Patent Rights do not infringe any  intellectual  property rights
belonging to any person or entity other than ION.  NEWCO  acknowledges  that ION
has not undertaken any specific  infringement analysis with regard to the Patent
Rights.

8.02  WARRANTIES AND  REPRESENTATIONS  BY NEWCO.  NEWCO warrants that it has the
lawful right and authority to enter into this  Agreement  without the consent or
authority of another person or entity.

8.03  DISCLAIMER  OF  WARRANTIES  AND  REPRESENTATIONS.  EXCEPT  AS SET FORTH IN
PARAGRAPH  8.01 ABOVE,  ION MAKES NO WARRANTIES OR  REPRESENTATIONS,  EXPRESS OR
IMPLIED,  INCLUDING  BUT NOT LIMITED TO,  WARRANTIES OF FITNESS FOR A PARTICULAR
PURPOSE OR  MERCHANTABILITY,  REGARDING THE RIGHTS ASSIGNED BY THIS AGREEMENT OR
THE PATENT RIGHTS.  NOTHING IN THIS AGREEMENT  SHOULD BE CONSTRUED AS A WARRANTY
OR  REPRESENTATION  BY ION AS TO THE  VALIDITY  OR  SCOPE  OF ANY OF THE  PATENT
RIGHTS,  OR A WARRANTY OR  REPRESENTATION  THAT  ANYTHING  MADE,  USED,  SOLD OR
OTHERWISE DISPOSED OF UNDER ANY RIGHTS ASSIGNED TO NEWCO BY THIS AGREEMENT IS OR
WILL BE FREE FROM INFRINGEMENT OF PATENTS OF THIRD PARTIES.

                                    ARTICLE 9
                                   TERMINATION

9.01 In the event that NEWCO fails to pay the  payments  pursuant  to  paragraph
4.01  when due  (hereinafter  a Default  ), ION may  terminate  this  Agreement,
provided  that ION has given  NEWCO seven (7) days  notice of the  default,  and
NEWCO has failed to make such payment during that seven day period.  NEWCO shall
promptly assign all of the Patent Rights to ION pursuant to paragraph 2.03.


                                       -7-

<PAGE>
9.02 In  the event  that NEWCO  advises  ION by way of  written  notice  that it
intends to cause NEWCO to discontinue  its research and  development  activities
(hereinafter a Discontinuance ), ION may terminate this Agreement, provided that
ION has within 60 days of the written notice of  discontinuance,  advised NEWCO,
in writing,  of its intention to so terminate  this  Agreement.  Notice by NEWCO
that occurs during the period  between the date on which a milestone  payment is
earned  and the date on which it is  payable,  as defined in Article 4, shall be
considered a Default under paragraph 9.01 unless the earned milestone payment is
made to ION on or prior to the payable  date defined in Article 4, in which case
such  notice will be a  Discontinuance  under the terms and  conditions  of this
Paragraph.

9.03 In the event  that  NEWCO  becomes  involved  in  insolvency,  dissolution,
bankruptcy or receivership  proceedings  affecting the operation of its business
or in the event  that  NEWCO  shall  discontinue  its  business  for any  reason
(hereinafter a Default), ION may terminate this Agreement.

9.04 For the  purposes of  Paragraphs  9.02 and 9.03,  and pursuant to paragraph
2.04, the payment schedule is as follows:

         (i) where the Default or Discontinuance  occurs prior to the completion
of the pre- clinical research programs of the Lead Compounds, [Text Omitted].

         (ii) where the Default or Discontinuance occurs after the completion of
the pre-  clinical  research  programs  of the Lead  Compounds,  and  before the
completion of Phase I clinical trials [Text Omitted].

         (iii) where the Default or  Discontinuance  occurs after the completion
of the Phase I clinical  trials and before the  completion  of Phase II clinical
trials [Text Omitted].

         (iv) where the Default or Discontinuance occurs after the completion of
the Phase II clinical  trials and before the  completion  of Phase III  clinical
trials [Text Omitted].

         (v) where the Default or Discontinuance  occurs after the completion of
the Phase III clinical trials,  [Text Omitted]from the date of this Agreement to
the date that the Default or Discontinuance occurs.

9.05 The Patent  Rights  will  remain the  property of NEWCO if (i) Ion fails to
give notice under 9.01,  9.02 or 9.03 as applicable,  or (ii) Ion fails to [Text
Omitted] pursuant to Paragraph 9.04 within 90 days of the termination.

9.06 No termination of this Agreement shall constitute a termination or a waiver
of any rights or obligations of either party against the other party accruing at
or prior to the time of such termination.


                                       -8-

<PAGE>
9.07 The  terms and  provisions,  covenants  and  conditions  contained  in this
Agreement  which by the terms hereof  require their  performance  by the parties
after the  expiration  or  termination  of this  Agreement,  shall be and remain
enforceable  notwithstanding  said  expiration  or  other  termination  of  this
Agreement for any reason whatsoever. [Text Omitted] The obligations contained in
Paragraph 7.01 shall also survive the termination of this Agreement,  should the
Patent Rights not be assigned back to ION under the terms and conditions of this
Agreement.

                                   ARTICLE 10
                                  MISCELLANEOUS

10.01             RESOLUTION OF DISPUTES.

         (a) In the event that a dispute  or  disagreement  (hereinafter  called
"Dispute")  arises between the parties in connection with the  interpretation of
any provision of this Agreement or the compliance or noncompliance therewith, or
the validity or enforceability  thereof, or the performance or nonperformance of
either party to the Agreement, the following Dispute resolution process shall be
followed by the parties:

         (1) A Dispute  will be deemed to have  arisen  upon the  delivery  of a
written  notice by one party to the other  describing  the Dispute  (hereinafter
called the "Dispute  Notice").  Upon delivery of the Dispute Notice, the parties
agree to attempt  to resolve  the  Dispute in a prompt and  expeditious  manner,
through  negotiations between ION and NEWCO  representatives  designated by each
party to represent them in said negotiations. Except for the Dispute Notice, all
communications between the parties will be on a without prejudice basis.

         (2) If the  parties  have not been able to  resolve  the  Dispute  in a
prompt and  expeditious  manner  (within 30 days) after  delivery of the Dispute
Notice, either party may at any time thereafter request by written notice to the
other party that the Dispute be escalated to Senior Management.

         (3) In the event such a request with written notice is made, each party
shall  make  available  the  senior   executives   specified  in  the  following
subparagraph  ("Senior  Management") who shall meet within fifteen (15) business
days after such  request is made at the offices of the party which  received the
request to attempt to resolve the Dispute.

         (4) The Senior Management appointee for each party is as follows:

                  NEWCO:            Corporate Secretary

                  ION:              Corporate Secretary

                  Either party may change its Senior  Management  appointee upon
prior written notice to the other party.


                                       -9-

<PAGE>
         (b) In case such Dispute is not settled  amicably by Senior  Management
within thirty (30) days of escalation to Senior  Management,  such dispute shall
be arbitrated  by an  Arbitration  Board acting in accordance  with the rules of
conciliation and arbitration of the International  Chamber of Commerce in effect
on the date of the Dispute,  whose  decision shall be final and binding upon the
parties.  The Arbitration  Board shall consist of the person or persons that the
parties  may  agree on and in  default  of  agreement  within  twenty  (20) days
following the expiration of the above-mentioned  thirty (30) day period, each of
the parties in dispute  shall  nominate  one member to serve on the  Arbitration
Board and shall give  notice to the other party of the name of its  nominee.  If
one party fails to give this  notice  within  fifteen  (15) days after the other
party has done so, then the member nominated by the other party shall constitute
the Arbitration Board. If each party gives this notice,  then the two members so
nominated by agreement shall select a third member who shall be Chairman. If the
original two members are unable to agree upon a third member  within thirty (30)
days after the second  notice has been given,  the Court of  Arbitration  of the
International   Chamber  of  Commerce  shall  appoint  a  third  member  of  the
Arbitration  Board who shall be  unconditionally  accepted by both parties.  The
place of arbitration for all Disputes shall be Boston, Massachusetts, U.S.A.

                  The arbitration  hearing shall commence within sixty (60) days
after  appointment of the Arbitration Board is done and shall be completed and a
final and binding  award  rendered in writing  within  sixty (60) days after the
completion  of the hearing  unless  circumstances  warrant  delay or the parties
agree to an extension.  The decision of the Arbitration  Board may be entered in
any court of competent  jurisdiction and execution entered thereupon  forthwith.
The law specified in Paragraph 10.04 below shall apply.

                  Each party shall bear the cost of preparing its own case.  The
Arbitration  Board  shall have the right to include in the award the  prevailing
party's costs of  arbitration  and  reasonable  fees of attorneys,  accountants,
engineers and other professionals in connection with the arbitration.

                  The parties,  however,  will not be required to arbitrate  and
this  Paragraph  will not apply to any Dispute  relating to actual or threatened
unauthorized use or disclosure of confidential information or trade secrets.

10.02 NOTICES.  All notices,  statements,  reports or other writings required or
permitted  to be given by the  terms of this  Agreement  shall be sent by either
pre-paid,  registered or certified  mail, or telecopier,  properly  addressed to
NEWCO and to ION at their  respective  addresses  first  given  above or at such
other  address as one party hereto may from time to time  designate by notice in
writing to the other. Each notice shall be deemed to be given upon receipt.

10.03 WAIVER. A waiver by either party of a breach or violation of any provision
of this  Agreement  will not constitute or be construed as a waiver of any other
breach or violation of this Agreement.


                                      -10-

<PAGE>
10.04  GOVERNING  LAW.  This  Agreement  shall be  interpreted  and construed in
accordance with the laws of the Commonwealth of Massachusetts (without regard to
Massachusetts' or any other jurisdiction's  choice of law principles).  Anything
herein to the  contrary  notwithstanding,  where  interpretation  of a patent or
patent application is involved,  this Agreement is made specifically  subject to
the patent  legislation of the  jurisdiction in which any such patent is granted
or patent application filed.

10.05 ENTIRE  AGREEMENT.  This Agreement and the Appendices  attached,  together
with the Sublicense Agreement and the Shareholder Agreement, embodies the entire
understanding  of  the  parties  relating  to  the  subject  matter  hereof.  No
modification  or amendment of this Agreement shall be valid or binding except if
in writing signed by each of the parties.

10.06 NO ASSIGNMENT.  The rights of either party under this Agreement may not be
assigned,  and the  duties of  either  party  under  this  Agreement  may not be
delegated,  without the prior written consent of the other party,  which consent
shall not be unreasonably withheld; provided, however, that any party may assign
this  Agreement  to any  corporation  or  entity  with  which  it may  merge  or
consolidate,  or to which it may transfer substantially all of its assets or all
of its assets to which this Agreement relates,  without obtaining the consent of
the  other  party.   ION  may  therefore  assign  this  Agreement  to  Sheffield
Pharmaceuticals,  Inc.  (hereinafter  "Sheffield") if ION merges or consolidates
with Sheffield or transfers to Sheffield  substantially all of its assets or all
of its assets to which this Agreement relates,  without obtaining the consent of
NEWCO.

10.07  HEADINGS.  Any  headings  and  captions  used in this  Agreement  are for
convenience and reference only and are not a part of this Agreement.

10.08   COUNTERPARTS.   This   Agreement  may  be  executed  in  any  number  of
counterparts,  each of  which  shall  be  deemed  to be an  original,  and  such
counterparts together shall constitute one agreement.

10.09  LANGUAGE.  NEWCO  has  requested  that  this  Agreement  and all  related
documents  be drawn up in the English  language  with which  request ION agrees.
NEWCO a  demande  que le  present  contrat  ainsi  que  toute  la  documentation
d'accompagnement soient rediges en anglais, requete a laquille ION consent.



                                      -11-

<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have duly executed this
Assignment and License Agreement as of the date first above written.


                                       1266417 ONTARIO LIMITED


                                       By: /s/ Philippe Lacaille
                                          -------------------------------
                                          Name:   Philippe Lacaille
                                          Title:  Chairman and President


                                       By: /s/ Kerri Golden
                                          -------------------------------
                                          Name:   Kerri Golden
                                          Title:  Chief Financial Officer and
                                                  Corporate Secretary



                                       ION PHARMACEUTICALS, INC.


                                       By: /s/ Thomas Fitzgerald
                                          -------------------------------
                                          Name:   Thomas Fitzgerald
                                          Title:   President



                                      -12-

<PAGE>
                                   APPENDIX A
                               ASSIGNED TECHNOLOGY

         "Patent Rights" shall include the following:
[TEXT OMITTED]


                                      -13-

<PAGE>


                                   APPENDIX B

                                  LICENSED NCES

[Text Omitted]


                                      -14-


                                                                           10(b)

                              SUB-LICENSE AGREEMENT

THIS  AGREEMENT  (the  "Sub-License  Agreement")  is  made  as of the 3rd day of
December,  1997 (the  "Sub-License  Agreement  Date"),  between  1266417 Ontario
Limited,  an  Ontario  corporation  with  offices  at 1285  Morningside  Avenue,
Scarborough,  Ontario,  M1B 3W2 (hereinafter  "NEWCO"),  and Ion Pharmaceuticals
Inc, an American  corporation  located at Suite 208,  124 Mount  Auburn  Street,
Cambridge MA 02138-5700  (hereinafter "ION"), being a subsidiary wholly owned by
Sheffield Pharmaceuticals, Inc. (hereinafter "SHEFFIELD").

                  WHEREAS:

         A. ION is a  co-owner  (together  with the  President  and  Fellows  of
Harvard  College  (hereinafter  "HARVARD")  and the  Children's  Medical  Center
Corporation  (hereinafter  "CMCC"))  of the  Patent  Rights  (as  defined in the
Assignment and License  Agreement dated December 3, 1997 between ION and NEWCO,)
(the "Assignment and License Agreement").

         B. NEWCO, a newly formed  Ontario  subsidiary of Imutec Pharma Inc., is
acquiring ION's ownership  interest in all Patent Rights in exchange for certain
payments and a license to certain NCEs, as defined in the Assignment and License
Agreement.

         C. ION is party (the Licensee) to a License Agreement (hereinafter "the
HARVARD/ION License  Agreement"),  originally dated August 22, 1994 and modified
June 21,  1995,  August 22, 1996 and  December 2, 1997,  between ION and HARVARD
which  grants ION  certain  rights in the  Harvard  Patent  Rights as defined in
Paragraph 1.1 herein.


<PAGE>
         D. NEWCO wishes to obtain a sub-license  under the HARVARD/ION  License
Agreement,  and ION is able to and wishes to grant the same to NEWCO in exchange
for the payments described in this Sub-License Agreement.

                  NOW,  THEREFORE,  in  consideration  of the  mutual  covenants
herein  contained  and  intending  to be  legally  bound  NEWCO and ION agree as
follows:
                                       I.
                                   DEFINITIONS

         As used herein, the following phrases,  whether used in the singular or
plural, shall have the following meanings:

         1.1 "Harvard  Patent  Rights" shall mean:  [Text Omitted] and any other
United  States patent  application,  including  any  division,  continuation  or
continuation-in-part,  thereof and any foreign patent  application or equivalent
corresponding  thereto  and any  United  States  or  foreign  Letters  Patent or
equivalent  thereof  issuing  thereon or reissue or  extension  thereof,  to the
extent it claims an invention  made in the  performance  of research  previously
sponsored  by ION  and to the  extent  that  HARVARD  is  able  to  grant a full
exclusive license as is granted in the HARVARD/ION License Agreement and in this
Sub-License Agreement.

         1.2 "Technology" shall mean all patentable and unpatentable technology,
know-how,  trade  secrets and all other  information  in ION's custody and under
ION's control relating to the Harvard

                                       -2-

<PAGE>
Patent Rights, excluding any such technology described in Paragraph 2.4 herein.

         1.3  "Sublicensed  Technology"  shall mean  Harvard  Patent  Rights and
Technology.

         1.4  "Sublicensed  Product(s)"  shall mean any  compounds,  substances,
pharmaceutical,  diagnostic  kits and/or  components or  manifestations  thereof
which incorporate or utilize the Sublicensed Technology in the Field of Use.
         1.5 "Field of Use" shall mean in the diagnosis and treatment of cancer,
actinic keratosis and Kaposi's Sarcoma.

         1.6 "NCE's" shall mean the compounds encompassed in the Patent Rights.

         1.7 "Lead Compounds" shall mean those compounds which have demonstrated
[Text Omitted] as determined and selected by NEWCO from the NCE's.

         1.8  "Affiliate"  shall mean any  business  entity  that,  directly  or
indirectly,  de jure or de facto, controls, is controlled by, or is under common
control with NEWCO.  The meaning of the word "control"  shall  include,  without
limitation, direct or indirect ownership of more than fifty percent (50%) of the
voting  shares  of such  corporation  or fifty  percent  (50%) of the  ownership
interests in such other business equity.

                                       II.
                                  LICENSE GRANT

         2.1 ION  hereby  grants  to NEWCO an  exclusive,  worldwide  right  and
license under the Harvard Patent Rights, to make, have

                                       -3-

<PAGE>
made, use, market, sell, or otherwise  commercialize  products using the Harvard
Patent Rights in the Field of Use, subject only to the license granted to ION in
the Assignment and License Agreement.

         2.2 ION hereby  grants to NEWCO a  non-exclusive,  worldwide  right and
license under the Technology to make, have made, use, market, sell, or otherwise
commercialize  the  Technology in the Field of Use,  subject only to the license
granted to ION in the Assignment and License Agreement.  ION agrees not to grant
any third party similar rights in the Field of Use.

         2.3 ION  grants to NEWCO,  a  worldwide  right  and  license  under the
Sublicensed  Technology to grant exclusive sub-licenses under the Harvard Patent
Rights and to grant  non-exclusive  sub- licenses  under the Technology to make,
have made,  use,  market,  sell,  or  otherwise  commercialize  the  Sublicensed
Technology,  subject only to the license  granted to ION in the  Assignment  and
License Agreement.  NEWCO shall provide ION with a copy of each such sub-license
after execution thereof.

         2.4 The licenses granted hereunder shall not be construed to confer any
rights upon NEWCO by  implication,  estoppel,  or otherwise as to any technology
not specifically  encompassed by the term Sublicensed  Technology.  It is agreed
and understood that the licenses granted  hereunder do not confer any right upon
NEWCO to any  technology  owned or controlled by Pharm-Eco  Laboratories,  Inc.,
including  but  not  limited  to  any  technology  relating  to the  methods  of
manufacturing the NCE's, and that may be known to ION.

                                       -4-

<PAGE>
         2.5 The  granting  and  acceptance  of this  Sub-License  Agreement  is
subject to the  following in the event the  Sublicensed  Technology is funded in
part by  non-profit  or non-  commercial  sponsors of  research:  (i)  Harvard's
Statement of Policy in Regard to Inventions, Patents and Copyrights" dated March
17,  1986;  and (ii)  Public Law 96-517 and Public Law  98-620.  Nothing in this
Sub-License  Agreement shall prevent Harvard or the Principal  Investigator from
seeking  additional  funding,  however,  in no event  shall any rights  under an
agreement with  non-profit or  non-commercial  sponsors of research  conflict or
affect in any way the right and license  granted  hereunder to NEWCO by ION. Any
right granted in this Sub-License  Agreement greater than permitted under Public
Law 96-517 or Public Law 98- 620 shall be  subject  to  modifications  as may be
required to conform to the provisions of that statute.

         2.6 NEWCO agrees that HARVARD  retains the right to make and to use the
Sublicensed  Technology  for research  purposes only and not for any  commercial
purpose.  In the  event  HARVARD  wishes to  transfer  any  materials  under the
Sublicensed  Technology  to a third  party  research  institution  for  research
purposes  only,  the name and  address  of such  scientists  and  not-for-profit
institutions shall be promptly provided to NEWCO.

                                      III.
                                     EFFORTS

         3.1 NEWCO  shall use  reasonable  efforts  to  effect  introduction  of
Sublicensed Products into the commercial market

                                       -5-

<PAGE>
as soon as practicable,  consistent with sound and reasonable business practices
and judgment;  thereafter,  until the expiration of this Sub-License  Agreement,
NEWCO shall endeavor to keep Sublicensed  Products  reasonably  available to the
public.

         3.2 NEWCO shall  provide to ION written  annual  reports  within thirty
(30) days after June 30 of each  calendar  year which  shall  include but not be
limited  to:  reports  of  progress  on  research  and  development,  regulatory
approvals,  manufacturing,   sub-licensing,   marketing  and  sales  during  the
preceding  twelve (12) months as well as plans for the coming year.  If progress
differs from that  anticipated  in the plan  provided,  NEWCO shall  explain the
differences and propose a modified plan for ION's review. If ION is dissatisfied
with the  modified  plan,  both  parties  shall meet to develop a plan  mutually
agreed upon.  NEWCO shall also provide any reasonable  additional  data that ION
requires to evaluate  NEWCO's  compliance  under this  Paragraph.  ION agrees to
maintain as  confidential  all  information  designated as confidential by NEWCO
which is  provided  to ION under  this  Paragraph.  ION  agrees  not to use such
confidential  information  for any purposes other than the evaluation of NEWCO's
compliance  under this Paragraph and agrees not to disclose such  information to
anyone  who is not a direct  employee  of ION,  HARVARD's  Office of  Technology
Licensing or anyone who has not signed a  nondisclosure  agreement each of which
shall be acceptable to NEWCO covering the  confidential  information.  Copies of
such

                                       -6-

<PAGE>

nondisclosure agreements shall be provided to NEWCO promptly after execution.

         3.3 NEWCO  shall  fund the  ongoing  research  and  development  of the
Sublicensed Technology substantially in accordance with the development plan. At
its expense,  NEWCO shall use best efforts to obtain regulatory approval for the
marketing,  sale and use of one or more  products  derived from the  Sublicensed
Technology at the earliest possible date in the [Text Omitted].

         3.4 ION shall have the right at its sole  discretion  to  terminate  or
render  this  Sub-License  Agreement  non-exclusive  if NEWCO is not  engaged in
research,  development,   clinical  trials,  product  approval,   manufacturing,
marketing or licensing of any of the Sublicensed  Technology.  Prior to invoking
the right to terminate or render this Sub-License Agreement  non-exclusive,  ION
shall give written  notice to NEWCO and a seventy-five  (75) day  opportunity to
NEWCO to demonstrate  that it is using  reasonable  efforts to comply under this
Paragraph. If after the seventy-five (75) day period, NEWCO fails to demonstrate
such  compliance,  ION may  notify  NEWCO of its intent to either  terminate  or
render this Sub-license Agreement non-exclusive.

                                       IV.
                                PAYMENTS BY NEWCO

         4.1 In  consideration  for  this  Sub-License  Agreement,  NEWCO or its
sublicensees or Affiliates will pay up to $2,500,000 U.S.
to ION as follows:

                                       -7-

<PAGE>
         a) $[Text Omitted] U.S. to be paid in two equal installments, the first
installment to be paid upon the execution of this Sub-License Agreement, and the
second installment to be paid before [Text Omitted];

         b) $[Text Omitted] U.S. milestone payment prior to initiating the first
Phase II trial with the first of any Sublicensed  Product but not later than one
hundred and eighty (180) days of completion of the treatment of the last subject
in the first Phase I trial;

         c) $[Text Omitted] U.S. milestone payment prior to initiating the first
Phase III trial with the first of any Sublicensed Product but not later than one
hundred and eighty  (180) days of  completion  of the last  subject in the first
Phase II trial;

         d) $[Text  Omitted] U.S.  milestone  payment due within one hundred and
eighty (180) days of completion of the treatment of the last subject in the last
pivotal Phase III trial for the first Sublicensed Product;

         e) $[Text Omitted] U.S. final milestone payment within thirty (30) days
of the receipt of product marketing approval in the [Text Omitted] for the first
Sublicensed Product. For further clarification, in the event any of the clinical
trials  for which  payments  described  above are due ION by NEWCO and which are
multi-phased,  then  the  payment  due ION  shall  be made  for  each  milestone
described above addressed by such multi- phased trial (i.e., if there is a Phase
II/III trial, which is

                                       -8-

<PAGE>
the first in both Phase II and Phase III, then ION receives  $[Text  Omitted] in
satisfaction of milestone payments described in (b) and (c) above).

                                       V.
                         REPORTS, RECORDS AND INSPECTION

         5.1 NEWCO shall  maintain a true and correct set of records  pertaining
to its  performance  under  this  Sub-License  Agreement  for a period  of [Text
Omitted]  after the  termination  or expiration of this  Sub-License  Agreement.
NEWCO agrees to permit an auditor  selected by ION and reasonably  acceptable to
NEWCO to have access,  during the term of this  Sub-License  Agreement and for a
period of two years  thereafter,  and during  ordinary  business  hours, to such
records as may be necessary,  in the opinion of such  auditor,  to determine the
correctness of any report and/or payment made under this Sub-License Agreement.

                                       VI.
                            PATENTS AND INFRINGEMENT

         6.1(a)  NEWCO shall  continue at NEWCO's  expense,  except as otherwise
provided  herein,  the  efforts of HARVARD  and/or  ION  commenced  prior to the
Sub-License Agreement Date to obtain patents (or reissues, renewals,  divisions,
extensions or  continuations  thereof) on the  applications in the United States
and on any issued patents and patent  applications in such foreign  countries as
are the subject of foreign counterpart  prosecution on the Sub-License Agreement
Date.  NEWCO  and ION may  jointly  elect to file and  obtain  patent  and other
suitable forms of

                                       -9-

<PAGE>
protection of the Sublicensed Technology in any country at NEWCO's expense.

         (b) In the event  that NEWCO  elects not to pay or to cease  paying for
prosecution  and  maintenance  associated with any of the Harvard Patent Rights,
then such patent,  patent application,  or patent issuing therefrom shall not be
included as part of the  sub-license  rights  granted to NEWCO  pursuant to this
Sub-License  Agreement and NEWCO shall assign its ownership interest in any such
patent or patent  application  in Patent Rights to ION.  NEWCO agrees to execute
whatever  formal  assignment  documents  are  required  to assign such patent or
patent  application  in Patent Rights back to ION. In the event that NEWCO fails
to pay for prosecution  costs  associated with activities that have been jointly
agreed to in Paragraph 6.1 of this Sub-License  Agreement,  ION may within seven
days written  notice to NEWCO,  pay the amounts and NEWCO shall be liable to pay
ION for the prosecution  costs. In the event NEWCO fails to provide  evidence to
ION of payment of maintenance  costs  associated  with any of the Harvard Patent
Rights which have been jointly  agreed to in Paragraph  6.1 of this  Sub-license
Agreement  prior  to  sixty  (60)  days in  advance  of a  deadline  upon  which
intellectual  property rights would be irretrievably  lost, ION may within seven
(7) days written  notice to NEWCO,  pay the amounts and NEWCO shall be liable to
pay ION for the maintenance costs.

         (c) The decision  with regard to  selection  of patent  counsel and any
decisions with respect to filing, prosecution, issuance

                                      -10-

<PAGE>
and  maintenance  of  any  patent  applications  and  patents  relating  to  the
Sublicensed  Technology  shall be made jointly by NEWCO and ION.  Both NEWCO and
ION must simultaneously  receive copies of all  correspondence,  draft responses
and filings for each party's review and approval.

         (d) ION shall cooperate fully with NEWCO,  and shall endeavor to secure
the cooperation of HARVARD in preparation, filing, and prosecution of all United
States and foreign  patent  applications  filed  pursuant to this paragraph 6.1,
which  cooperation  shall include,  but not be limited to, execution by HARVARD,
ION, HARVARD's faculty, and all employees of both HARVARD and ION of any and all
such  papers  and  instruments  as are  necessary  or  helpful  to  NEWCO or its
sub-licensees  in  preparing,   filing,   and  prosecuting  all  foreign  patent
applications.

         6.2 If it is believed in good faith that patent rights are infringed by
a third party, the party to this Sub-License Agreement first having knowledge of
such infringement shall promptly notify the other in writing, which notice shall
set forth the facts of such infringement in reasonable detail.  NEWCO shall have
the right, but not the obligation, to institute and prosecute at its own expense
any such  infringement  of the patent rights provided that NEWCO shall not enter
into any  settlement  agreement or consent  judgment  without the prior  written
consent of ION, which shall not be unreasonably withheld. If ION is deemed to be
an indispensable party, ION agrees to be named as a co-Plaintiff.  If HARVARD is
deemed to be an indispensable party,

                                      -11-

<PAGE>
then  ION  shall  endeavor  to  secure  HARVARD's   agreement  to  be  named  as
co-Plaintiff. If NEWCO fails to bring such action or proceedings within a period
of three (3) months after receiving written notice or otherwise having knowledge
of the  infringement  or  within  such time that it  intends  not to bring  such
action,  then ION shall have the right, but not the obligation,  to prosecute at
their  own  expense  any  infringement  of  the  patent  rights.  Recoveries  or
reimbursements  from such action shall first be applied to  reimburse  NEWCO and
ION for litigation costs. Any remaining  recoveries or  reimbursements  shall be
shared  equally by NEWCO and ION,  after  payment of any  amounts due to HARVARD
pursuant  to  the  HARVARD/ION  License  Agreement.  A  party  choosing  not  to
participate in any such action or proceeding  shall, at the request of the other
party,   make  its  employees   available  to  testify,   and  produce  relevant
non-privileged records, papers,  information,  samples, specimens, and the like.
NEWCO  shall  reimburse  ION for any costs ION and  Harvard  incur as part of an
action  brought by NEWCO or its  sublicensees  or  Affiliates,  irrespective  of
whether  ION  or  HARVARD  become  co-plaintiffs.   If  HARVARD  elects  not  to
participate,  ION  shall  endeavor  to  secure  HARVARD's  consent  to make  its
employees  available to testify,  and produce relevant  non-privileged  records,
papers, information, samples, specimens, and the like.

         6.3 NEWCO shall  defend,  indemnify  and hold  harmless ION and HARVARD
with respect to costs of defense and any and all liabilities  resulting from any
suits, countersuits or legal

                                      -12-

<PAGE>
actions of any nature that may be asserted against ION or HARVARD in response to
the filing of an action by NEWCO  pursuant to Paragraph  6.2 or as the result of
the  filing of an action  against  NEWCO by a third  party.  ION  shall,  at the
request  and  expense of NEWCO,  cooperate  with  NEWCO in any such third  party
action by making its employees  available to testify and by producing  relevant,
non-privileged records, papers,  information,  samples, specimens, and the like,
and ION shall  endeavor to obtain the same  cooperation  from HARVARD,  if NEWCO
deems it necessary.

                                      VII.
                                  SUB-LICENSEES

         7.1 NEWCO shall not grant any rights  which are  inconsistent  with the
rights  and  obligations  of  NEWCO  hereunder.  NEWCO  shall  give  ION  prompt
notification  of the  identity  and  address of each  sub-licensee  with whom it
concludes a sub-  licensing  agreement  and shall supply ION with a copy of such
sub- licensing agreement upon request. Any sub-licensing agreement shall include
an audit right by HARVARD of the same scope as provided by Paragraph  5.1 hereof
with respect to ION. No such sub-licensing agreement shall contain any provision
which would cause it to extend beyond the term of this Sub-License Agreement.

         In the event that the HARVARD/ION License Agreement  terminates for any
reason during the term of the ION/NEWCO Sub- License Agreement,  or in the event
that ION and SHEFFIELD become involved in insolvency, dissolution, bankruptcy or
receivership proceedings affecting the operation of their respective

                                      -13-

<PAGE>
businesses,  or in the event that ION and SHEFFIELD discontinue their businesses
for any  reason,  then ION shall  assign all of ION's  rights to HARVARD in this
Sub-License   Agreement,   and   HARVARD   shall   assume   ION's   rights   and
responsibilities  under the ION/NEWCO Sub-License  Agreement,  provided that (i)
NEWCO  is not in  default  of any of  its  obligations  under  this  Sub-License
Agreement,  (ii) NEWCO assumes all  responsibility  for the payment of all costs
associated with the filing,  prosecution and maintenance of the Licensed Patents
(as defined in the HARVARD/ION  License  Agreement) which form part of this Sub-
License  Agreement  (iii) HARVARD  would not be obligated to any greater  extent
than it is to ION under the HARVARD/ION License Agreement and (iv) HARVARD shall
not  receive  any rights  beyond the rights  granted by HARVARD to ION under the
HARVARD/ION License Agreement.

         7.2 All  sub-licenses  granted  by  NEWCO  hereunder  shall  include  a
requirement  that the  sub-licensee  use its  reasonable  efforts  to bring  the
subject  matter  of  the  sub-license  into  commercial  use  as  quickly  as is
reasonably possible.

                                      VIII.
                         REPRESENTATIONS AND WARRANTIES

         8.1 ION hereby  represents  and warrants  that ION holds,  by way of an
exclusive,  world-wide  license from  HARVARD,  all rights in and to the Harvard
Patent  Rights,  and that ION is able to grant the  license  granted to NEWCO in
this Sub-License Agreement.

                                      -14-

<PAGE>
ION further warrants that as of the date of this Sub-License Agreement,  ION has
not licensed the Sublicensed Technology to any party other than NEWCO.

         8.2 ION  hereby  represents  that as of the date of this  Sub-  License
Agreement,  neither the United States  Government nor any third party has any of
the rights in and to the Sublicensed Technology granted to NEWCO.

         8.3 Neither ION,  HARVARD or any of their faculty  members,  directors,
trustees,  employees,  or agents assume any  responsibility for the manufacture,
product  specifications,  or use or administration of the Sublicensed Technology
or the Sublicensed Products which are manufactured by or for or sold by NEWCO or
by any of its Affiliates or sublicensees.  All warranties in connection with the
Sublicensed  Technology or  Sublicensed  Products shall be made by NEWCO (or the
particular  NEWCO Affiliate or licensee or sublicensee  that is involved) as the
manufacturer,  seller,  or  administrator  thereof,  and none of such warranties
shall  directly or by  implication  in any way obligate  ION,  HARVARD or any of
their faculty members, researchers,  directors, trustees, officer, employees, or
agents.

         8.4 ION MAKES NO WARRANTIES OR  REPRESENTATIONS,  EXPRESSED OR IMPLIED,
INCLUDING,  BUT NOT  LIMITED  TO,  WARRANTIES  OF  FITNESS  OR  MERCHANTABILITY,
REGARDING  THE  SUBLICENSED  PRODUCTS OR  SUBLICENSED  TECHNOLOGY.  ION DOES NOT
WARRANT THE VALIDITY OF THE PATENTS  LICENSED UNDER THIS  SUB-LICENSE  AGREEMENT
AND MAKES NO REPRESENTATION OF ANY KIND REGARDING THE SCOPE OF SUCH PATENTS OR

                                      -15-

<PAGE>
THAT ANY OF THE  SUBLICENSED  TECHNOLOGY  CAN BE PRACTICED OR EXPLOITED  WITHOUT
INFRINGING OTHER PATENTS.

         8.5  The  execution,   delivery  and   performance  by  NEWCO  of  this
Sub-License  Agreement  do not  contravene  or  constitute  a default  under any
provision of applicable law or of any agreement,  judgment,  injunction,  order,
decree or other instrument binding upon NEWCO.

                                       IX
                            WAIVER AND MODIFICATIONS

         9.1 It is understood  that this  Sub-License  Agreement its Appendices,
and the Assignment and License  Agreement and its Appendices  contain the entire
agreement  between the  parties  relating to the  licensing  of the  Sublicensed
Technology.  Neither  party  shall  be  bound  by any  agreement,  covenants  or
warranties  made by its agents or employees,  or any other persons,  unless such
agreements,  covenants and warranties  shall be reduced to writing and signed by
an officer of each  party.  The  failure of either of the parties at any time or
times to require  performance by the other of any provisions  hereof shall in no
manner affect the right of the first mentioned  party  thereafter to enforce the
same.

         9.2 The waiver by either parties of any breach of any provision  hereof
shall  never  be  construed  to be a waiver  of any  succeeding  breach  of such
provision or a waiver of the provision itself.



                                      -16-

<PAGE>
                                       X.

                                   TERMINATION

         10.1  Unless   terminated   earlier  as  hereinafter   provided,   this
Sub-License  Agreement  shall extend for the later of the last to expire  patent
encompassed  in the  definition  of the Harvard  Patent Rights or payment of the
final payment described in Paragraph 4.1, and shall then expire automatically.

         10.2 ION may terminate this Sub-License  Agreement with a seven (7) day
written  notice to NEWCO for NEWCO's  failure to make payments when due pursuant
to  Paragraph  4.1,  provided  such breach is not cured within the seven (7) day
notice  period.  In the event of  termination  for NEWCO's breach of any payment
due,  hereunder,  NEWCO shall assign its ownership interest in any Patent Rights
to ION pursuant to the terms and  conditions of Paragraphs  9.01 and 2.03 of the
Assignment and License Agreement.

         10.3 Except as otherwise provided in Paragraph 10.2 above, in the event
of failure by either party to perform any of the terms, covenants, or provisions
of this Sub-License  Agreement,  the non-performing  party shall have forty-five
(45) days after giving the written  notice of such default by the other party to
correct  such  failure.  If  such  failure  is not  corrected  within  the  said
forty-five (45) day period after notice as aforesaid, the performing party shall
have the right, at its option,  to cancel and terminate this entire  Sub-License
Agreement.  Either  party  shall have the right,  at its  option,  to cancel and
terminate this entire  Sub-License  Agreement in the event the other party shall
become involved in insolvency, dissolution, bankruptcy or

                                      -17-

<PAGE>

receivership  affecting  the  operation of its business or in the event that the
other party shall discontinue its business for any reason.

         10.4 In the event of termination of this  Sub-License  Agreement except
pursuant to Paragraph  10.1, all rights licensed by ION to NEWCO hereunder shall
revert to ION.

         10.5 NEWCO may terminate this Sub-License Agreement,  at any time, with
or without cause, by giving ION ninety (90) days prior written notice.

         10.6 No termination of this  Sub-License  Agreement shall  constitute a
termination or a waiver of any rights of either party against the other accruing
at or prior to the time of such termination.

         10.7     [Text Omitted]

                                       XI.
                                  ASSIGNABILITY

11.1 This  Sub-License  Agreement  shall be binding  upon and shall inure to the
benefit of ION and its assigns and successors in interest,  and shall be binding
upon and shall  inure to the  benefit of NEWCO and the  successor  to its entire
business,  and shall be  assignable  by NEWCO to NEWCO  Affiliates or to HARVARD
pursuant to Paragraph 7.1 herein;  however, the Sub-License  Agreement shall not
otherwise be assignable  or assigned by either party  without prior  approval by
the other party being first  obtained in writing,  which  approval  shall not be
unreasonably withheld.

                                      -18-

<PAGE>
                                      XII.
                                       LAW

         12.1 This  Sub-License  Agreement shall be interpreted and construed in
accordance  with the  Commonwealth  of  Massachusetts.  Anything  herein  to the
contrary notwithstanding, where interpretation of a patent or patent application
is involved,  this  Sub-License  Agreement is made  specifically  subject to the
patent  legislation of the  jurisdiction  in which any such patent is granted or
patent application filed.

                                      XIII.
                                    ADDRESSES

         13.1 For the  purpose  of reports  and  notices  herein set forth,  the
addresses set forth in the introductory  paragraph of this Sub-License Agreement
shall be used unless changed by written notification to the other party.

                                      XIV.
                                    INSURANCE

         14.1 (a) During the period of time in which  research or development is
conducted on NEWCO's premises or premises under the exclusive  control of NEWCO,
and during the period of time in which any clinical  trials are being  conducted
for Sublicensed Products,  NEWCO shall at is sole cost and expense,  procure and
maintain  policies  of  comprehensive   general  liability   insurance  with  an
internationally recognized carrier in amounts not less

                                      -19-

<PAGE>
than $[Text Omitted]  Canadian per incident and $[Text Omitted]  Canadian annual
aggregate.  Such  insurance  policies  shall  name  each of ION and  HARVARD  as
additional  insured  parties with the same scope of coverage  for each  coverage
required for NEWCO.

                  (b) NEWCO  shall  provide  ION with  written  evidence of such
insurance upon request of ION. NEWCO shall provide ION with written notice of at
least  fifteen  (15) days prior to the  cancellation,  non-renewal  or  material
change  in such  insurance;  if NEWCO  does  not  obtain  replacement  insurance
providing  comparable coverage within a sixty (60) day period after cancellation
or non-renewal  effective as of the date of such non-renewal or material change,
and, if NEWCO is unable to  reasonably  demonstrate  that the net worth of NEWCO
and its  Affiliates  is such that it is  self-insured  to the amounts  specified
above, ION may within seven days written notice to NEWCO, obtain insurance which
meets the  requirements of this Paragraph for the benefit of ION and HARVARD and
NEWCO shall be liable to pay all costs associated with such insurance.

         14.2 (a) At such time as any  Sublicensed  Product,  process or service
related to, or  developed  pursuant  to,  this  Sub-License  Agreement  is being
commercially  distributed  or sold  (other than for the  purposes  of  obtaining
regulatory  approvals) by NEWCO or by a sublicensee or Affiliate of NEWCO, NEWCO
shall procure and maintain policies of comprehensive general liability insurance
in amounts  consistent with industry  standards but in no event less than $[Text
Omitted] Canadian per incident and $[Text

                                      -20-

<PAGE>

Omitted]  Canadian annual  aggregate and naming of ION and HARVARD as additional
insureds.  Such comprehensive  general liability  insurance shall (i) be with an
internationally recognized carrier, (ii) provide product liability coverage, and
(iii)   provide   broad  form   contractual   liability   coverage  for  NEWCO's
indemnification under Paragraph 15.2 of this Sub-License Agreement.  The minimum
amounts  of  insurance  coverage  required  under  this  Paragraph  shall not be
construed  to  create  a  limit  of  NEWCO's   liability  with  respect  to  its
indemnification under Paragraph 15.2 of this Sub-License Agreement.

                  (b) NEWCO  shall  provide  ION with  written  evidence of such
insurance  upon request of ION.  NEWCO shall provide ION with written  notice at
least  fifteen  (15) days prior to the  cancellation,  non-renewal,  or material
change in such insurance. Upon cancellation or non-renewal,  NEWCO shall use all
reasonable efforts to obtain replacement insurance providing comparable coverage
as soon as possible.  If NEWCO is unable to obtain comparable insurance within a
sixty (60) day period after such cancellation or non-renewal effective as of the
date of  such  non-renewal  or  material  change,  and if  NEWCO  is  unable  to
reasonably  demonstrate  that the net worth of NEWCO and its  Affiliates is such
that it is self-insured  to the amounts  specified  above,  ION may within seven
days written notice to NEWCO,  obtain  insurance which meets the requirements of
this  Paragraph  for the benefit of ION and HARVARD and NEWCO shall be liable to
pay all costs associated with such insurance.

                  (c) NEWCO shall  maintain  comprehensive  liability  insurance
described in Paragraph  14.2 (a) beyond the  expiration or  termination  of this
Sub-License  Agreement  during  (i) the  period  that any  Sublicensed  Product,
process or service,  relating  to, or developed  pursuant  to, this  Sub-License
Agreement is being commercially  distributed or sold (other than for the purpose
of obtaining regulatory  approvals) by NEWCO, a sublicensee,  Affiliate or agent
of NEWCO;  and (ii) a reasonable  period after the period referred to in (c) (i)
above, which in no event shall be less than fifteen years.

                                       XV.
                              ADDITIONAL PROVISIONS

         15.1 USE OF NAMES.  NEWCO  agrees  that it may not use in any way,  nor
permit any other party to use in any way, the names "ION", "Sheffield", "Harvard
College", "Harvard" or any logotypes

                                      -21-

<PAGE>
or  symbols  associated  with  HARVARD,  ION or  SHEFFIELD  or the  names of any
researchers at HARVARD  without the prior written consent of ION, in the case of
ION's and SHEFFIELD'S name and ION and HARVARD,  in the case of HARVARD's or any
researcher's names; EXCEPT THAT such obligation of NEWCO under this subparagraph
15.1  shall not  apply to  information  (i) that  NEWCO  determines  in its sole
discretion to be necessary and  appropriate  to satisfy its disclosure and other
obligations  under federal,  provincial or state law,  including but not limited
to,  the public  disclosures  of this  Sub-License  Agreement  pursuant  to such
securities  laws, or (ii) any and all data or research  work product  derived or
resulting from the Sublicensed Technology for the sole purpose of complying with
federal, state and provincial laws and regulatory requirements.

         15.2     INDEMNIFICATION.

                  (a) Each party shall  notify the other of any claim,  lawsuit,
or other proceeding related to the Sublicensed Products.  NEWCO shall indemnify,
defend and hold harmless ION and its officers,  employees,  directors and agents
and HARVARD, its trustees,  officers, medical and professional staff, employees,
students and agents, and ION's and HARVARD's  respective  successors,  heirs and
assigns  ("the  Indemnitees")  from and against  any and all  claims,  causes of
action, lawsuits, or other proceedings filed or otherwise instituted against the
Indemnitees  relating in any way to (i)  marketing,  commercialization  or other
rights granted under this Sub-License Agreement, (ii) injuries to

                                      -22-

<PAGE>
persons or damages which occur on NEWCO's  premises or premises under  exclusive
control of NEWCO, or (iii) any Sublicensed Product,  process or services used or
sold under this Sub-License Agreement;  by NEWCO or by a sublicensee,  Affiliate
or agent of NEWCO.

         (b) NEWCO's indemnification under (a) shall not apply to any liability,
damage,  loss or expense to the extent that it is  attributable to the negligent
activities,   deliberate  misrepresentations,   or  willful  misconduct  of  the
Indemnitees.

         (c) NEWCO agrees, at its own expense,  to provide attorneys  reasonably
acceptable to ION to investigate  and/or defend  against any actions  brought or
filed  against any party  indemnified  hereunder  with respect to the subject of
indemnity contained herein, whether or not such actions are rightly brought.

         15.3     RESOLUTION OF DISPUTES.

         a) In the  event  of a  dispute  or  disagreement  (hereinafter  called
"Dispute")  arises between the parties in connection with the  interpretation of
any provision of this  Sub-License  Agreement or the compliance or noncompliance
therewith,  or the validity or  enforceability  thereof,  or the  performance or
nonperformance  of either  party to the  Sub-License  Agreement,  the  following
Dispute resolution process shall be followed by the parties:

         (1) A Dispute  will be deemed to have  arisen  upon the  delivery  of a
written  notice by one party to the other  describing  the Dispute  (hereinafter
called the "Dispute  Notice").  Upon delivery of the Dispute Notice, the parties
agree to attempt to

                                      -23-

<PAGE>
resolve the Dispute in a prompt and  expeditious  manner,  through  negotiations
between ION and NEWCO representatives designated by each party to represent them
in said negotiations.  Except for the Dispute Notice, all communications between
the parties will be on a without prejudice basis.

         (2) If the  parties  have not been able to  resolve  the  Dispute  in a
prompt and  expeditious  manner  within  thirty (30) days after  delivery of the
Dispute  notice,  either  party may at any time  thereafter  request  by written
notice to the other party that the dispute be escalated to Senior Management.

         (3) In the event such a request with written notice is made, each party
shall  make  available  the  senior   executives   specified  in  the  following
subparagraph  ("Senior  Management") who shall meet within fifteen (15) business
days after such  request is made at the Offices of the party which  received the
request to attempt to resolve the Dispute.

         (4) The Senior Management appointee for each party is as follows:

                  NEWCO:            Corporate Secretary
                  ION:              Corporate Secretary

                  Either party may change its Senior  Management  appointee upon
prior written notice to the other party.

         b) In case such  Dispute is not settled  amicably by Senior  Management
within thirty (30) days of escalation to Senior  Management,  such dispute shall
be arbitrated  by an  Arbitration  Board acting in accordance  with the rules of
conciliation and

                                      -24-

<PAGE>
arbitration  of the  International  Chamber of Commerce in effect on the date of
the Dispute,  whose  decision  shall be final and binding upon the parties.  The
Arbitration  Board shall  consist of the person or persons  that the parties may
agree on and in default of  agreement  within  twenty  (20) days  following  the
expiration of the above-mentioned thirty (30) day period, each of the parties in
dispute shall  nominate one member to serve on the  Arbitration  Board and shall
give notice to the other party of the name of its nominee. If one party fails to
give this  notice  within  fifteen  (15) days after the other party has done so,
then the member  nominated by the other party shall  constitute the  Arbitration
Board.  If each party gives this  notice,  then the two members so  nominated by
agreement shall select a third member who shall be Chairman. If the original two
members are unable to agree upon a third  member  within  thirty (30) days after
the second notice has been given, the Court of Arbitration of the  International
Chamber of Commerce  shall appoint a third member of the  Arbitration  Board who
shall be unconditionally  accepted by both parties. The place of arbitration for
all Disputes shall be Boston, Massachusetts, U.S.A..

         The  arbitration  hearing shall  commence  within sixty (60) days after
appointment of the Arbitration  Board is done and shall be completed and a final
and  binding  award  rendered  in  writing  within  sixty  (60)  days  after the
completion  of the hearing  unless  circumstances  warrant  delay or the parties
agree to an extension.  The decision of the Arbitration  Board may be entered in
any

                                      -25-

<PAGE>
court of competent  jurisdiction and execution entered thereupon forthwith.  The
law specified in Paragraph 12.1 above shall apply.

         Each  party  shall  bear  the  cost  of  preparing  its own  case.  The
Arbitration  Board  shall have the right to include in the award the  prevailing
party's costs of  arbitration  and  reasonable  fees of attorneys,  accountants,
engineers and other professionals in connection with the arbitration.

         The  parties,  however,  will not be  required  to  arbitrate  and this
Paragraph  will not  apply to any  Dispute  relating  to  actual  or  threatened
unauthorized use or disclosure of confidential information or trade secrets.

         15.4 NO IMPLIED  RIGHTS.  No license or right is granted by implication
or otherwise  with respect to any patent  application  or patent owned by either
party hereto except as  specifically  set forth herein or in the  Assignment and
License Agreement.

         15.5  USE  AND  DISCLOSURE  OF  TECHNICAL  INFORMATION.   The  use  and
disclosure of the technical  information  acquired  pursuant to this Sub-License
Agreement  and  the  exercise  of the  Harvard  Patent  Rights  granted  by this
Sub-License  Agreement  shall be subject to the export,  assets,  and  financial
control  regulations  of the United  States of  America,  including  but without
limitation, restrictions under regulations of the U.S. that may be applicable to
direct or indirect re-exportation of such technical information or of equipment,
products,  or services directly  produced by use of such technical  information.
NEWCO is

                                      -26-

<PAGE>
responsible for taking any steps necessary to comply with such regulations.

         15.6 PRODUCT  LABELING.  NEWCO agrees to mark all Sublicensed  Products
sold in the United States with all applicable  patent  numbers.  All Sublicensed
Products  shipped to or sold in other countries shall be marked in such a manner
as to conform with the patent laws and  practices of the country of  manufacture
or sale.

         15.7  FRENCH  LANGUAGE.  NEWCO has  requested  that  this Sub-  License
Agreement  and all related  documents be drawn up in the English  language  with
which request ION agrees. NEWCO a demande que le present contrat ainsi que toute
la documentation  d'accompagnement soient rediges en anglais, requete a laquelle
ION consent.

         Executed as of the day and year first above written.

                                       1266417 ONTARIO LIMITED


                                       By: /s/ Philippe Lacaille
                                          -------------------------------
                                          Name:   Philippe Lacaille
                                          Title:  Chairman and President


                                       By: /s/ Kerri Golden
                                          -------------------------------
                                          Name:   Kerri Golden
                                          Title:  Chief Financial Officer and
                                                  Corporate Secretary



                                       ION PHARMACEUTICALS, INC.


                                       By: /s/ Thomas Fitzgerald
                                          -------------------------------
                                          Name:   Thomas Fitzgerald
                                          Title:   President



                                      -27-



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