Document:

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                                                                    EXHIBIT 10.1

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                        LICENSE AND DEVELOPMENT AGREEMENT

                                     BETWEEN

                           DUSA PHARMACEUTICALS, INC.

                          AND PHOTONAMIC GMBH & CO. KG

                                   DATED AS OF

                                DECEMBER 30, 2002

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                                TABLE OF CONTENTS

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<S>   <C>                                                         <C>
PRELIMINARY STATEMENTS                                             1

1     DEFINITIONS                                                  1

2     REPRESENTATIONS AND WARRANTIES                               5

3     JOINT DEVELOPMENT COMMITTEE                                  6

4     DEVELOPMENT PROGRAM                                          7

5     REGULATORY MATTERS                                           9

6     GRANT OF RIGHTS; OBLIGATIONS                                11

7     MILESTONES, ROYALTIES AND JOINT VENTURE                     12

8     PAYMENTS AND REPORTS                                        13

9     INTELLECTUAL PROPERTY                                       15

10    PUBLICATION; CONFIDENTIALITY                                17

11    INDEMNIFICATION                                             18

12    INSURANCE                                                   19

13    TERM; TERMINATION                                           20

14    FORCE MAJEURE                                               23

15    MISCELLANEOUS                                               23
</TABLE>

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                                LIST OF EXHIBITS

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EXHIBIT 1.8     THE COMPOUND

EXHIBIT 1.26    LICENSED TECHNOLOGY

EXHIBIT 5.4     DRUG SAFETY AGREEMENT
</TABLE>

                               LIST OF APPENDICES

APPENDIX A GENERAL DEVELOPMENT PLAN

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                        LICENSE AND DEVELOPMENT AGREEMENT

     THIS LICENSE AND DEVELOPMENT AGREEMENT (this "Agreement") dated as of
December 30, 2002, is entered into by and between DUSA Pharmaceuticals, Inc., a
corporation organized and existing under the laws of the State of New Jersey,
having offices at 25 Upton Drive, Wilmington, Massachusetts 01887 ("DUSA"), and
Photonamic GmbH & Co. KG, a corporation organized and existing under the laws of
the Republic of Germany, having offices located at Fehlandtstrasse 3, 20354
Hamburg, Germany ("PN").

PRELIMINARY STATEMENTS

     WHEREAS, PN owns, and/or has rights to certain pre-clinical and clinical
data, technology and know-how in existence as of the Effective Date relating to
the Compound and its use in the Field; and

     WHEREAS, DUSA has developed and owns, and/or has exclusive rights relating
to the Compound in the Territory; and

     WHEREAS, DUSA and PN desire to collaborate on the completion of the
development and commercialization of certain products using the Compound for
application in the Field; and

     WHEREAS, PN's Affiliate, medac GmbH ("medac"), and DUSA have entered into a
separate agreement of even date herewith (the "Supply Agreement") pursuant to
which medac will supply DUSA with [ * ] requirements of Product(s), all on the
terms and conditions set forth in such Supply Agreement; and

     WHEREAS, DUSA wishes to obtain, and PN desires to grant to DUSA, an [ * ]
license under the Licensed Technology to develop and commercialize the Products
in the Territory for medical applications in the Field, all on the terms and
conditions set forth below.

     NOW, THEREFORE, in consideration of the Preliminary Statements and the
mutual agreements and covenants set forth in this Agreement, the Parties agree
as follows:

1.   DEFINITIONS. As used in this Agreement, the following terms shall have the
meanings set forth in this Section 1 unless context dictates otherwise:

     1.1 "Additional Indication" shall mean, in each case, a use of the Product
outside the Field determined as set forth in Section 4.5, and the Barrett's
Indication, the development of which shall be undertaken by DUSA. For
clarification, Additional Indication is not meant to include "off-label" use of
the Product by end-users.

     1.2 "Affiliate" shall mean any entity controlling, controlled by, or under
common control with any Party. For these purposes, "control" shall refer to: (i)
the possession, directly or indirectly, of the power to direct the management or
policies of an entity, whether through the

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ownership of voting securities, by contract or otherwise, or (ii) the ownership,
directly or indirectly, of at least [ * ] percent ([ * ]%) of the voting
securities or other ownership interest of an entity.

     1.3 "Annual Development Plan" shall have the meaning assigned to such term
in Section 4.3.1.

     1.4 "Agreement Year" shall mean, in each instance, the twelve (12) month
period commencing as of the Effective Date or the anniversary date thereof.

     1.5 "Barrett's Indication" shall mean the use of photodynamic therapy for
the treatment of Barrett's esophagus, low grade dysplasia of the esophagus, and
high grade dysplasia of the esophagus.

     1.6 "Breaching Party" shall have the meaning assigned to such term in
Section 13.3.

     1.7 "cGMP" shall mean current Good Manufacturing Practice as defined in
Parts 210 and 211 of Title 21 of the U.S. Code of Federal Regulations, as may be
amended from time to time, or any successor thereto.

     1.8 "Compound" shall mean the chemical compound 5-aminolevulinic acid HCl,
as more particularly described on Exhibit 1.8 hereto.

     1.9 "Confidential Information" shall have the meaning assigned to such term
in Section 10.4.

     1.10 "Cost of Product" shall have the meaning assigned to such term in the
Supply Agreement.

     1.11 "Development Program" shall mean the development program with respect
to the Product, pursuant to the General Development Plan, as updated and amended
by the Annual Development Plans approved by the JDC, to obtain Registration of
the Product in each country in the Territory pursuant to Section 4.

     1.12 "Drug Master File" shall mean a drug master file, when filed by PN or
medac, as required under the United States Food Drug & Cosmetic Act, and under
the regulations promulgated thereunder, specifically 21 C.F.R. 314.420, et.
seq., and any successor regulations thereto, and any other Regulatory Authority.

     1.13 "Effective Date" shall mean the date of this Agreement stated above.

     1.14 "Executive Officers" shall mean the Chief Executive Officer of DUSA
and the Managing Director of PN, or such other person holding similar positions,
as may be designated by the applicable Party, from time to time.

     1.15 "FDA" shall mean the United States Food and Drug Administration, or
any successor thereto.

     1.16 "Field" shall mean fluorescence-guided resection of glioblastoma or
other brain cancers.

     1.17 "First Commercial Sale" shall mean, with respect to each Product, the
first sale for which payment has been received for use or consumption by the end
user of such Product in

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any country after all required Registrations have been granted, or such sale is
otherwise permitted, by the Regulatory Authority in such country, excluding
Samples, or other product provided at no cost to the end-user (i.e.,
compassionate use).

     1.18 "General Development Plan" shall mean the initial development plan set
forth in Appendix A for the development of the Product pursuant to the
Development Program, and as updated annually by the Annual Development Plans.

     1.19 "Generic Product" shall mean, on a country-by-country basis, any
bio-equivalent and/or bio-available product for use in the Field that contains
the Compound as an active ingredient that is marketed by a Third Party or
Parties following the expiration or invalidation of patent protection in such
country owned or licensed by DUSA.

     1.20 "IND" shall mean any filing made with the Regulatory Authority in any
country for initiating human clinical trials in such country, with respect to
the Product.

     1.21 "Indemnitee" shall have the meaning assigned to such term in Section
11.3.

     1.22 "Infringement" shall have the meaning assigned to such term in Section
9.3.1.

     1.23 "Invention" shall mean any new or useful process, manufacture,
compound or composition of matter relating to the Compound or a Product
(including, without limitation, the formulation, delivery or use thereof in the
Field), whether patentable or unpatentable, or any improvement thereof, that is
conceived or first reduced to practice or demonstrated to have utility during
the term of this Agreement.

     1.24 "Joint Development Committee" or "JDC" shall have the meaning assigned
to such term in Section 3.1.

     1.25 "Know-how" shall mean any and all Inventions, improvements,
discoveries, claims, formulae, processes, trade secrets, technologies and skill
(including confidential data and Confidential Information), whether patented or
unpatented, patentable or unpatentable, that is generated, owned or controlled
by PN at any time before or during the term of this Agreement relating to,
derived from, or useful for the manufacture, use or sale of the Compound or the
Product(s) in the Field in any country in the Territory, including, without
limitation, synthesis, preparation, recovery and purification processes and
techniques, control methods and assays, chemical data, toxicological and
pharmacological data and techniques, clinical data, medical uses, product
formulae and formulations, manufacturing processes and methods and
specifications.

     1.26 "Licensed Technology" shall mean the Know-how and all information
regarding PN's preclinical and clinical studies in the Field and all results
and/or data from such studies, and all IND or Registration Applications relating
thereto, generated, owned or controlled by PN at any time before or during the
term of this Agreement, as well as items inadvertently omitted from Exhibit 1.26
which may come to PN's attention from time to time. Licensed Technology is
identified on Exhibit 1.26.

     1.27 "Manufacturing Standards" shall mean, with respect to any Product,
cGMP and such additional manufacturing specifications or standards as may be
established by any Regulatory Authority from time to time, it being understood
that at the Effective Date, the FDA has not inspected medac's suppliers with
respect to their manufacture of the Product.

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     1.28 "NDA" shall mean a New Drug Application under the United States
Federal Food, Drug and Cosmetics Act and the regulations promulgated thereunder.

     1.29 "Net Sales" shall mean the [ * ]. Such amounts shall be determined
from the books and records maintained by a Party as applicable. All Net Sales
made by DUSA are sales in the Field unless DUSA receives approval for a
Registration outside the Field.

     1.30 "Non-breaching Party" shall have the meaning assigned to such term in
Section 13.3.

     1.31 "Party" shall mean DUSA or PN and, when used in the plural, shall mean
DUSA and PN.

     1.32 "Phase III Clinical Trial" shall mean PN's currently on-going
controlled studies in humans testing the efficacy and safety of the Product for
use in the Field in a manner sufficient to obtain FDA Registration of such
Product, a summary and description of which are set forth in the General
Development Plan.

     1.33 "Pre-NDA Meeting" shall mean, with respect to the use of the Product
in the Field, a meeting that takes place with the FDA in advance of filing the
Registration Application in the U.S. to confirm (i) the adequacy of the filing
data, and (ii) subject to the review of the data, that no further pre-clinical
or clinical studies are required in order to file.

     1.34 "Product" shall mean, individually or collectively, the [ * ]
formulation of the Compound currently in PN's clinical trials in the Field, any
[ * ] formulations of the Compound and/or the [ * ] formulation of the Compound
which has been tested by medac or which may be developed pursuant to the
Development Program, as appropriate in the context of the reference.

     1.35 "Registration" shall mean, with respect to each country, written
approval of the Registration Application for any Product filed in such country,
including pricing or reimbursement, where applicable, by the Regulatory
Authority in such country.

     1.36 "Registration Application" shall mean a NDA or a comparable filing for
Registration in a country , in each case with respect to a Product for
application in the Field.

     1.37 "Regulatory Authority" shall mean the FDA in the U.S., and any health
regulatory authority(ies) in any country that is a counterpart to the FDA and
holds responsibility for granting regulatory marketing approval for a Product in
such country, and any successor(s) thereto and any other state or local health
regulatory authorities having jurisdiction for any activities contemplated by
the Parties.

     1.38 "Samples" shall mean a supply of Product in its final formulation
ready for sale which is used as promotional material to encourage use and
provided to end-users or distributors at no cost to them.

     1.39 "Statistically Significant Results" shall mean the analysis of the
results of the Phase III Clinical Trial as required by a Regulatory Authority to
satisfy efficacy requirements; and in the case of the Product in the Field for
the FDA shall mean the analysis of the results using all patients in the Phase
III Clinical Trial, calculated by including and/or excluding the training
patients, and by measuring the recurrence rate of disease six months after the
resection procedure as a primary endpoint, all of which must yield statistical
significance by FDA standards.

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     1.40 "Sublicensee" shall mean a Third Party to which a Party has granted a
sublicense to develop, manufacture, use or sell a Product in any country,
pursuant to Section 6.1, 6.2, and 6.4.

     1.41 "Term" shall have the meaning assigned to such term in Section 13.1.

     1.42 "Territory" shall mean all the United States, [ * ]: provided that,
for each individual country, [ * ] at any time prior to or during the Term of
this Agreement.

     1.43 "Third Party" shall mean any person who or which is neither a Party
nor an Affiliate of a Party.

     1.44 "United States" or "U.S." shall mean the United States of America,
including its possessions and territories.

2.   REPRESENTATIONS AND WARRANTIES.

     2.1 Representations and Warranties of Both Parties. Each Party represents
and warrants to the other Party, as of the Effective Date, that:

          2.1.1 such Party is duly organized, validly existing and in good
standing under the laws of the jurisdiction of its incorporation and has full
corporate power and authority to enter into this Agreement and to carry out the
provisions hereof;

          2.1.2 such Party is free to enter into this Agreement;

          2.1.3 by entering into this Agreement, such Party will not violate any
other agreement to which it is a party; and

          2.1.4 such Party has taken all corporate action necessary to authorize
the execution and delivery of this Agreement and the performance of its
obligations under this Agreement.

     2.2 Representations and Warranties of PN. PN represents and warrants to
DUSA, as of the Effective Date, that:

          2.2.1 PN is the owner of, or has exclusive rights to, all the Licensed
Technology in existence on the Effective Date, and has the exclusive right to
grant the licenses granted under this Agreement, including, but not limited to
all Know-how generated, owned, or controlled by PN's predecessor and affiliate,
medac, GmbH, relating to the manufacture, use and sale of the Compound and the
Product in the Field;

          2.2.2 to the best of PN's knowledge, DUSA's commercialization of the
Licensed Technology using the Compound and/or the Product in the Field, in
accordance with the terms of this Agreement, [ * ] any patent or other
proprietary rights in the Territory of any Third Party;

          2.2.3 PN shall use commercially reasonable best efforts to perform its
obligations under this Agreement and shall perform the obligations assigned to
it under the Development Program in compliance with good laboratory and clinical
practices and cGMP, and in accordance with Section 4;

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          2.2.4 PN has not entered into any agreement with any Third Party that
grants the same or similar rights as are granted to DUSA pursuant to this
Agreement; and

          2.2.5 PN has filed with the health regulatory authorities in Germany
an amendment to its Phase III Clinical Trial protocol adding the recurrence rate
of disease six months after the resection procedure as a primary endpoint.

     2.3 Representations and Warranties of DUSA. DUSA represents and warrants to
PN, as of the Effective Date, that:

          2.3.1. DUSA is the exclusive licensee of Patent No. 5,422,093;

          2.3.2 DUSA shall use its commercially reasonable best efforts to
perform its obligations under this Agreement; and

          2.3.3. DUSA shall perform all its obligations in a manner commensurate
with professional standards generally applicable in its industry.

3.   JOINT DEVELOPMENT COMMITTEE.

     3.1 Members, Officers. The Parties shall establish a joint development
committee (the "Joint Development Committee" or "JDC"), which shall consist of
an equal number of members from each of DUSA and PN, the exact number of which
shall be as the Parties may agree, from time to time. Each Party shall select
and may replace any or all of its representatives on the JDC at any time upon
written notice to the other Party in accordance with Section 15.5.1 of this
Agreement. Any member of the JDC may call a meeting, designate a substitute to
attend and perform the functions of that member at any meeting of the JDC.

     3.2 Responsibilities. The JDC shall perform the following functions:

          3.2.1 review data and reports arising from and generated in connection
with PN's or its Affiliates' clinical trials in the Field, any proposed changes
to the oral formulation of the Product and the Development Program;

          3.2.2 review all studies relating to the Product(s) and any other
studies proposed to be performed in connection with the registration process for
the Product(s) under this Agreement;

          3.2.3 determine the scope, location, cost-sharing, timelines, and
protocols for pre-clinical and clinical studies which may be necessary for
Registration of the Product in the Field [ * ];

          3.2.4 decide no later than [ * ]

          3.2.5 provide a mechanism for the exchange of information between the
Parties with regard to the Know-how and Licensed Technology; and

          3.2.6 have such other responsibilities as may be assigned to the JDC
pursuant to this Agreement or as may be mutually agreed upon by the Parties from
time to time.

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     3.3 Meetings. During the term of the Development Program, the JDC shall
meet in person at least twice each calendar year, and more frequently as the
Parties deem appropriate, on such dates, and at such places and times, as the
Parties shall agree.

     3.4 Decision-making.

          3.4.1 Each Party shall have, collectively, one (1) vote in all
decisions.

          3.4.2 If, with respect to a matter that is subject to the JDC's
decision-making authority, the JDC cannot reach consensus within fifteen (15)
days after it has met and attempted to reach such consensus, the matter shall be
referred on the sixteenth (16th) day to the Executive Officers for resolution.
The Executive Officers shall use reasonable efforts to resolve the matters
referred to them. DUSA shall have the deciding vote with respect to matters
concerning the conduct of pre-clinical and clinical trials which it believes in
good faith are necessary to secure Regulatory Approval in the Territory;
provided however, that PN shall only be responsible for a maximum of [ * ] of
cost incurred for any pre-clinical or clinical studies which are approved by JDC
pursuant to this Section 3.4.2; and [ * ].

          3.4.3 For all purposes under this Agreement, any decision made
pursuant to Section 3.4.2 shall be deemed to be the decision of the JDC.

     3.5 Minutes. Definitive minutes of all JDC meetings shall be finalized no
later than thirty (30) days after the meeting to which the minutes pertain.

     3.6 Term. The JDC shall exist until the termination or expiration of the
Development Program and for such longer period as necessary to perform the
remaining responsibilities assigned to it under this Agreement.

     3.7 Expense. Each Party shall be responsible for all travel and related
costs and expenses for its members and approved invitees to attend meetings of,
and otherwise participate on, the JDC.

4.   DEVELOPMENT PROGRAM.

     4.1 Scope of the Development Program. The activities of the Development
Program shall begin on the Effective Date and shall include the research and
development activities of either or both of the Parties under this Agreement to
(i) finalize commercial development of [ * ] the Product, (ii) consider further
development [ * ] of the Product from the Compound, and (iii) such other
activities as necessary to implement the activities set forth in the General
Development Plan, as amended from time to time, and the Annual Development
Plans. Each Party, under the oversight of the JDC, shall manage the Development
Program in its area of responsibility. Except as otherwise expressly provided in
this Section 4, each Party shall bear the entire cost and expense it incurs in
connection with fulfillment of its obligations hereunder.

     4.2 General Development Plan. The General Development Plan has been
prepared and approved by the Parties and is annexed to and made part of this
Agreement as Appendix A. The General Development Plan outlines (i) all current
and planned clinical studies and/or protocols, (including, but not limited to
the amended protocol in the Field to add an endpoint measuring time to
recurrence of disease) for completion of the Phase III Clinical Trial, and (ii)
estimated timelines for completion of clinical and manufacturing tasks to be
undertaken to support the Registration of the Product, taking into consideration
the requirements of the FDA. The General Development Plan shall be updated
annually by incorporation of the Annual

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Development Plan(s) and may be further amended, at any time and from time to
time, as approved by the JDC.

     4.3 PN's Responsibilities under the Development Program. As part of the
Development Program, PN shall:

          4.3.1 at least [ * ] per Agreement Year, [ * ], prepare and submit to
the JDC for approval a report, including a revised timeline, of the development
and regulatory actions to be taken during the upcoming Agreement Year with
respect to the projects in its area of responsibility under the Development
Program, which shall include a description of the goals and scope of such
actions and the allocation of responsibilities, if any, to the respective
Parties (each, an "Annual Development Plan");

          4.3.2 use [ * ] efforts to conduct and complete [ * ], the currently
ongoing Phase III Clinical Trial for the Product in the Field as set forth in
the General Development Plan; and be responsible for up to the first [ * ] of
additional pre-clinical or clinical studies as determined by the JDC under the
terms and conditions stated in Section 3.2.3; [ * ];

          4.3.3 use [ * ] efforts to complete development, [ * ], of each
Product through [ * ], pursuant to the General Development Plan as updated by
applicable Annual Development Plan(s);

          4.3.4 facilitate discussions between DUSA and PN's or its Affiliates'
Product manufacturers and/or suppliers [ * ];

          4.3.5 maintain records, in sufficient detail and in good scientific
manner, which shall be complete and accurate and shall fully and properly
reflect all work performed and results achieved in connection with the
Development Program as required under all applicable Regulatory Authorities or
other laws and regulations. DUSA shall have the right, once per calendar year,
or more often as may be required to comply with any rule, regulation or other
requirement of a Regulatory Authority, during normal business hours and upon
reasonable notice, to inspect all such records. DUSA shall maintain such records
and information contained therein in confidence in accordance with Section 10
and shall not use such records or information except to the extent otherwise
permitted by this Agreement;

          4.3.6 within [ * ] days after the Effective Date, provide to DUSA
copies of reports of all pre-clinical studies and within [ * ] calendar days of
DUSA's request, which request may be made at any time thereafter, provide DUSA
with the raw data underlying such pre-clinical studies, and in accordance with
the timeline included in the General Development Plan as amended by the JDC
during the term of the Agreement, provide copies of clinical data and studies
and information, relating to the development of the Compound generated by or on
behalf of PN or its Affiliates (including primary and secondary pharmacology,
toxicology, formulation, and stability studies) and continue to provide to DUSA
copies of all such data and information relating to the development of the
Product, as well as any post-commercialization data regarding the Product, that
comes into PN's or its Affiliates' possession and control during the term of
this Agreement as required for compliance with DUSA's regulatory reporting
requirements; and

          4.3.7 within [ * ] after the end of each [ * ] during a calendar year
during the term of the Development Program, furnish the JDC with reasonably
detailed, written reports on all activities conducted by PN in the Field during
such period in connection with the

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development and commercialization of all products that contain the Compound as
an active ingredient.

     4.4 DUSA's Responsibilities under the Development Program. As part of the
Development Program, DUSA shall:

          4.4.1 at least [ * ] per Agreement Year, not later than [ * ], review
and comment upon the Annual Development Plan to be submitted to the JDC;

          4.4.2 promptly following the Effective Date, DUSA will provide PN, for
its regulatory use, with the results of a [ * ] study of clinical history in
patients [ * ]; and

          4.4.3 within [ * ] after the end of each [ * ] during a calendar year
during the term of the Development Program, furnish the JDC with reasonably
detailed, written reports on all activities conducted by DUSA in the Field
during such period in connection with the development and commercialization of
all products that contain the Compound as an active ingredient.

     4.5 Additional Development Efforts. The Parties recognize that each may
conduct research from time to time, outside the Development Program, resulting
in the discovery that the Product demonstrates utility for an Additional
Indication. The Parties may from time to time (but are not required to) and each
in its sole discretion, propose any such Additional Indication(s) for
development by the Parties within the Development Program, by submitting a
reasonably detailed report to the other Party. If the Parties determine that
such Additional Indication should be developed in the Development Program, the
Parties shall negotiate, in good faith, a budget and plan for development of
such Additional Indication(s). If within [ * ] days the Parties agree on a
budget for such development, the Additional Indication shall be included in this
Agreement [ * ] by either Party. If however the Parties are not able to reach
agreement on a budget and plan (including dispute resolution procedures) within
said [ * ] day time frame, the Additional Indication shall not be developed as
part of the Development Program and the proposing Party shall be free to
continue to develop the Product, as it chooses, for use in such Additional
Indication(s).

          4.5.1 Regardless of whether the Parties decide to include such
Additional Indication in the Development Program, PN shall notify and cause its
Affiliate, medac to, prior to the expiration of the [ * ] day time frame, advise
DUSA, in writing, whether or not medac will agree to supply Product to DUSA for
its development and commercial needs of any Additional Indication consistent
with the provisions of the Supply Agreement. medac acknowledges that it has
agreed to supply DUSA with Product for the Barrett's Indication.

     4.6 Liability. Each Party shall be responsible for, and hereby assumes, any
and all risks of personal injury or property damage attributable to the
negligent or willful acts or omissions, during the term of the Development
Program, of such Party or its Affiliates, and their respective directors,
officers, employees and agents.

     4.7 Disclaimer. [ * ]

5.   REGULATORY MATTERS.

     5.1 Regulatory Filings. DUSA shall, as may be appropriate, in its sole
discretion, prepare and file any and all INDs, Registration Applications and
other regulatory filings for the Products in each country in the Territory
through and including Registration, and, thereafter shall

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

be responsible for maintaining such Registrations. Any such filings shall be in
DUSA's name and expense (or that of its Affiliates, Sublicensees or
distributors, as the case may be). DUSA shall also be responsible for obtaining
any export approvals required by the Regulatory Authorities to export Products
among the countries of the Territory.

     5.2 Ownership. DUSA or, where required by applicable law, its designees(s)
shall own any and all INDs, Registration Applications, Registrations and other
regulatory filings for the Product in each country in the Territory.

          5.2.1 On a semi-annual basis, DUSA shall keep PN informed as to the
status of all regulatory filings made pursuant to Section 5.1 and shall provide
PN with copies of all scientific or technical documents relating to the Product
filed with any Regulatory Authorities in the Territory in order to obtain or
maintain a Registration; provided however, that such documents shall be
considered DUSA Confidential Information and shall be used by PN solely in
connection with its regulatory filing obligations. These documents shall be
provided to PN, upon payment to DUSA of reasonable out-of-pocket handling and
shipping fees, in the language and format of the original filing and be subject
to the provisions of Section 7.4.3.

     5.3 Reimbursement of Costs.

          5.3.1 DUSA shall provide reimbursement funding to PN [ * ] as a result
of activities to be undertaken in support of DUSA's filing of an NDA for the
Product in the Field. Commencing upon the successful conclusion of PN's and/or
its Affiliates' Phase III Clinical Trials and the issuance of the final report,
unless PN's support is requested earlier, DUSA will reimburse PN as follows: (i)
[ * ] per calendar quarter for the first four (4) calendar quarters, (ii) [ * ]
per calendar quarter for the next following four (4) calendar quarters. [ * ].

          5.3.2 Payments of the amounts due under Section 5.3.1 shall be made
within thirty (30) days after the end of each quarter. Notwithstanding anything
to the contrary contained in this Section 5.3, in the event DUSA determines not
to file an NDA for any reason including, by way of example and not limitation,
that the Phase III Clinical Trials do not produce statistically significant
results, DUSA shall not be obligated to start paying, or may cease paying, as
the case may be the amounts set forth in Section 5.3.1, upon written notice to
PN and any amounts due for the quarter during which such a relevant event occurs
shall be made on a pro-rata basis.

     5.4 Adverse Reaction Reporting.

          5.4.1 Each Party responsible for clinical trials shall, with respect
to such trials, record, evaluate, summarize and review all adverse drug
experiences associated with the Compound and the Products. In addition,
supplemental information must be provided regarding the Compound and the
Products at periodic intervals and adverse drug experiences must be reported at
more frequent intervals depending upon the severity of the experience.
Consequently, each Party agrees to comply with the Drug Safety Agreement ("DSA")
attached to and made a part of this Agreement as Exhibit 5.4; provided, however,
if there are any ambiguities or inconsistencies between the terms of the DSA and
the requirements of a Regulatory Authority, or if the requirements of a
Regulatory authority are more stringent in any respect, then the provisions,
rules and regulations of the Regulatory Authority shall apply and the Parties
shall cooperate with each other in order that compliance occurs in a timely
manner.

     5.5 Investigation; Recall. medac shall permit representatives of the FDA or
other Regulatory Authority access to its records and facilities for any reason.
In the event that the

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

Regulatory Authority in any country shall allege or prove that the Product does
not comply with applicable rules and regulations in such country, each Party
shall notify the other immediately and both Parties shall cooperate fully
regarding the investigation and disposition of any such matter. If a Party is
required or should deem it appropriate to recall the Product and such recall is
due to any negligence, recklessness or wrongful intentional acts or omissions
by, or strict liability of, or breach of representation and warranty including,
but not limited to, non-compliance with cGMP, by the other Party, then and in
such event such other Party shall bear all reasonable direct costs associated
with such recall, including, without limitation, refund of the selling price to
end-users and the actual cost of conducting the recall in accordance with the
recall guidelines of the applicable Regulatory Authority. Otherwise, the
recalling Party shall bear all costs and expenses associated with such recall.

6.   GRANT OF RIGHTS; OBLIGATIONS.

     6.1 Development License. PN hereby grants to DUSA, during the term of
the Development Program, the [ * ] license, [ * ], under the Licensed
Technology, to conduct the activities assigned to DUSA under the Development
Program in the Territory.

     6.2 Commercialization License. PN hereby grants to DUSA an [ * ], under the
Licensed Technology, to develop, use, register, market, distribute and sell
Products in the Field and for any Additional Indications for which DUSA
purchases Product under the Supply Agreement; provided, however, [ * ], DUSA's
aforementioned license to develop, use, register, market, distribute and sell
Product for such Additional Indication shall not be limited, even though DUSA
does not purchase Product under the Supply Agreement. Furthermore, PN authorizes
and grants to DUSA the right to reference any Licensed Technology for FDA
purposes regarding any future regulatory filings made by DUSA for any Additional
Indication, including, but not limited to the Barrett's Indication, regardless
of whether DUSA purchases Product for such Additional Indication.

     6.3 No Manufacturing License. Except as set forth in the Supply Agreement,
[ * ]

     6.4 PN License. DUSA hereby grants to PN a [ * ] license, [ * ], to use the
data from Phase II, Phase III or Phase IV clinical trials conducted by DUSA
[ * ].

7.   MILESTONES, ROYALTIES AND JOINT VENTURE.

     7.1 Milestones. As consideration to PN for the license and other rights
granted to DUSA under this Agreement, DUSA shall pay to PN the following
milestone payments within [ * ] days of receipt of written notice of the first
occurrence of each event set forth below. Except as provided in Section 7.3 of
this Agreement, all milestone payments [ * ]. For the avoidance of doubt, [ * ].

<TABLE>
<CAPTION>
     MILESTONE EVENT                                                                    MILESTONE PAYMENT
     ---------------                                                                    -----------------
     <S>                                                                                <C>
     1.   Upon the execution of this Agreement by both Parties                                $[ * ]

     2.   Upon FDA acceptance of DUSA's filing of a Registration Application
     in the U.S. for the Product.                                                             $[ * ]
</TABLE>

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<TABLE>
<CAPTION>
     MILESTONE EVENT                                                                    MILESTONE PAYMENT
     ---------------                                                                    -----------------
     <S>                                                                                <C>
     3.   Upon receipt of the Registration for the Product in the U.S.                        $[ * ]
</TABLE>

     7.2 Obligation to Pay Milestones. Notwithstanding the foregoing, in the
event that in order to obtain a Registration, DUSA is required, or the JDC
determines, upon request of DUSA, (or, if DUSA is forced to exercise its
deciding vote) that it is necessary or desirable for Registration to conduct any
additional preclinical or clinical trials other than those set forth in the
General Development Plan in order to obtain or maintain a Registration, and DUSA
undertakes and pays for same, the costs of such preclinical or clinical trials
[ * ] shall be credited against the amounts due under Milestone Payment 2 or 3,
or refunded if applicable under Section 7.3. In the event that DUSA determines
not to undertake such additional clinical trials as stated in the first sentence
of this Section 7.2, and Milestone Events 2 and/or 3 as set forth in Section 7.1
above do not occur, no further milestones shall be deemed to have been met and
DUSA shall have no obligation to pay any such milestones. Finally, DUSA shall
have no obligation to pay Milestone 2 or 3 if any additional confirmatory
pivotal Phase III clinical trial(s) is required, or the JDC determines, upon
request of DUSA, is necessary or desirable (or, if DUSA is forced to exercise
its deciding vote) to demonstrate statistical significance other than those set
forth on the General Development Plan, and such trial(s) is conducted by DUSA,
which trial(s) measure the same or comparable endpoint as the current Phase III
Clinical Trial (i.e., recurrent rate of disease at six months after the
resection procedure); provided, however, if DUSA does undertake such additional
Phase III clinical trial, then if (i) total patient enrollment occurs within
[ * ], measured from the date that the first patient is enrolled in such trial
to the date that the last patient is enrolled; and (ii) DUSA receives
Registration for the Product in the United States, then DUSA shall pay to PN
[ * ] in accordance with the terms of Section 7.1, instead of the amounts set
forth as Milestone Payments 2 and 3.

     7.3 Refund of Milestones Paid. In the event that Registration for the
Product in the U.S. is denied by the FDA, whose decision shall be binding, after
FDA's acceptance of the filing and payment by DUSA of Milestone Payment 2, PN
shall, within [ * ] days of receipt of written notice from DUSA of such denial,
refund to DUSA [ * ], as well as the costs of any additional preclinical or
clinical trials undertaken by DUSA as set forth in Section 7.2, [ * ], up to a
total of [ * ].

     7.4 Royalty Payments.

          7.4.1 As further consideration to PN for the license and other rights
granted to DUSA under this Agreement, during the Term of this Agreement, DUSA
shall pay to PN a royalty equal to [ * ] of the aggregate Net Sales by DUSA and
its Affiliates within the Field in the U.S. and Canada, which royalty shall in
no case be less than [ * ] per unit sold. For purposes of this Agreement, a unit
shall mean each [ * ] unit of Product for resale containing a [ * ] of the
Compound as the active ingredient.

          7.4.2 With respect to sales of the Product for use in any Additional
Indications proposed and accepted into the Development Program pursuant to
Section 4.3, DUSA and PN shall negotiate in good faith the development costs and
compensation to be paid by each party at such time as the Additional Indication
is accepted into the Development Program.

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

               (a) For purposes of clarification, no royalty shall be due PN on
Net Sales of Product sold for use in connection with any Additional
Indication(s) which has been developed by DUSA, either by itself, on its behalf,
or jointly with a Third Party or for use in the Barrett's Indication following
Registration, or any indications for which DUSA purchases Product pursuant to
the Supply Agreement other than for use in the Field.

          7.4.3 In the event PN uses any data from Phase II, Phase III or Phase
IV clinical trials conducted by DUSA in any IND or Registration Application for
marketing approval in a country outside of the Territory, PN shall pay to DUSA a
royalty equal [ * ] of the aggregate Net Sales of PN and its Affiliates in such
country, which royalty shall in no case be less than [ * ] per unit sold. Should
PN choose to file for Registration [ * ], the royalty shall be paid on Net Sales
of [ * ], provided that DUSA's data is necessary to obtain or maintain
Registration.

     7.5 Reduction for Generic Competition. In the event that a product that is
a Generic Product is being marketed by a Third Party or Parties in any country
in which a Party is selling the Product, the royalties payable to a Party under
Section 7.4 with respect to Net Sales of the Product shall be reduced based upon
the [ * ].

          7.5.1 The [ * ] calculation provisions set forth in Section 7.5 shall
be subject to [ * ] reconciliation, to be completed within [ * ] days of the end
of each [ * ] month period following the initial marketing of a Generic Product
in a country ("Generic Entry"). The total annual royalty payment due will be
determined by comparing actual aggregate Net Sales for [ * ] period after
Generic Entry to the aggregate Net Sales for the [ * ] period prior to Generic
Entry (the "Baseline") and by calculating [ * ] from the Baseline for such year.
In the event such reconciliation reveals an overpayment or underpayment to a
Party, DUSA or PN, as the case may be, shall pay to the other Party the amount
of the discrepancy within [ * ] days after determination of the discrepancy
amount.

     7.6 Obligation to Pay Royalties. There shall be no obligation to pay
royalties to a Party under this Section 7 on sales of Products between a Party
and its Affiliates, if any. The obligation to pay royalties shall arise only
upon the sale by a Party and/or its Affiliates to unrelated Third Parties, such
as end-users and distributors.

     7.7 Sharing of Operating Loss or Profit. The Parties intend to form a joint
venture to obtain Registration in the countries in the Territory outside [ * ].
In such event, DUSA and PN shall share, in accordance with the agreement entered
into between the Parties at the time of formation of the joint venture, the
costs [ * ] associated with commercial sales of the Product in such country.
DUSA and PN shall share, in accordance with the agreement entered into between
the Parties at the time of formation of the joint venture, [ * ]. In the event
that the Parties do not form a joint venture in any one or all of the countries
in the Territory outside [ * ], then the Parties agree to negotiate in good
faith [ * ].

8.   PAYMENTS AND REPORTS.

     8.1 Payments. Beginning with the calendar quarter in which the First
Commercial Sale is made in a country for which royalties are due under Sections
7.4.1 or 7.4.3 and for each calendar quarter thereafter, each Party shall submit
a statement, on a country-by-country basis, of the amount of Net Sales by such
Party during such quarter and the amount of royalties due on such Net Sales.
Each such statement shall be accompanied by the royalty payment due and shall be
submitted quarterly [ * ] days after the end of each calendar quarter. In
addition, payments to each Party of its share of operating profits and/or losses
which may be due under Section 7.7

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

shall be made in accordance with the agreement entered into between the Parties
at the time of formation of the joint venture.

     8.2 Mode of Payment. Each Party shall make all payments required under this
Agreement as directed by the other Party from time to time, [ * ]. All payments
due shall be translated [ * ].

     8.3 Records Retention. Each Party shall keep, and shall cause its
Affiliates and/or Sublicensees to keep, complete and accurate records pertaining
to the sale of Product for a period of three (3) calendar years after the year
in which such sales occurred, and in sufficient detail to permit the other Party
to confirm the accuracy of the aggregate royalty calculations hereunder.

     8.4 Audit Rights.

          8.4.1 During the term of this Agreement and for a period of three (3)
years thereafter, at the request and expense of a Party, the other Party shall
permit and shall cause its Affiliates and Sublicensees to permit an independent,
certified public accountant appointed by the auditing Party and reasonably
acceptable to the Party being audited, at reasonable times and upon reasonable
notice, no more than twice per calendar year, (unless required by an
unanticipated need from a tax or other government agency) to examine such
records as may be necessary to: (i) determine the correctness of any report or
payment made under this Agreement; or (ii) obtain information as to the
aggregate royalties payable for any calendar quarter. Said accountant shall not
disclose to the auditing Party any information other than information relating
to said reports, royalties, and payments. Results of any such examination shall
be made available to both Parties.

          8.4.2 Each Party shall bear the full cost of the performance of any
audit requested by it except as hereinafter set forth. If, as a result of any
inspection of the books and records of a Party by the other, it is demonstrated
that payments under this Agreement were less than the amount which should have
been paid, then all payments required to be made to eliminate any discrepancy
revealed by said inspection shall be made within thirty (30) days after written
demand therefor. Furthermore, if the payments made were less than [ * ] of the
amount that should have been paid during the period in question, the audited
Party shall also reimburse the auditing Party for all costs of such audit.

     8.5 Taxes.

          8.5.1 In the event that a Party is required to withhold any tax to the
tax or revenue authorities in any country regarding any payment to the other
Party due to the laws of such country, such amount shall be deducted from the
payment to be made by such Party, and such Party shall promptly notify the other
Party of such withholding and, within a reasonable amount of time after making
such deduction, furnish the other Party with copies of any tax certificate or
other documentation evidencing such withholding. Each Party agrees to cooperate
with the other Party in claiming exemptions from such deductions or withholdings
under any agreement or treaty from time to time in effect.

          8.5.2 If either Party has the legal obligation to collect and/or pay
any sales, use, excise or value added taxes, the appropriate amount shall be
added to the other Party's invoice and paid by the Party with such legal
obligation, unless the invoiced Party provides the Party with such legal
obligation with a valid tax exemption certificate authorized by the appropriate
taxing authority.

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

9.   INTELLECTUAL PROPERTY.

     9.1 Ownership. Except as otherwise provided in Section 9.2, PN shall
retain all right, title and interest in and to the Licensed Technology
regardless of which Party prepares and files the IND and Registration
Applications, subject to the licenses granted to DUSA pursuant to Section 6.

     9.2 Inventions.

          9.2.1 Rights to Inventions conceived or first reduced to practice
solely by employees and/or consultants of PN shall belong to PN.

          9.2.2 Rights to Inventions conceived or first reduced to practice
solely by employees and/or consultants of DUSA shall belong to DUSA.

          9.2.3 Rights to Inventions which were conceived or first reduced to
practice jointly by employees and/or consultants of PN and by employees and/or
consultants of DUSA, shall belong jointly to PN and to DUSA. The Parties shall
be under no territorial or field restrictions with respect to joint Inventions
and shall have the right to manufacture, have manufactured, use, sell, and offer
to sell such joint Inventions provided, however, that neither Party has the
right to grant or purport to grant any interest in such joint Invention to any
third party without the other Party's consent. To the extent not inconsistent
with an express provision of this Agreement, the laws of [ * ] shall apply to
the rights to Inventions.

          9.2.4 Each Party agrees promptly to provide to the other Party a
complete written disclosure of any Invention in the Field conceived or first
reduced to practice by such Party. DUSA shall determine whether any Invention
owned solely by DUSA or jointly by DUSA and PN is patentable and whether filing
a patent application is economically justifiable, and if so, DUSA shall proceed
with the preparation and prosecution of a patent application covering any such
Invention. If DUSA elects not to file patent applications for any Invention
owned jointly by the Parties, PN shall have the right to file and prosecute
patent applications for such joint Inventions in any country in which DUSA
elects not to file for patent protection. PN shall determine whether any
Invention owned solely by PN is patentable and whether filing a patent
application is economically justifiable, and if so, PN shall proceed with the
preparation and prosecution of a patent application covering any such Invention.

          9.2.5 DUSA and PN shall share [ * ]. The filing, prosecution and
maintenance of patents covering Inventions owned jointly by the Parties shall be
in the name of both Parties. If either Party elects not to pay for (i) the
filing of a patent application in a particular country on any such Invention
which the other Party reasonably believes is patentable, or (ii) the further
prosecution or maintenance of any Invention, or (iii) the filing of any
divisional, continuing, or continuation-in-part, patent application based on any
patent or Invention, such Party shall notify the other Party in a timely manner
and the other Party may do so at its own expense. In such event, such patent or
application shall be assigned by such Party to the other Party, and all of such
assigning Party's rights in such patent or application shall cease.

          9.2.6 Each Party agrees to cooperate with the other Party to execute
all lawful papers, instruments, and assignments, to make all rightful oaths and
declarations and to provide consultation and assistance as may be necessary in
the preparation, prosecution, maintenance and enforcement of all such patents
and patent applications.

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

     9.3 Enforcement.

          9.3.1 If either Party learns of an infringement, unauthorized use,
misappropriation or ownership claim or threatened infringement or other such
claim (any of the foregoing, an "Infringement") by a Third Party with respect to
any Licensed Technology within the Territory, such Party shall promptly notify
the other Party and shall provide such other Party with available evidence of
such Infringement.

          9.3.2 PN shall have the first right, but not the duty, to institute
Infringement actions against Third Parties based on any Licensed Technology in
the Territory. If PN (or its designee) does not secure actual cessation of such
Infringement or institute an Infringement proceeding against an offending Third
Party within ninety (90) days of learning of such Infringement, DUSA shall have
the right, but not the duty, to institute such an action with respect to any
Infringement by such Third Party. The costs and expenses of any such action
(including fees of attorneys and other professionals) shall be borne by the
Party instituting the action, or, if the Parties elect to cooperate in
instituting and maintaining such action, such costs and expenses shall be borne
by the Parties in such proportions as they may agree in writing. Each Party
shall execute all necessary and proper documents, take such actions as shall be
appropriate to allow the other Party to institute and prosecute such
Infringement actions and shall otherwise cooperate in the institution and
prosecution of such actions (including, without limitation, consenting to being
named as a nominal party thereto). Any award paid by Third Parties as a result
of such an Infringement action (whether by way of settlement or otherwise) shall
be applied first to reimburse both Parties for all costs and expenses incurred
by the Parties with respect to such action on a pro rata basis and, if after
such reimbursement any funds shall remain from such award, they shall be
allocated as follows: (i) if PN has instituted and maintained such action alone,
PN shall be entitled to retain such remaining funds; (ii) if DUSA has instituted
and maintained such action alone, DUSA shall be entitled to retain such
remaining funds; or (iii) if the Parties have cooperated in instituting and
maintaining such action, the Parties shall allocate such remaining funds between
themselves in the same proportion as they have agreed to bear the expenses of
instituting and maintaining such action.

     9.4 Infringement Action by Third Parties.

          9.4.1 In the event of the institution or threatened institution of any
suit by a Third Party against DUSA for patent Infringement involving the sale,
distribution or marketing of the Product in the Territory, DUSA shall promptly
notify PN in writing of such suit. Unless otherwise covered by Section 11.2,
DUSA shall have the right to defend such suit at its own expense. PN hereby
agrees to assist and cooperate with DUSA, at DUSA's reasonable request and
expense, in the defense of such suit (including, without limitation, consenting
to being named as a nominal party thereto). During the pendency of such action
and thereafter, DUSA shall continue to make all payments due under this
Agreement.

          9.4.2 In the event that DUSA incurs any liability to a Third
Party for royalties or other damages as the result of any such action as
described in Section 9.4.1 for which PN has indemnified DUSA under Section 11.2,
DUSA shall be entitled (in addition to any damages which may arise under Section
11) to a credit against royalties due under this Agreement in an amount equal to
the damages, costs and expenses, including third-party royalties which may be or
become due. Any credit under this Section which is not applied in the period
incurred may be carried forward and applied to any subsequent period until the
credit has been fully applied.

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

10.  PUBLICATION; CONFIDENTIALITY.

     10.1 Notification. Both Parties recognize that each may wish to publish the
results of their work relating to the subject matter of this Agreement. However,
both Parties also recognize the importance of acquiring patent protection.
Consequently, subject to any applicable laws or regulations obligating either
Party to do otherwise, any proposed publication by either Party shall comply
with this Section 10.1. At least forty-five (45) days before a manuscript is to
be submitted to a publisher, the publishing Party will provide the
non-publishing Party with a copy of the manuscript (or an English translation
thereof). If the publishing Party wishes to make an oral presentation, it will
provide the non-publishing Party with a copy of the abstract (if one is
submitted) at least forty-five (45) days before it is to be submitted. The
publishing Party will also provide to the non-publishing Party a copy of the
text of the presentation, including all slides, posters, and any other visual
aids, at least forty-five (45) days before the presentation is made.

     10.2 Review. The non-publishing Party will review the manuscript, abstract,
text or any other material provided under Section 10.1 to determine whether
patentable subject matter is disclosed. The non-publishing Party will notify the
publishing Party within forty-five (45) days of receipt of the proposed
publication if the non-publishing Party, in good faith, determines that
patentable subject matter is or may be disclosed, or if the non-publishing
Party, in good faith, believes Confidential Information (as defined in Section
10.4) is or may be disclosed. If it is determined by the JDC that patent
applications should be filed, the publishing Party shall delay its publication
or presentation for a period not to exceed ninety (90) days from the
non-publishing Party's receipt of the proposed publication or presentation to
allow time for the filing of patent applications covering patentable subject
matter. In the event that the delay needed to complete the filing of any
necessary patent application will exceed the ninety (90)-day period, the Parties
will consult in good faith to determine an extension of the publication delay
beyond the ninety (90)-day period. If it is determined in good faith by the
non-publishing Party that Confidential Information or proprietary information is
being disclosed, the Parties will consult in good faith to arrive at an
agreement on mutually acceptable modifications to the proposed publication or
presentation to avoid such disclosure.

     10.3 Exclusions. Nothing in Sections 10.1 and 10.2 shall prevent either
Party in connection with efforts to secure financing at any time during the term
of this Agreement: (i) from issuing statements as to achievements made, and the
status of the work being done by the Parties under this Agreement, so long as
such statements do not jeopardize the ability to obtain patent protection on
Inventions or disclose Confidential Information; or (ii) from issuing statements
that such Party determines to be necessary to comply with applicable law
(including the disclosure requirements of the U.S. Securities and Exchange
Commission, Nasdaq or any other stock exchange on which securities issued by
such Party are traded); provided, however, that, to the extent practicable under
the circumstances, such Party shall provide the other Party with a copy of the
proposed text of such statements sufficiently in advance of the scheduled
release thereof to afford such other Party a reasonable opportunity to review
and comment upon the proposed text.

     10.4 Confidentiality; Exceptions. Except to the extent expressly authorized
by this Agreement or otherwise agreed to in writing, the Parties agree that,
during the term of this Agreement and for ten (10) years thereafter, the
receiving Party shall ensure that their respective Affiliates, Sublicensees,
employees, officers, directors and representatives shall keep completely
confidential and not publish or otherwise disclose, and not use for any purpose,
any information furnished to it or them by the other Party or developed under or
in connection with this Agreement, including but not limited to the Licensed
Technology, except to the extent that it can

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[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

be established by the receiving Party by competent proof that such information:
(i) was already known to the receiving Party, other than under an obligation of
confidentiality, at the time of disclosure by the other Party; (ii) was
generally available to the public or otherwise part of the public domain at the
time of its disclosure to the receiving Party; (iii) became generally available
to the public or was otherwise part of the public domain after its disclosure
and other than through any act or omission of the receiving Party in breach of
this Agreement; or (iv) was disclosed to the receiving Party, other than under
an obligation of confidentiality, by a Third Party who had no obligation to the
disclosing Party not to disclose such information to others (all such
information to which none of the foregoing exceptions applies, "Confidential
Information").

     10.5 Exceptions to Obligation. The restrictions contained in Section 10.4
shall not apply to Confidential Information that: (i) is submitted by the
recipient to governmental authorities to facilitate the issuance of
Registrations for the Product, provided that reasonable measures shall be taken
to assure confidential treatment of such information; (ii) is provided by the
recipient to Third Parties under confidentiality provisions at least as
stringent as those in this Agreement, for consulting, manufacturing development,
manufacturing, external testing, marketing trials and, with respect to DUSA, to
Third Parties who are Sublicensees or other development/marketing partners of
DUSA with respect to any of the subject matter of this Agreement; (iii) is
subject to publication rights by clinical investigators under agreements with PN
or medac entered into prior to the date of this Agreement; or (iv) is otherwise
required to be disclosed in compliance with applicable laws or regulations or
order by a court or other regulatory body having competent jurisdiction;
provided that if a Party is required to make any such disclosure of the other
Party's Confidential Information such Party will, except where impracticable for
necessary disclosures (for example, to physicians conducting studies or to
health authorities), give reasonable advance notice to the other Party of such
disclosure requirement and, except to the extent inappropriate in the case of
patent applications, will use its best efforts to secure confidential treatment
of such Confidential Information required to be disclosed.

     10.6 Limitations on Use. Each Party shall limit the use, and cause each of
its Affiliates and its Sublicensees to limit the use, of any Confidential
Information obtained by such Party from the other Party, its Affiliates or its
Sublicensees, pursuant to this Agreement or otherwise, so that such use is
solely in connection with the activities or transactions contemplated hereby.

     10.7 Remedies. Each Party shall be entitled, in addition to any other right
or remedy it may have, at law or in equity, to an injunction, without the
posting of any bond or other security, enjoining or restraining the other Party,
its Affiliates and/or its Sublicensees from any violation or threatened
violation of this Section 10..

11.  INDEMNIFICATION.

     11.1 Indemnification by DUSA. DUSA shall indemnify, keep indemnified,
defend and hold harmless PN and its Affiliates, and their respective directors,
officers, employees and agents from and against [ * ], whether in tort,
contract, or as a result of a breach of statutory duty or otherwise and whether
or not foreseeable [ * ] arising out of or resulting from:

          11.1.1 negligence, recklessness or wrongful intentional acts or
omissions of DUSA, its Affiliates or its Sublicensees, if any, and their
respective directors, officers, employees and agents in connection with DUSA's
fulfillment of its obligations under this Agreement; or

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[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

          11.1.2 any breach of any representation or warranty made by DUSA under
Section 2.

          11.2 Indemnification by PN. PN shall indemnify, keep indemnified,
defend and hold harmless DUSA, its Affiliates, its Sublicensees and
distributors, and their respective directors, officers, employees and agents,
from and against [ * ] however arising, whether in tort, contract, or as a
result of a breach of statutory duty or otherwise and whether or not foreseeable
[ * ] arising out of or resulting from:

          11.2.1 negligence, recklessness or wrongful intentional acts or
omissions of PN or its Affiliates, and their respective directors, officers,
employees and agents, in connection with PN's fulfillment of its obligations
under this Agreement;

          11.2.2 any breach of any representation or warranty made by PN under
Section 2; or

          11.2.3 any warranty claims, Product recalls or any tort claims of
personal injury (including death) or property damage relating to or arising out
of any manufacture, use, distribution or sale of the Compound or a Product by PN
or its Affiliates due to any negligence, recklessness or wrongful intentional
acts or omissions by, or strict liability of, PN or its Affiliates, and their
respective directors, officers, employees and agents, except, in each case, to
the comparative extent such claim arose out of or resulted from the negligence,
recklessness or wrongful intentional acts or omissions of DUSA, its Affiliates
or its Sublicensees, and their respective directors, officers, employees and
agents.

     11.3 Notice of Indemnification. In the event that any person (an
"Indemnitee") entitled to indemnification under Section 11.1 or Section 11.2 is
seeking such indemnification, such Indemnitee shall inform the indemnifying
Party of the claim as soon as reasonably practicable after such Indemnitee
receives notice of such claim, shall permit the indemnifying Party to assume
direction and control of the defense of the claim (including the sole right to
settle it at the sole discretion of the indemnifying Party, provided that such
settlement does not impose any obligation on, or otherwise adversely affect, the
Indemnitee or the other Party) and shall cooperate as requested (at the expense
of the indemnifying Party) in the defense of the claim.

     11.4 Complete Indemnification. As the Parties intend complete
indemnification, all costs and expenses incurred by an Indemnitee in connection
with enforcement of Sections 11.1 and 11.2 shall also be reimbursed by the
indemnifying Party. The parties agree that if any indemnification or
reimbursement sought pursuant to Sections 11.1 or 11.2 is for any reason
unavailable or insufficient to hold it harmless (except by reason of the gross
negligence or willful misconduct of an Indemnified Party) then, the indemnifying
party shall contribute to the liabilities for which such indemnification or
reimbursement is held unavailable in such portion as is appropriate to reflect
(a) the relative benefits to the indemnified party on the one hand and
indemnifying party on the other hand, in connection with the transaction to
which such indemnification or reimbursement relates or (b) if the allocation
provided by clause (a) above is not available, in such proportion as is
appropriate to reflect not only the relative benefits referred to in such clause
(a), but also the relative fault of the parties as well as any other relevant
equitable considerations.

12.  INSURANCE.

     12.1 PN maintains and will continue to maintain during the period that it
conducts clinical trials, as sponsor, with the Compound, clinical trial
liability insurance of at least [ * ] in

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

the aggregate, at its cost. Similarly, DUSA will continue to maintain during the
period that it conducts clinical trials, as sponsor, with the Compound, clinical
trial liability insurance of at least [ * ] per incident and in the aggregate,
at its cost. Each party shall obtain by the date of the date of the First
Commercial Sale and shall continue to maintain, at its cost, , so long as the
Product is commercialized in the Territory and wherever sold in the rest of the
world, a general liability/product liability insurance policy providing coverage
of at least [ * ]. Both parties shall alternatively have the right to satisfy
the obligation for any insurance under this Section 12 through a reasonable
program of self-insurance. Both Parties shall provide written evidence of such
insurance coverage to the other Party upon request.

13.  TERM; TERMINATION.

     13.1 Term. This Agreement shall become effective as of the Effective Date
and shall remain in full force and effect for a period of [ * ] years from the
date of receipt of the first Registration in any country in the Territory,
unless earlier terminated pursuant to one of the other provisions of Section 13
(the "Initial Term"). Following expiration of the Initial Term, the Agreement
shall be automatically renewed for successive one (1) year renewal periods
(each, a "Renewal Term"); provided, however, that at any time following
expiration of the Initial Term, either Party shall have the right to terminate
this Agreement upon [ * ] days prior written notice. The Initial Term and all
Renewal Terms, or parts thereof, shall collectively be referred to as the
"Term".

     13.2 Termination by DUSA or PN. Notwithstanding the language contained in
Section 13.1:

          13.2.1 In the event that a Pre-NDA Meeting is not scheduled because,
based upon the final report, the Phase III Clinical Trial fails to produce
Statistically Significant Results, DUSA shall have the right, at any time, in
its discretion, to terminate this Agreement, in whole or in part, based upon its
commercially reasonable judgment exercised in good faith, upon [ * ] prior
written notice to PN. It is understood that as used in this Agreement, the right
to terminate "in part" shall mean that a Party has the right to terminate this
Agreement on (i) an indication-by-indication basis, (ii) a country-by-country
basis, or (iii) any combination of the two (2).

          13.2.2 After the Pre-NDA Meeting with the FDA, DUSA shall have the
right, at any time, in its discretion, to terminate this Agreement, in whole or
in part, based upon its commercially reasonable judgment exercised in good
faith, upon [ * ] days prior written notice to PN.

          13.2.3 Subject to a decision of the JDC under Section 3.2.4, in the
event that the final report for the Phase III Clinical Trial is not completed
before [ * ], DUSA shall have the right, at any time thereafter, in its
discretion, to terminate this Agreement, in whole or in part, upon [ * ] days
prior written notice to PN.

          13.2.4 After the Pre-NDA Meeting, if it occurs, DUSA shall have the
right to terminate this Agreement, in whole or in part, upon [ * ] notice to PN,
if the light device(s) used in PN's or its Affiliate's clinical trials and/or
approved for use with the Product in the Field cannot be purchased by end-users
on commercially reasonable terms (without regard to price).

          13.2.5 In the event that DUSA decides not to undertake any additional
pre-clinical or clinical trials as set forth in Section 7.2, either Party shall
have the right to terminate this Agreement with respect to the applicable
country in the Territory for which such additional pre-clinical or clinical
trials are required, upon [ * ] prior written notice to the other Party.

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[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

          13.2.6 In the event that DUSA fails to file a Registration Application
in the U.S. not later than [ * ]; provided, however, that the [ * ] time period
for filing in the U.S. shall be extended for additional reasonable periods of
time needed to respond to any requests from applicable Regulatory Authority for
information not prepared for submission to the Regulatory Authority at the date
of delivery of the final report mentioned above, or as determined by the JDC.

     13.3 Termination for Cause. Either Party (the "Non-breaching Party") may,
without prejudice to any other remedies available to it at law or in equity,
terminate this Agreement, in whole or in part, in the event the other Party (the
"Breaching Party") shall have breached or defaulted in the performance of any of
its material obligations hereunder, and such default shall have continued for
[ * ] days after written notice thereof was provided to the Breaching Party by
the Non-breaching Party (or, if such default cannot be cured within such
[ * ] day period, if the Breaching Party does not commence and diligently
continue actions to cure such default during such [ * ] day period). Any such
termination shall become effective at the end of such [ * ] day period unless
the Breaching Party has cured any such breach or default prior to the expiration
of such [ * ]day period (or, if such default cannot be cured within such [ * ]
day period, if the Breaching Party has commenced and diligently continued
actions to cure such default). The right of either Party to terminate this
Agreement as provided in this Section 13 shall not be affected in any way by
such Party's waiver or failure to take action with respect to any previous
default.

     13.4 Termination for Insolvency. Either Party may terminate this Agreement,
in whole or in part, as the terminating Party may determine, by written notice
to the other Party in the event that such other Party shall (i) have become
insolvent or bankrupt, (ii) have made an assignment for the benefit of its
creditors, (iii) have been appointed a trustee or receiver of such Party for all
or a substantial part of its property, or (iv) have any case or proceeding
commenced or other action taken by or against such Party (as to which, if
involuntarily commenced against such Party, such Party not being able to obtain
dismissal within [ * ] days after commencement thereof) in bankruptcy or seeking
reorganization, liquidation, dissolution, winding-up, arrangement, composition
or readjustment of its debts or any other relief under any bankruptcy,
insolvency, reorganization or other similar act or applicable law now or
hereafter in effect.

     13.5 Effect of Expiration or Termination.

          13.5.1 Following the expiration of the Initial Term of this Agreement,
or if this Agreement is terminated pursuant to Sections 13.2.4, and 13.4, DUSA
shall have [ * ], to continue to market, distribute and sell Product in all
countries in the Territory, and the [ * ] right to use the Licensed Technology
in connection therewith; provided, however, that except as set forth in the
Supply Agreement, DUSA shall have no right [ * ]; and provided, however, if DUSA
receives approval to market the Product in the Field with a light device not
originally identified by the parties within [ * ] months of the termination
under Section 13.2.4, DUSA shall owe PN royalties on Net Sales pursuant to
Section 7.4.1 and Milestones 2 and 3 under Section 7 less any and all costs or
expenses incurred by DUSA to develop or have developed such light device,
including without limitation, engineering costs, licensing costs, reasonable
overhead costs, sales and marketing costs, and lost profits related to such
light device (which costs and expenses shall be reviewed and subject to the
approval process of the JDC set forth in Section 3).

          13.5.2 If this Agreement is terminated in its entirety by DUSA
according to Section 13.3 by reason of breach by PN, in addition to any other
remedies available to DUSA at law or in equity: (i) PN shall promptly transfer
to DUSA copies of all data, reports, records and materials in PN's possession or
control that relate to the Development Program and return to

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

DUSA all relevant records and materials in PN's possession or control containing
Confidential Information of DUSA (provided that PN may keep one copy of such
Confidential Information of DUSA for archival purposes only); (ii) DUSA shall
have an exclusive, royalty-free, perpetual right with the right to grant
sublicenses to make, have made, use, market, distribute, sell, manufacture and
have manufactured any Product in the Territory, and the exclusive, perpetual and
paid-up right, with the right to grant sublicenses, to use the Licensed
Technology in the Territory. To that end, DUSA may continue to hold and use all
data, reports, records and material in DUSA's possession or control that relate
to the Development Program, and may hold all INDs, Registration Applications,
Registrations and other regulatory filings made or filed by DUSA for a Product,
pursuant to this Agreement, and may in its sole discretion continue any
sublicenses granted by DUSA under this Agreement. If this Agreement is
terminated in its entirety by PN according to Section 13.3 by reason of breach
by DUSA, in addition to any other remedies available to PN at law or in equity,
DUSA shall relinquish its rights and licenses in the Field in the Territory
including, without limitation, the use of clinical data regarding the
fluorescence-guided resection of glioblastoma, but shall retain all rights and
licenses with respect to Additional Indications.

          13.5.3 If this Agreement is terminated pursuant to Sections 13.2.1,
13.2.2, or 13.2.3, then (i) until the last expiration date of DUSA's patents or
existing patent licenses with respect to the Product, or (ii) for so long as
DUSA has filed an IND with respect to the Product in a specific Additional
Indication, is diligently pursuing marketing approval, and/or commercializing
the Product in this respective Additional Indication, (whichever of (i) or (ii)
is longer), DUSA shall have an [ * ] to develop, use, register, market,
distribute, and sell any Product in the Territory, and the [ * ], to use the
Licensed Technology in the Territory, for these respective Additional
Indications and [ * ], and shall have [ * ] for all other Additional Indications
from the date of termination of this Agreement and thereafter, but shall [ * ]
including, without limitation, the use of clinical data regarding the
fluorescence-guided resection of glioblastoma; provided, however, that except as
set forth in the Supply Agreement, DUSA shall have [ * ].

          13.5.4 If this Agreement is terminated pursuant to Section 13.2.5,
DUSA shall [ * ] including, without limitation, the [ * ].

          13.5.5 If this Agreement is terminated pursuant to Section 13.2.6,
DUSA shall [ * ].

     13.6 Accrued Rights; Surviving Obligations.

          13.6.1 Termination, relinquishment or expiration of this Agreement for
any reason shall be without prejudice to any rights that shall have accrued to
the benefit of either Party prior to such termination, relinquishment or
expiration. Such termination, relinquishment or expiration shall not relieve
either Party from obligations which are expressly indicated to survive
termination or expiration of this Agreement; provided, however, that no unpaid
milestones which may become due subsequent to a notice of termination by DUSA
shall be payable to PN (so long as no unauthorized use of Licensed Technology by
DUSA occurs).

          13.6.2 All of the Parties' rights and obligations under, and/or the
provisions contained in, Sections 2, 4.3.5, 4.5, 4.6, 5.4, 5.5, 6.2 (solely with
respect to DUSA's right to reference the Licensed Technology), 7.3, 8.1 (solely
for payments due for sales before the expiration, termination or relinquishment
of the Agreement) 8.3, 8.4, 8.5, 9, 10.4, 10.5, 10.6, 10.7, 11, 12, 13.4, 13.5,
15.3, 15.5, 15.6, 15.11 and 15.12 shall survive termination, relinquishment or
expiration of this Agreement.

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

14.  FORCE MAJEURE.

     14.1 Events of Force Majeure. Neither Party shall be held liable or
responsible to the other Party nor be deemed to be in default under, or in
breach of any provision of, this Agreement for failure or delay in fulfilling or
performing any obligation of this Agreement when such failure or delay is due to
Force Majeure, and without the fault or negligence of the Party so failing or
delaying. For purposes of this Agreement, Force Majeure is defined as causes
beyond the control of the Party, including, without limitation, acts of God;
acts, regulations, or laws of any government; terrorism; war; civil commotion;
destruction of production facilities or materials by fire, flood, earthquake,
explosion or storm; labor disturbances; epidemic; and failure of public
utilities or common carriers. In such event DUSA or PN, as the case may be,
shall immediately notify the other Party of such inability and of the period for
which such inability is expected to continue. The Party giving such notice shall
thereupon be excused from such of its obligations under this Agreement as it is
thereby disabled from performing for so long as it is so disabled and the thirty
(30) days thereafter. To the extent possible, each Party shall use reasonable
efforts to minimize the duration of any Force Majeure.

15.  MISCELLANEOUS.

     15.1 Relationship of Parties. Nothing in this Agreement is intended or
shall be deemed to constitute a partnership, agency, employer-employee or joint
venture relationship between the Parties. No Party shall incur any debts or make
any commitments for the other, except to the extent, if at all, specifically
provided herein.

     15.2 Assignment. Neither Party shall be entitled to assign its rights
hereunder without the express written consent of the other Party hereto, except
that each Party may assign its rights and transfer its duties hereunder to any
assignee of all or substantially all of its business (or that portion thereof to
which this Agreement relates), in the event of such Party's merger,
consolidation or involvement in a similar transaction or in the event of the
purchase of in excess of fifty (50%) of the voting securities of a Party by such
assignee. No assignment and transfer shall be valid or effective unless done in
accordance with this Section 13.2 and unless and until the assignee/transferee
shall agree in writing to be bound by the provisions of this Agreement.

     15.3 Books and Records. Any books and records to be maintained under this
Agreement by a Party or its Affiliates or Sublicensees shall be maintained in
accordance with the generally accepted accounting principles of each respective
Party's country of formation, consistently applied.

     15.4 Further Actions. Each Party shall execute, acknowledge and deliver
such further instruments, and do all such other acts, as may be necessary or
appropriate in order to carry out the purposes and intent of this Agreement.

     15.5 Notice.

          15.5.1 Any notice or request required or permitted to be given under
or in connection with this Agreement shall be deemed to have been sufficiently
given if in writing and personally delivered or sent by certified mail (return
receipt requested), facsimile transmission (receipt verified), or overnight
express courier service (signature required), prepaid, to the Party for which
such notice is intended, at the address set forth for such Party below:

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

          (a)       In the case of DUSA, to:

                              DUSA Pharmaceuticals, Inc.
                              25 Upton Drive
                              Wilmington, Massachusetts 01887
                              Attention: D. Geoffrey Shulman, President
                              Facsimile No.: 978-657-9193
                              Telephone No.: 978-657-7500

          (b)       In the case of PN, to:

                              Photonamic GmbH & Co. KG.

                              Fehlandtstrasse 3
                              20354 Hamburg, Germany
                              Attention: Rainer Uhlenbusch, MD
                              Facsimile No.:0049-4103 8006 100
                              Telephone No.:0049-4103 8006 0

or to such other address for such Party as it shall have specified by like
notice to the other Party, provided, however, that notices of a change of
address shall be effective only upon receipt thereof. If delivered personally or
by facsimile transmission, the date of delivery shall be deemed to be the date
on which such notice or request was given. If sent by overnight express courier
service, the date of delivery shall be deemed to be the next business day after
such notice or request was deposited with such service. If sent by certified
mail, the date of delivery shall be deemed to be the fifth (5th) business day
after such notice or request was deposited with the U.S. or German Postal
Service, as the case may be.

          15.5.2 All correspondence, notices and other communications of any
kind whatsoever given between the Parties, including, without limitation, all
data, information and reports relating to the Development Program and all
regulatory filings, shall be promptly provided to the other Party in English, or
as an English translation thereof, as the case may be.

     15.6 Use of Name. Except as otherwise provided herein, neither Party shall
have any right, express or implied, to use in any manner the name or other
designation of the other Party or any other trade name or trademark of the other
Party (including, without limitation, the Trademarks) for any purpose in
connection with the performance of this Agreement.

     15.7 Public Announcements. Except as permitted by Section 10.3 and subject
to Section 10.4, neither Party shall make any public announcement concerning
this Agreement or the subject matter hereof without first providing the other
Party with a copy of the proposed public announcement for its review at least
three (3) days before the scheduled release date of the announcement.

     15.8 Waiver. A waiver by either Party of any of the terms and conditions of
this Agreement in any instance shall not be deemed or construed to be a waiver
of such term or condition for the future, or of any subsequent breach hereof.
All rights, remedies, undertakings, obligations and agreements contained in this
Agreement shall be cumulative and none of them shall be in limitation of any
other remedy, right, undertaking, obligation or agreement of either Party.

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[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

     15.9 Severability. When possible, each provision of this Agreement will be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Agreement is held to be prohibited by or invalid
under applicable law, such provision will be ineffective only to the extent of
such prohibition or invalidity, without invalidating the remainder of this
Agreement.

     15.10 Amendment. No amendment, modification or supplement of any provisions
of this Agreement shall be valid or effective unless made in writing and signed
by a duly authorized officer of each Party.

     15.11 Governing Law; [ * ] Original Controlling; Venue. This Agreement
shall be governed by and interpreted in accordance with the laws of [ * ]
without regard to conflicts of law principles. The English original of this
Agreement shall prevail over any translation hereof. The place of venue shall be
[ * ].

     15.12 Entire Agreement. This Agreement, together with the schedules and
exhibits hereto, sets forth the entire agreement and understanding between the
Parties as to the subject matter hereof and merges all prior discussions and
negotiations between them, and neither of the Parties shall be bound by any
conditions, definitions, warranties, understandings or representations with
respect to such subject matter other than as expressly provided herein or as
duly set forth on or subsequent to the date hereof in writing and signed by a
proper and duly authorized officer or representative of the Party to be bound
thereby.

     15.13 Parties in Interest. All of the terms and provisions of this
Agreement shall be binding upon, inure to the benefit of and be enforceable by
the Parties hereto and their respective permitted successors and assigns.

     15.14 Descriptive Headings. The descriptive headings of this Agreement are
for convenience only, and shall be of no force or effect in construing or
interpreting any of the provisions of this Agreement.

     15.15 Counterparts. This Agreement may be executed simultaneously in any
number of counterparts, any one of which need not contain the signature of more
than one Party but all such counterparts taken together shall constitute one and
the same agreement.

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[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

     IN WITNESS WHEREOF, each of the Parties has caused this Agreement to be
executed by its duly authorized representative as of the day and year first
above written.

<TABLE>
<S>                                   <C>
PHOTONAMIC GmbH & Co. KG              DUSA PHARMACEUTICALS, INC.

By: [ * ]                             By: /s/ D. Geoffrey Shulman
    -----------------------------         ------------------------------
[ * ]                                     D. Geoffrey Shulman, MD, FRCPC
---------------------------------         President and Chief Executive Officer
[ * ]
-----

30 December 2002

By [ * ]
   ------------------------------
[ * ]
-----
[ * ]
-----
</TABLE>

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                   EXHIBIT 1.8

                                  THE COMPOUND

<TABLE>
<S>                               <C>
NAME AND STRUCTURE

NAME OF ACTIVE SUBSTANCE:         5-Aminolevulinic acid hydrochloride
(INN)

CHEMICAL NAME:                    5-Amino-4-oxo-pentanoic acid hydrochloride

SYNONYMS:                         5-Aminolevulinic acid hydrochloride,
                                  (delta)-Aminolevulinic acid hydrochloride

ABBREVIATIONS:                    5-ALA, (delta)-ALA, 5-ALS

EMPIRICAL FORMULA:                C(5)H(9)NO(3) - HCl

MOLECULAR WEIGHT:                 167.59 g/mol
                                  (5-Aminolevulinic acid  hydrochloride)

STRUCTURAL FORMULA:               (STRUCTURAL FORMULA GRAPHIC)
</TABLE>

                                      -27-
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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                        EXHIBIT 1.26 LICENSED TECHNOLOGY

            medac Preclinical, Clinical and Manufacturing Information

<TABLE>
<S>        <C>      <C>
A          [ * ]

           -        Study Report No. 10122/1/96
                    Study Report No. 10123/1/96

           -        Study Report No. 10827/97
                    Study Report No. 10828/97

B          [ * ]

           -        Study Report No. 10112/96
           -        Study Report No. 10113/96
           -        Study Report No. 10114/96

C          [ * ]

           -        Reference:
           -        Stender IM, Bech-Thomsen N. Poulsen T, Wulf
           -        HC (1997)

D          [ * ]
           [ * ]

           -        Study Report No. 10118/1/96
           -        Study Report No. 10120/1/96
           -        Study Report No. 10117/1/96
           -        Study Report No. 10119/1/96
           -        Study Report No. 10116/1/96
           -        Study Report No. 10115/1/96

E          [ * ]

           -        Analytical Report No. 9721/1/96
           -        Analytical Report No. 10575/97

F          OTHER INFORMATION

           -        Study Report No. 10121/1/96
</TABLE>

                                      -28-
<PAGE>
                                                                  EXECUTION COPY

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

<TABLE>
<S>        <C>      <C>

           -        List and contact information of all clinical investigators

G          [ * ]

           -        LPT Report No. 11654/98 [ * ]

           -        LPT Report No. 11653/98 [ * ]

           -        LPT Report No. 11652/98 [ * ]

           -        LPT Report No. 13105/00 [ * ]

           -        LPT Report No. 11655/98 [ * ]

           -        LPT Report No. 11853/98 [ * ]

           -        LPT Report No. 11656/98 [ * ]

           -        LPT Report No. 11651/98 [ * ]

           -        LPT Report No. 11664/98 [ * ]

H          [ * ]

           [ * ]

C.1.1.     -        Specification and routine tests

C.1.2.1.   -        Nomenclature

C.1.2.2.   -        Description

C.1.2.3.   -        Manufacture (Restricted to authorities)*

           -        Quality Control during Manufacture (Restricted to authorities)*

C.1.2.3.1. -        Name and Address of Manufacturing Site

C.1.2.3.2  -        Synthetic Route

C.1.2.5.   -        Development Chemistry

C.1.2.6.   -        Impurities (Restricted to authorities)*

C.1.2.7.   -        Comparison of [ * ]

C.1.2.8.   -        Reference Standards

C.1.2.9.   -        Batch Analysis
</TABLE>

                                      -29-
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AMENDED.

<TABLE>
<S>        <C>      <C>

           -        Appendix Analytical Validation (non-compendial methods)

           -        Stability Tests on the Active Ingredients

           -        Appendix Literature

           -        Appendix [ * ]

           -        Appendix Expert comment and formats

I          [ * ]

           -        Study MC-ALS.8/GLI incl. amendments

           -        CRF of MC-ALS.8/GLI

           -        (Final study report of MC-ALS.8/GLI and statistical analysis when
                    available)

           -        Study MC-ALS.3/GLI incl. amendments

           -        CRF of MC-ALS.3/GLI

           -        (Final study report of MC-ALS.3/GLI and statistical analysis when
                    available)

           -        (Interim Statistical Analysis of MC-ALS.3/GLI when available, including
                    Case Report Forms and data listings)

           -        IKP Study 10/01-03.ALA; medac Study No. MC-ALS.20/BV [ * ]
</TABLE>

                                      -30-
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AMENDED.

                        EXHIBIT 5.4 DRUG SAFETY AGREEMENT

                              DRUG SAFETY AGREEMENT
             STANDARD AGREEMENT ON EXCHANGE OF PHARMACOVIGILANCE AND
                             REGULATORY INFORMATION

<TABLE>
<S>                                            <C>
--------------------------------------------------------------------------------
PHOTONAMIC GMBH & CO.KG                        DUSA PHARMACEUTICALS, INC.

Fehlandtstrasse 3                              25 Upton Drive
D-20354 Hamburg                                Wilmington, Massachusetts 01887
Germany                                        USA
--------------------------------------------------------------------------------
</TABLE>

-    This drug safety agreement was drawn up by PHOTONAMIC (hereinafter referred
     to as the < < Licensor > >) and DUSA (hereinafter referred to as < <
     Licensee > >).

-    Photonamic and DUSA are parties to a Licensing and Development contract on
     5-ALA (5-aminolevulinic acid) hereinafter referred to as the < < Product
     > >). The Pharmacovigilance is performed by medac Gesellschaft fuer
     klinische Spezialpraeparate mbH in charge of Photonamic (see Article 12).

-    Territories: as listed in the "Licensing and Development contract":
     Photonamic Territory: Any country other than DUSA's territories. DUSA
     Territory: United States and [ * ].

The parties have mutually agreed :

ARTICLE 1 - EXPEDITED REPORTING

1.1  Each party shall report to the other party Serious Adverse Drug Reactions
     regarding the Product within a maximum of [ * ] from being received by
     either party.

1.2  The same time frames apply to the follow-up reports.

1.3  The Licensee will report to its Authorities all Serious Adverse Drug
     Reactions occurring in the DUSA Territory regarding the Product, and will
     send copies to the Licensor.

1.4  The Licensor will report to the Licensee all Serious Adverse Drug Reactions
     occurring in the Photonamic Territory and [ * ] regarding any other
     Photonamic medicines containing the same active compound as the Product
     when transmitted by Photonamic's Licensees, for purposes of information.

1.5  The Licensor will send to the Licensee copies of all reports of Serious
     Adverse Drug Reactions (expected and unexpected) occurring outside the
     European Union regarding any other Photonamic medicines containing the same
     active compound as the Product. The

                                      -31-
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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

     Licensee will report the Unexpected Serious Adverse Drug Reactions to its
     Authorities, using medac's case number.

1.6  Each party shall ensure parallel reporting to the Regulatory Authorities of
     all local and foreign expedited reports in their respective countries in
     which a marketing authorization or a marketing license is granted,
     according to the requirements of the applicable laws and regulations in
     such countries.

1.7  Expedited reporting between the parties shall be conducted according to the
     definitions of The Rules Governing Medicinal Products in the European Union
     Volume 9 - Pharmacovigilance; provided, however, that if a Regulatory
     Authority has a requirement which is stricter than the requirements of The
     Rules Governing Medicinal Products in the European Union Volume 9 -
     Pharmacovigilance, the parties will comply with such stricter requirement.
     The parties shall promptly inform each other in writing about such stricter
     requirements applicable in their respective territory, especially after the
     requirements have been changed.

1.8  Both parties have agreed upon the format of the suspected Adverse Drug
     Reaction report and an e-mail or fax transmission mode.

1.9  The safety reference Product Information used for determining the labeling
     of a reaction is the current version of the Summary of Product
     Characteristics approved in the respective Territory.

ARTICLE 2 - NON EXPEDITED REPORTING FOR ADVERSE DRUG REACTIONS

2.1  Individual safety reports which fulfil the criteria of Non-serious Adverse
     Drug Reactions shall be collected by each party.

2.2  Every [ * ], the individual cases shall be exchanged between both parties
     by sending each other a line-listing including all the adverse reactions
     received by each party, including the expedited cases already exchanged.
     Four quarterly reports covering the following periods: January to March,
     April to June, July to September and October to December will be addressed
     to each party.

2.3  The format and the content of this line-listing must include all the items
     which are part of The Rules Governing Medicinal Products in the European
     Union, Volume 9 - Pharmacovigilance

ARTICLE 3 - PERIODIC SAFETY UPDATE REPORTS (PSURS)

3.1  The Licensor is responsible for writing a Periodic Safety Update Report for
     Photonamic medicines containing the same active compound as the Product.
     The Licensee is responsible for submitting the PSUR to its Authorities
     after adding the recent Territory data according to the requirements of the
     applicable laws and regulations in such countries.

                                      -32-
<PAGE>

                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

3.2  The current issuing schedule for the Periodic Safety Update Report is set
     at various frequencies. The PSUR will be issued at least every [ * ] upon
     renewal of the marketing authorization in the respective Territory, but
     will comply with all reporting requirements stated above.

3.3  The format and the content of the Periodic Safety Update Report must comply
     with The Rules Governing Medicinal Products in the European Union, Volume 9
     - Pharmacovigilance

3.4  The Licensee will send to the Licensor, the following information, to be
     included in the PSUR :

     -    Update on regulatory or manufacturer actions taken for safety reasons
     -    Change to Product Reference Safety Information
     -    Studies (company-sponsored studies, planned safety studies, published
          safety studies)
     -    Results from local literary reviews
     -    Periodic Safety Reports on Levulan(R) (aminolevulinic acid)

3.5  The Licensor will review the international literature when preparing the
     PSUR.

3.6  If not already identified and exchanged before, any potential labeling
     change mentioned in the PSUR should be discussed by both parties before
     issuing the PSUR.

ARTICLE 4 - INFORMATION ON ANY REGULATORY ACTION RELATING TO THE SAFETY OF THE
PRODUCT

Each party will notify the other party within [ * ] of the following actions
related to safety in one of its territories, including but not limited to :

     -    any Marketing Authorization withdrawal
     -    any Regulatory / Safety restrictions on distribution of the product
     -    any intention to distribute a "Dear Doctor Letter"
     -    any clinical trial suspension
     -    any intended labeling change for the product
     -    any request for a labeling change for the product by a regulatory
          authority
     -    any inquiry undertaken on the product by an agency
     -    any findings of adverse effects in animals, e.g. mutagenicity,
          teratogenicity, carcinogenicity which might induce a significant risk
          for human subjects.

ARTICLE 5 - INDEMNIFICATION

The parties shall make best efforts to obtain Pharmacovigilance and Regulatory
Information as described above. The Licensor shall not bear any legal
responsibility for accuracy or correctness of translation of any
Pharmacovigilance and Regulatory Information received from the Licensee

                                      -33-
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                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

or for any delay or failure by the Licensee in reporting of Pharmacovigilance or
Regulatory Information.

ARTICLE 6 - CONFIDENTIALITY

The parties shall keep confidential any and all Pharmacovigilance and Regulatory
Information received from the other party.

Neither party shall disclose the same to any third party, except for Licensor's
Licensees and affiliates and for Regulatory Authorities in fulfilling the terms
of this agreement.

ARTICLE 7 - COST

Each party will bear any cost and expenses incurred in connection with its own
performance in fulfilling the terms of the agreement expressed herein.

ARTICLE 8 - CODIFICATION AND TRANSMISSION METHOD

A standard dictionary should be used for codification of Adverse Drug Reactions.
All Pharmacovigilance and Regulatory Information shall be in written form or in
an agreed electronic format sent to the persons named and appointed by the
Licensor and by the Licensee. The format used must be consistent with the ICH
guidelines.

ARTICLE 9 - TERM

This agreement on exchange of Pharmacovigilance and Regulatory Information on
the Product shall come into effect on the date of signature by both parties and
shall continue in full force and effect until the date of expiration or
termination of the Licensing and Development contract.

ARTICLE 10 - LITIGATION

In the event of litigation, the parties agree to refer to the jurisdiction
paragraph of the license agreement regarding the Product.

ARTICLE 11 - MISCELLANEOUS

11.1 The English language shall be used for all notices, communications and
     exchange in writing hereunder.

                                      -34-
<PAGE>
                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

11.2 The parties shall meet to agree to any necessary amendments and updates, in
     particular those due to changes of laws and regulations of any territory or
     in cases of additional Licensees or new territories. The Rules Governing
     Medicinal Products in the European Union, Volume 9 - Pharmacovigilance, are
     to be strictly followed.

ARTICLE 12 - CONTACT PERSONS

<TABLE>
<S>                                               <C>
-------------------------------------------------------------------------------------------
PHOTONAMIC GMBH & CO.KG                           DUSA PHARMACEUTICALS, INC.
Fehlandtstrasse 36
D-20354 Hamburg                                   25 Upton Drive
Germany                                           Wilmington, Massachusetts 01887
                                                  USA

Company performing the Pharmacovigilance
in charge of Photonamic:
medac Gesellschaft fuer klinische
Spezialpraeparate mbH
Fehlandtstrasse 3
D-20354 Hamburg
Germany

-------------------------------------------------------------------------------------------
PERSONS RESPONSIBLE FOR PHARMACOVIGILANCE:        PERSON RESPONSIBLE FOR PHARMACOVIGILANCE:
[ * ]                                             [ * ]
[ * ]                                             DUSA Pharmaceuticals, Inc.
medac Gesellschaft fuer klinische                 25 Upton Drive
Spezialpraeparate mbH                             Wilmington, Massachusetts 01887
Theaterstrasse 6                                  e-mail: [ * ]
D-22880 Wedel                                     Phone:    +978-657-7500
Germany                                           Fax:      +978-657-9193
e-mail: drugsafety@medac.de
Phone:  +49 4103 8006 443
Fax:    +49 4103 8006 466
-------------------------------------------------------------------------------------------
</TABLE>

                                      -35-
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                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

The parties agree with this Agreement to be executed by their respective duly
authorized officers or representatives as of the day and year first written
above.

<TABLE>
<S>                                                      <C>
Place, date                                              Place, date

Signature                                                Signature
</TABLE>

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

<TABLE>
<S>                                                      <C>
[ * ]

Person responsible for                                   Person responsible for
Pharmacovigilance                                        Pharmacovigilance
</TABLE>

                                      -36-
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                                                                  EXECUTION COPY

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                   APPENDIX A

                            GENERAL DEVELOPMENT PLAN

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------
                  EVENT                                COMPLETION DATE                    RESPONSIBILITY
--------------------------------------------------------------------------------------------------------
<S>                                                    <C>                                <C>
Phase III Clinical Trial Interim Analysis                   [ * ]                              [ * ]
 - Statistical Tables
--------------------------------------------------------------------------------------------------------
Phase III Clinical Trial - Last patient                     [ * ]                              [ * ]
 completing 6 month follow-up
--------------------------------------------------------------------------------------------------------
Statistical Analysis - Final Tables                         [ * ]                              [ * ]
--------------------------------------------------------------------------------------------------------
Final Phase III Clinical Trial Report                       [ * ]                              [ * ]
--------------------------------------------------------------------------------------------------------
European Regulatory Submission                              [ * ]                              [ * ]
--------------------------------------------------------------------------------------------------------
Manufacturing Process Validation                            [ * ]                              [ * ]
--------------------------------------------------------------------------------------------------------
Stability Studies                                           [ * ]                              [ * ]
--------------------------------------------------------------------------------------------------------
Manufacturing Facilities - ready for FDA                    [ * ]                              [ * ]
 inspection
--------------------------------------------------------------------------------------------------------
Pre-NDA Meeting                                             [ * ]                              [ * ]
--------------------------------------------------------------------------------------------------------
</TABLE>

                                      -37-<PAGE>
                                                                    EXHIBIT 10.2

                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                SUPPLY AGREEMENT

                                     BETWEEN

                           DUSA PHARMACEUTICALS, INC.

                                 AND MEDAC GMBH

                                   DATED AS OF

                                DECEMBER 30, 2002

<PAGE>
                                                                    EXHIBIT 10.2

                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                TABLE OF CONTENTS

<TABLE>
<S>  <C>                                                                    <C>
PRELIMINARY STATEMENTS                                                       1

1.   DEFINITIONS                                                             1

2.   REPRESENTATIONS AND WARRANTIES                                          4

3.   LICENSE AND TRADEMARKS                                                  5

4.   JOINT MANUFACTURING COMMITTEE                                           5

5.   SUPPLY OF PRODUCT                                                       5

6.   PAYMENTS AND REPORTS                                                   10

7.   ADVERSE REACTION REPORTING                                             11

8.   CONFIDENTIALITY                                                        11

9.   INDEMNIFICATIOn                                                        12

10.  INSURANCE                                                              13

11.  TERM; TERMINATION                                                      14

12.  FORCE MAJEURE                                                          15

13.  MISCELLANEOUS                                                          15
</TABLE>

<PAGE>
                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                LIST OF EXHIBITS

<TABLE>
<S>               <C>
EXHIBIT 1.6       THE COMPOUND

EXHIBIT 1.26      THE SPECIFICATIONS

EXHIBIT 5.3       COST OF PRODUCT

EXHIBIT 7.1       DRUG SAFETY AGREEMENT
</TABLE>

                                      -ii-

<PAGE>
                                                                    EXHIBIT 10.2

                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                SUPPLY AGREEMENT

     THIS SUPPLY AGREEMENT (this "Agreement") dated as of December 30, 2002, is
entered into by and between DUSA Pharmaceuticals, Inc., a corporation organized
and existing under the laws of the State of New Jersey, having offices at 25
Upton Drive, Wilmington, Massachusetts 01887 ("DUSA"), and medac Gesellschaft
fur klinische Spezialpraparate mbH, a limited liability company organized and
existing under the laws of the Republic of Germany, having offices located at
Fehlandtstrasse 3, 20354 Hamburg, Germany ("medac").

                             PRELIMINARY STATEMENTS

     WHEREAS, medac has developed, and its newly formed affiliate, Photonamic
GmbH & Co. KG ("PN") owns, and/or has exclusive rights to, certain pre-clinical
and clinical data, technology and know-how in existence as of the Effective Date
relating to the Compound and its use in the Field; and

     WHEREAS, DUSA has developed and owns, and/or has exclusive rights relating
to the Compound in the Territory; and

     WHEREAS, DUSA and medac and PN desire to collaborate on the completion of
the development and commercialization of certain products using the Compound for
application inside and outside the Field and DUSA and PN have entered into a
separate agreement of even date herewith (the "License and Development
Agreement"), all on the terms and conditions set forth in such License and
Development Agreement; and

     WHEREAS, medac wishes to supply DUSA with DUSA's requirements of Products
(as defined below) for use within and outside the Field.

     NOW, THEREFORE, in consideration of the Preliminary Statements and the
mutual agreements and covenants set forth in this Agreement, the Parties agree
as follows:

1.   DEFINITIONS: As used in this Agreement, the following terms shall have the
     meanings set forth in this Section 1 unless context dictates otherwise:

     1.1 "Additional Indication" shall have the meaning assigned to such term in
Section 1.1 of the License and Development Agreement.

     1.2 "Affiliate," shall mean any entity controlling, controlled by, or under
common control with any Party. For these purposes, "control" shall refer to: (i)
the possession, directly or indirectly, of the power to direct the management or
policies of an entity, whether through the ownership of voting securities, by
contract or otherwise, or (ii) the ownership, directly or indirectly, of at
least [ * ] percent ([ * ]%) of the voting securities or other ownership
interest of an entity.

                                      -1-

<PAGE>
                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

     1.3 "Barrett's Indication" shall mean the use of photodynamic therapy for
the treatment of Barrett's esophagus, low grade dysplasia of the esophagus, and
high grade dysplasia of the esophagus.

     1.4 "Breaching Party" shall mean the Party which has materially breached or
defaulted in the performance of any of its material obligations under this
Agreement.

     1.5 "cGMP" shall mean current Good Manufacturing Practice as defined in
Parts 210 and 211 of Title 21 of the U.S. Code of Federal Regulations, as may be
amended from time to time, or any successor thereto.

     1.6 "Compound" shall mean the chemical compound 5-aminolevulinic acid HCl,
as more particularly described on Exhibit 1.6 hereto.

     1.7 "Confidential Information" shall have the meaning assigned to such term
in Section 8.1.

     1.8 "Cost of Product" shall mean the price DUSA has to pay for each unit of
the Product as defined in Section 5.3, which price includes [ * ].

     1.9 "Current Forecast" shall have the meaning assigned to such term in
Section 5.5.

     1.10 "Effective Date" shall mean the date of this Agreement stated above.

     1.11 "FDA" shall mean the United States Food and Drug Administration, or
any successor thereto.

     1.12 "Field" shall mean fluorescence-guided resection of glioblastoma or
other brain cancers.

     1.13 "First Commercial Sale" shall mean, with respect to each Product, the
first sale for which payment has been received for use or consumption by the end
user of such Product in any country in the Territory or ROW by DUSA after all
required Registrations have been granted, or such sale is otherwise permitted,
by the Regulatory Authority in such country, excluding samples, compassionate
use and the like.

     1.14 "Force Majeure" shall have the meaning assigned to such term in
Section 12.

     1.15 "Inability to Supply" shall mean medac's failure for any reason to
adequately supply DUSA's requirements of the Product as required pursuant to
Section 5, [ * ]. [ * ] shall not be deemed an Inability to Supply but shall
oblige medac and DUSA to establish the JMC immediately after the occurrence of
[ * ] in order to ensure a continuing source of supply within the shortest
possible timeframe using commercially reasonable best efforts.

     1.16 "Initial Term" shall have the meaning assigned to such term in Section
11.1.

     1.17 "Invention" shall mean any new or useful process, manufacture,
compound or composition of matter relating to the production of the Compound or
a Product (including, without limitation, the formulation, delivery or use
thereof in the Field), whether patentable or unpatentable, or any improvement
thereof, that is conceived or first reduced to practice or demonstrated to have
utility during the term of this Agreement.

                                      -2-
<PAGE>
                                                                  EXECUTION COPY

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BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

     1.18 "Joint Manufacturing Committee" or "JMC" shall mean the committee the
Parties shall establish to oversee the manufacturing activities and formulate
strategic manufacturing and capacity plans.

     1.19 "Know-how" shall mean any and all Inventions, improvements,
discoveries, claims, formulae, processes, trade secrets, technologies and skill
(including confidential data and Confidential Information), whether patented or
unpatented, patentable or unpatentable, that is generated, owned or controlled
by medac at any time before or during the Term of this Agreement relating to,
derived from, or useful for the manufacture, use or sale of the Compound or the
Product(s) in any country in the Territory or ROW, including, without
limitation, synthesis, preparation, recovery and purification processes and
techniques, control methods and assays, chemical data, toxicological and
pharmacological data and techniques, clinical data, medical uses, product
formulae and formulations, manufacturing processes and methods and
specifications.

     1.20 "Manufacturing License" shall have the meaning assigned to such term
in Section 5.12.

     1.21 "Manufacturing Standards" shall mean, with respect to any Product,
cGMP and such additional manufacturing specifications or standards as may be
established by any Regulatory Authority from time to time, it being understood
that at the Effective Date, the FDA has not inspected medac's suppliers with
respect to their manufacture of the Product.

     1.22 "Party" shall mean DUSA or medac and, when used in the plural, shall
mean DUSA and medac.

     1.23 "Product" shall mean, individually or collectively, the [ * ]
formulation of the Compound currently in medac's clinical trials in the Field,
any [ * ] formulations of the Compound and/or the [ * ] formulation of the
Compound to be developed pursuant to the Development Program (as defined and
described in the License and Development Agreement), as appropriate in the
context of the reference.

     1.24 "Regulatory Authority" shall mean the FDA in the U.S., and any health
regulatory authority(ies) in any country in the Territory or ROW that is a
counterpart to the FDA and holds responsibility for granting regulatory
marketing approval for a Product in such country, and any successor(s) thereto
and any other state or local health regulatory authorities having jurisdiction
for any activities contemplated by the Parties.

     1.25 "Renewal Term" shall have the meaning assigned to such term in Section
11.1.

     1.26 "Specifications" shall mean, with respect to each formulation of the
Product, the specifications for such formulation of the Product and such other
packaging and labeling specifications as mutually agreed upon by the Parties, in
writing, and attached hereto and made a part hereof as Exhibit 1.26, as may be
amended from time to time.

     1.27 "Substitute Manufacturer" shall have the meaning assigned to such term
in Section 5.11.1.

     1.28 "Term" shall have the meaning assigned to such term in Section 11.1.

     1.29 "Territory" shall mean all the United States, [ * ]; provided that,
for each individual country, [ * ] at any time prior to or during the Term of
this Agreement.

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

     1.30 "Testing Methods" shall have the meaning assigned to such term in
Section 5.7.3.

     1.31 "Third Party" shall mean any person who or which is neither a Party
nor an Affiliate of a Party.

     1.32 "Third Party Manufacturer" shall have the meaning assigned to such
term in Section 5.9.1.

     1.33 "Trademarks" shall have the meaning assigned to such term in Section
3.2.

     1.34 "United States" or "U.S." shall mean the United States of America,
including its possessions and territories.

     1.35 "ROW" shall mean the countries of the world other than the countries
in the Territory.

     Unless otherwise provided in the Supply Agreement, capitalized terms not
defined herein shall have the meaning assigned to them in the License and
Development Agreement.

2.   REPRESENTATIONS AND WARRANTIES.

     2.1 Representations and Warranties of Both Parties: Each Party represents
and warrants to the other Party, as of the Effective Date, that:

          2.1.1 such Party is duly organized, validly existing and in good
standing under the laws of the jurisdiction of its incorporation and has full
corporate power and authority to enter into this Agreement and to carry out the
provisions hereof;

          2.1.2 such Party is free to enter into this Agreement;

          2.1.3 by entering into this Agreement, such Party will not violate any
other agreement to which it is a party; and

          2.1.4 such Party has taken all corporate action necessary to authorize
the execution and delivery of this Agreement and the performance of its
obligations under this Agreement.

     2.2 Representations and Warranties of medac. medac represents and warrants
to DUSA, as of the Effective Date, that:

          2.2.1 during the Term of this Agreement, medac shall not [ * ] the
Product [ * ] the Field to any Third Party in the Territory on terms [ * ] and
medac shall not [ * ] the Product [ * ] the Field to any Third Party in the
Territory as it is [ * ] licensed to DUSA under the License and Development
Agreement;

          2.2.2 medac is the owner of, or has exclusive rights to, all of the
Know-how in existence on the Effective Date, and has the exclusive right to
grant the licenses granted under this Agreement;

          2.2.3 to the best of medac's knowledge, DUSA's commercialization of
the Compound and/or the Product in the Field, in accordance with the terms of
this Agreement, [ * ] any patent or other proprietary rights in the Territory of
any Third Party; and

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          2.2.4 medac shall cause its suppliers to continue to work towards
meeting cGMP as soon as practicable, and medac shall perform or cause to be
performed, those activities assigned to it under this Agreement in compliance
with cGMP as promulgated by the respective Regulatory Authorities;

     2.3 Representations and Warranties of DUSA. DUSA represents and warrants to
medac, as of the Effective Date, that:

          2.3.1 DUSA shall use its commercially reasonable best efforts to
perform its obligations under this Agreement; and

          2.3.2 DUSA shall perform such obligations in a manner commensurate
with professional standards generally applicable in its industry.

3.   LICENSE AND TRADEMARKS.

     3.1 Commercialization License: medac hereby grants to DUSA an [ * ] license
throughout the Territory, and a [ * ] license in the ROW where DUSA is
purchasing Product according to Section 5.2, with the right to grant
sublicenses, under the Know-how, to use, register, market and sell Products
purchased by DUSA under this Agreement; provided, however, that no license to
manufacture the Product shall be deemed granted unless the events described in
Section 5.11 have occurred.

     3.2 Trademarks: DUSA shall market the Products throughout the Territory and
in the ROW under a trademark or trademarks (collectively, the "Trademarks")
selected by DUSA. Except as otherwise expressly provided in this Agreement, DUSA
shall own all right, title and interest in and to such Trademarks. All labeling
and packaging for all Products to be marketed and sold in the Territory or ROW
shall contain the DUSA name or logo not exceeding the prominence of the medac
name or logo, should medac's name be required.

4.   JOINT MANUFACTURING COMMITTEE.

     The Parties may, from time to time, as they deem appropriate, establish a
Joint Manufacturing Committee to oversee the manufacturing activities and
formulate strategic manufacturing and capacity plans relating to the production
of the Product, including without limitation with respect to addressing an
Inability to Supply and including without limitation a Force Majeure. Either
Party may request a meeting of the JMC. The JMC will consist of two (2)
representatives from each Party. Decisions of the JMC shall be by consensus,
with each Party having, collectively, one (1) vote; provided, however, that if
the JMC cannot reach agreement on a matter, the dispute shall be referred to a
designated senior executive officer of each Party, who shall meet promptly and
negotiate in good faith to resolve the dispute.

5.   SUPPLY OF PRODUCT.

     5.1 Supply in the Field: DUSA shall purchase the Product [ * ] from medac
and medac shall supply DUSA with [ * ] the Product for [ * ] use in the Field in
the Territory pursuant to Section 5.5.

     5.2 Supply outside the Field: If DUSA, during the term of this Agreement,
desires to purchase the Product from medac for other indications outside the
Field, the Parties agree to negotiate the terms and conditions for supply of
such Product in good faith. medac agrees to advise

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DUSA, in writing, whether or not medac will agree to supply Product to DUSA for
its development and commercial needs of any Additional Indication, consistent
with the provisions of this Agreement. The Parties also acknowledge and agree
that medac shall supply DUSA [ * ] use in the Barrett's Indication pursuant to
Section 5.5. For purposes of clarity, the parties agree that this Agreement
shall not [ * ] 5-aminolevulinic acid [ * ].

     5.3 Cost of Product: The cost to DUSA for Product supplied by medac under
this Agreement shall be [ * ] per unit, as described on Exhibit 5.3 (the "Cost
of Product"), subject to the volume pricing schedule also contained on Exhibit
5.3. The Cost of Product shall remain fixed for [ * ] following the First
Commercial Sale and thereafter may be adjusted [ * ] per following consecutive
year, provided that, medac gives DUSA at least [ * ] prior written notice of any
increase. Such increase shall be limited to the [ * ] during the preceding year.

     5.4 Forecasts: Commencing [ * ] months prior to any anticipated need for
clinical supplies or commencing [ * ] months prior to the anticipated commercial
launch of a Product in any country in the Territory or ROW, and no later than
[ * ], DUSA shall provide medac with a [ * ] forecast of estimated quantities in
units, [ * ] anticipated delivery schedules [ * ] for the following twelve (12)
month period (i.e., Q1 and the next three calendar quarters ("Q2," "Q3" and
"Q4," respectively)), by calendar quarters [ * ]. Such forecasts shall be
revised and updated quarterly.

     5.5 Orders: Together with each forecast provided under Section 5.4 (the
"Current Forecast"), DUSA shall place its firm order, if any, with medac,
setting forth units, by formulation, delivery dates and shipping instructions
with respect to each shipment of Product for delivery in Q1 of the Current
Forecast. medac shall accept such orders from DUSA, subject to the other terms
and conditions of this Agreement. DUSA's orders shall be made pursuant to
purchase orders which are in a form mutually acceptable to the Parties, to the
extent that such form is not inconsistent with the terms of this Agreement.

          5.5.1 Notwithstanding Section 5.5, DUSA shall, commencing with the
First Commercial Sale of the Product, place firm orders with medac for Period 1
and Period 2 below, (each period being successive twelve (12) month periods
following the date of the First Commercial Sale) for all formulations of
Product(s) which, in the aggregate, shall not be less than the amounts set forth
in the following table. During the third quarter of Period 2, the parties agree
to negotiate the minimum firm order requirements for Periods 3, and 4, in good
faith, based upon [ * ] in Periods 3 and 4, which shall be prepared by the
Parties at such time. Notwithstanding the preceding, the minimum firm orders to
be set for Period 3 shall be the greater of (a) the [ * ] ordered during (i)
Period 1, and (ii) the first two (2) quarters of Period 2 or (b) [ * ] units.
Thereafter, the parties shall negotiate the minimum firm order requirements for
each successive two (2) year period during the third quarter of the last period
for which minimum firm orders have been established (i.e., Periods 5 and 6 in
the third quarter of Period 4; Periods 7 and 8 in the third quarter of Period 6;
etc.), in good faith, based upon [ * ] in such two (2) year period, which shall
be prepared by the Parties at the time such minimum firm orders are to be set;
which in no case shall be less than [ * ] units.

<TABLE>
<CAPTION>
----------------------------------------------------
PERIOD                          AGGREGATE UNITS
<S>                             <C>
----------------------------------------------------
   1                                  [ * ]
----------------------------------------------------
</TABLE>

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<S>                             <C>
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----------------------------------------------------
   3                                  [ * ]
----------------------------------------------------
   4                                  [ * ]
----------------------------------------------------

----------------------------------------------------
</TABLE>

          5.5.2 In the event that DUSA submits orders for Product with respect
to any twelve (12) month period following the date of the First Commercial Sale
for less than the minimum quantity of Product that DUSA is required to purchase
under this Section 5, then:

                (a)  DUSA shall [ * ] within thirty (30) days of the end of
                     such twelve (12) month period, the [ * ] and (ii) the [ * ]
                     to medac upon the purchase of the minimum quantities set
                     forth above; and

                (b)  the Parties shall negotiate, in good faith, [ * ] which
                     have been set by the Parties prior to the shortfall.

     5.6 Delivery: medac shall [ * ] to ship quantities of Product that medac is
obligated to supply pursuant to Section 5.5 on the dates specified in DUSA's
purchase orders submitted and accepted in accordance with Section 5.5 and [ * ].
All Product delivered pursuant to the terms of this Agreement shall be suitably
packed for shipment by medac, marked for shipment to the destination point
indicated in DUSA's purchase order, and shall be accompanied by the
documentation specified in Section 5.7. DUSA shall designate only one (1)
shipping destination in each country in the Territory or ROW at least thirty
(30) days prior to launch of a Product in such country. All shipments of Product
shall be [ * ] at the relevant DUSA site. The carrier shall be selected by
medac. The shipping packaging used by medac shall be in accordance with good
commercial practice with respect to protection of the Product during
transportation. All shipping shall be [ * ]. medac will be responsible for [ * ]
of the Products during the transportation [ * ]. Notwithstanding the language in
this Section 5.6, the parties recognize that medac may not [ * ] the Product
[ * ], or DUSA may wish to [ * ] in the United States. Therefore, medac and DUSA
shall decide no later than the date of issuance of the final report by PN to
DUSA of the Phase III Clinical Trial which Party, [ * ] the Product or whether a
Third-Party should be engaged [ * ]. Should DUSA [ * ], the parties agree to
[ * ] to reflect the added responsibility of DUSA.

     5.7 Conformity; Specifications; Quality Control; Inspections:

          5.7.1 Subject to Section 1.15, medac shall ensure that all quantities
of Product supplied by medac, or any Third-Party Manufacturers, pursuant to this
Section 5.7.1 will comply with the Specifications and applicable Manufacturing
Standards as demanded by the FDA or the corresponding Regulatory Authority in
the Territory or ROW and shall ensure that it and its Third-Party Manufacturers
adhere to all applicable governmental laws and regulations relating to the
manufacture, sale and shipment of Product at the time it is shipped by medac to
DUSA. With respect to clinical supplies, medac will comply with the FDA
Guidelines represented in its memorandum entitled "Human Drug cGMP Notes"
(Volume 7, Number 3) dated September, 1999, as may be amended by FDA.
Furthermore, medac shall file and maintain with the FDA the Drug Master File
("DMF") under which medac manufactured clinical supplies of the Product during
all times that the FDA requires such DMF. medac agrees that it will notify DUSA
[ * ] of incidents pertaining to the manufacture of the Product that would
require notification to the

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AMENDED.

FDA. medac shall provide written notice to DUSA of any supplement or amendment
to any DMF covering the Product prior to filing such document with the FDA.

          5.7.2 DUSA shall have the right to change the Specifications, from
time to time, to accommodate the demands or requests of the FDA or the
corresponding Regulatory Authority in the Territory or ROW at any time during
the term of this Agreement on not less than [ * ] prior written notice to medac.
medac shall [ * ] such changes, provided that DUSA agrees [ * ] in implementing
such additional standards and specifications (i.e., in addition to the Cost of
Product) medac shall be entitled to include [ * ] submitted to DUSA pursuant to
Section 6.1, from time to time. In addition, changes to the Specifications other
than those required by any Regulatory Authority shall be made only upon the
mutual consent of the Parties.

          5.7.3 medac shall conduct, or cause to be conducted [ * ], quality
control testing of Product prior to shipment, in accordance with the
Specifications and applicable Manufacturing Standards as are in effect from time
to time and such other quality control testing procedures agreed to by the
Parties from time to time (collectively, the "Testing Methods"). medac or its
designee shall retain records pertaining to such testing. Each shipment of
Product hereunder shall be accompanied by a certified quality control protocol
and certificate of analysis for each lot of Product therein as well as such
customs and other documentation as is necessary or appropriate.

          5.7.4 medac shall provide to DUSA (i) [ * ], copies of results of
initial stability testing for any batch of Product manufactured during the
preceding quarter, and (ii) copies of all ongoing stability test data on a
quarterly basis. Any significant trends should be promptly reported.

          5.7.5 DUSA shall have the right, at reasonable times and upon
reasonable notice, to inspect all facilities at which Product is manufactured
pursuant to this Section 5.7.5, (i) as may be required by said Regulatory
Authorities, such as annual cGMP audits pursuant to 21 CFR 211, (ii) in order to
conduct a pre-approval inspection prior to filing a Registration Application in
any country in the Territory or ROW, (iii) as part of a pre-inspection prior to
any scheduled inspection by a Regulatory Authority, and/or (iv) for compliance
with regulatory requirements in the event any Product fails to meet the
Specifications, if and as far as required by the Regulatory Authorities. medac
shall permit representatives of any Regulatory Authority to gain access to
medac's facilities, books and records and shall cause any Third-Party
Manufacturer to allow access to such Third-Party Manufacturer's facilities,
books and records as may be necessary or required. medac shall notify DUSA as
soon as medac becomes aware of any proposed inspection and promptly provide DUSA
with copies of any reports or observations made by such Regulatory Authorities.

          5.7.6 medac agrees to retain samples of the Product in accordance with
the requirements of the FDA as set forth in 21 CFR 211.170, as may be amended
from time to time, or any other applicable Regulatory Authority. DUSA agrees
[ * ] associated with such compliance. [ * ] by DUSA within [ * ] from receipt
of medac's [ * ] for same which shall include [ * ] as may be necessary to
support [ * ].

     5.8 Acceptance/Rejection; Interim Replacement:

          5.8.1 DUSA shall test or cause to be tested Product supplied under
this Section 5 in accordance with DUSA's customary procedures within [ * ] days
of its receipt at DUSA's facilities or that of its designee. DUSA or its
designee shall have the right to reject within said [ * ] days any shipment of
Product made to it under this Agreement that does not meet the Specifica-

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AMENDED.

tions and applicable Manufacturing Standards when received by it at such
destination when tested in accordance with the Testing Methods.

          5.8.2 All claims of non-conforming Product shall be accompanied by a
report of analysis (including a sample of the Product from the shipment
analyzed) of the allegedly non-conforming Product that shall have been made by
DUSA or its designee, using the Testing Methods.

          5.8.3 If medac does not reasonably agree that the Product is
non-conforming, the report of analysis referenced in Section 5.8.2 above shall
be referred to the JDC (under the License and Development Agreement), and the
resolution of the matter shall be determined according to Section 3.4 of the
License and Development Agreement.

          5.8.4 Notwithstanding any other provision of this Agreement, DUSA
shall not be required [ * ] of Product that [ * ], but DUSA shall be obligated
to [ * ]. In the event that DUSA pays for a shipment of Product and subsequently
rejects such shipment in accordance with the terms of this Agreement, DUSA shall
be entitled to [ * ] with respect to such rejected shipment. Any such [ * ] to
medac from DUSA.

     5.9 [ * ]:

          5.9.1 The Parties acknowledge and agree that medac currently [ * ] for
the Compound and intends to satisfy its supply obligations to DUSA hereunder
through [ * ]. medac shall ensure that all such [ * ] comply with the applicable
Manufacturing Standards in effect from time to time.

          5.9.2 In the event that medac intends to make arrangements to
manufacture Product and/or its components, perform services or supply facilities
or goods (including, without limitation, the Compound) in connection with the
manufacture, testing and/or packaging of the Product [ * ], medac shall
immediately notify DUSA thereof. DUSA may call a meeting of the JMC to discuss
the matter in order to provide compliance with Regulatory Authorities and to
ensure a secure source of supply of Product to DUSA.

          5.9.3 medac acknowledges and agrees that [ * ] shall be subject to
Section 5.7. and that use of [ * ] the Product shall not relieve medac of its
obligations under Section 5.7.

     5.10 Shortage of Supply:

          5.10.1 medac shall notify DUSA: (i) as promptly as possible, but in no
event more than [ * ] after medac's receipt of a firm order from DUSA as
provided in Section5.5, or (ii) immediately upon becoming aware of an event of
Force Majeure under Section 12 or any other event that would render medac unable
to supply the quantity of Product to DUSA that medac is required to supply
hereunder, if medac is unable to supply such quantities of Product. In such
event, medac shall [ * ] to remedy such shortage.

          5.10.2 In the event that medac is unable to supply both DUSA's
requirements of Product and medac's and Third Parties' requirements for Product
due to Force Majeure or otherwise, medac shall [ * ], so that DUSA receives at
least [ * ] of such available supplies, as determined from reasonable forecasts
(taking into consideration past sales and sales performance against forecast)
for the Product.

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COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

          5.10.3 In addition to any other remedies set forth in this Agreement,
medac agrees that if it [ * ] of Products and a shortage of supply to DUSA, any
of its Affiliates or sublicensees, if any, results, medac shall [ * ].

     5.11 Inability to Supply; Election of Remedies.

          5.11.1 In the event of an Inability to Supply [ * ], the Parties shall
establish a JMC within [ * ] of the first such occurrence so that the Parties
may resolve the situation as quickly as reasonably possible. If [ * ] days after
formation of the JMC, medac has not been able to cure its Inability to Supply
[ * ] DUSA may (i) [ * ] giving [ * ] days notice under Section 11.4.2 or (ii)
[ * ] DUSA's requirements for the Product under this Agreement. In this case,
medac shall grant the Manufacturing License to DUSA to manufacture Product
either itself and/or by its Substitute Manufacturer. The Manufacturing License
shall continue until such time as medac [ * ], not to exceed [ * ] years.

          5.12 Right to Manufacture: In the event that DUSA is entitled to
manufacture (or have manufactured) the Product under Section 5.11, medac hereby
grants to DUSA, and DUSA hereby accepts, [ * ] license (a "Manufacturing
License") under the Know-How and Licensed Technology necessary to make, have
made, use and sell Product for such of DUSA's requirements (and the requirements
of its Affiliates and sublicensees) in the Territory or ROW. Such Manufacturing
License shall be subject to all other terms and conditions of this Agreement. In
such event: (i) medac shall provide to DUSA copies of all documentation within
medac's possession and control that is reasonably necessary for DUSA to
manufacture (or have manufactured) Product, including its DMF; (ii) upon DUSA's
need to utilize such Manufacturing License, medac shall provide such technical
assistance within medac's possession and control to DUSA as is reasonably
necessary to enable DUSA to manufacture (or have manufactured) Product in
accordance with the Specifications and Manufacturing Standards; (iii) to the
extent that DUSA manufactures (or has manufactured) Product pursuant to the
Manufacturing License, DUSA shall be [ * ]; (iv) medac shall reasonably
cooperate with DUSA to establish an alternative supply, including locating
qualified Third Party Manufacturers and sources of materials; and (v) medac
shall [ * ], as well as any other information which is necessary or desirable in
order for DUSA to make full use of the Manufacturing License provided under this
Section 5.12.

          5.13 Inventory: In order to minimize the consequences of a Inability
to Supply to the Parties, medac shall maintain in inventory a supply of raw
materials or finished product equal to [ * ].

6.   PAYMENTS AND REPORTS.

     6.1 Payments: medac shall submit invoices to DUSA for the Cost of Product
promptly after each shipment of Product. Except as provided in Section 5.8,
payments shall be made by DUSA without any deduction within thirty (30) days
after the invoice date.

     6.2 Mode of Payment: All invoices submitted by medac shall be stated [ * ].
DUSA shall make all payments required under this Agreement as directed by medac
from time to time, net of [ * ].

     6.3 Taxes:

          6.3.1 In the event that DUSA is required to withhold any tax to the
tax or revenue authorities in any country in the Territory or ROW regarding any
payment to medac due to the

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laws of such country, such amount shall be deducted from the payment to be made
by DUSA, and DUSA shall promptly notify medac of such withholding and, within a
reasonable amount of time after making such deduction, furnish medac with copies
of any tax certificate or other documentation evidencing such withholding. Each
Party agrees to cooperate with the other Party in claiming exemptions from such
deductions or withholdings under any agreement or treaty from time to time in
effect.

          6.3.2 If medac has the legal obligation to collect and/or pay any
sales, use, excise or value added taxes, the appropriate amount shall be added
to DUSA's invoice and paid by DUSA, unless DUSA provides medac with a valid tax
exemption certificate authorized by the appropriate taxing authority.

7.   ADVERSE REACTION REPORTING.

     7.1 Each Party responsible for any regulatory compliance relating to the
Compound or Product agrees to comply with the Drug Safety Agreement ("DSA")
attached to and made a part of this Agreement as Exhibit 7.1; provided, however,
if there are any ambiguities or inconsistencies between the terms of the DSA and
the requirements of a Regulatory Authority, or if the requirements of a
Regulatory authority are more stringent in any respect, then the provisions,
rules and regulations of the Regulatory Authority shall apply and the Parties
shall cooperate with each other in order that compliance occurs in a timely
manner.

     7.2 Investigation, Recall: In the event that the Regulatory Authority in
any country in the Territory or ROW shall allege or prove that the Product does
not comply with applicable rules and regulations in such country, DUSA shall
notify medac immediately and both Parties shall cooperate fully regarding the
investigation and disposition of any such matter. If DUSA is required or should
deem it appropriate to recall the Product and such recall is due to any
negligence, recklessness or wrongful intentional acts or omissions by, or strict
liability of, or breach of representation and warranty including, but not
limited to, non-compliance with cGMP, by, medac, then and in such event medac
shall bear all reasonable [ * ] associated with such recall, [ * ]. Otherwise,
DUSA shall [ * ].

8.   CONFIDENTIALITY.

     8.1 Use; Non-Disclosure: Each Party shall maintain strict confidentiality
of all commercial, scientific, medical and technical information and knowledge
acquired in the performance of this Agreement or disclosed by one Party to the
other Party during the Term ("Confidential Information") and shall use such
Confidential Information only for the purposes intended by this Agreement. Both
Parties shall obligate their affiliates, directors, employees, officers,
representatives and agents to respect said confidentiality. The obligations of
the Parties under this Section 8 shall survive the expiration of this Agreement,
or termination of this Agreement regardless the manner of such termination, for
a period of [ * ] years.

     8.2 Exclusions: The foregoing obligations shall not apply to any
information which:

          8.2.1 was known by the receiving Party as evidenced by its prior
written records prior to the time it was received from the disclosing Party;

          8.2.2 was known to the public or generally available to the public
prior to the time it was received by the receiving Party;

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[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

          8.2.3 becomes known to the public or generally available to the public
without the receiving Party being responsible therefor;

          8.2.4 was received by the receiving Party at any time from a Third
Party who is under no obligation to maintain the confidentiality of such
information;

          8.2.5 was independently developed by the receiving Party and can be
shown to have been so developed without reliance on or with reference to any
Confidential Information from the disclosing Party.

     8.3 Permitted Disclosure: The obligations under this Section 8 shall not
hinder the receiving Party from forwarding to the appropriate governmental
authorities including, but not limited to, the Regulatory Authorities, any
Confidential Information that has to be disclosed in connection with
registration and/or sale or use of the Product.

     8.4 Exceptions to Obligation: The restrictions contained in Section 8.1
shall not apply to Confidential Information that: (i) is submitted by the
recipient to governmental authorities to facilitate the issuance of
Registrations for the Product, provided that reasonable measures shall be taken
to assure confidential treatment of such information; (ii) is provided by the
recipient to Third Parties under confidentiality provisions at least as
stringent as those in this Agreement, for consulting, manufacturing development,
manufacturing, external testing, clinical marketing trials and, with respect to
DUSA, to Third Parties who are sublicensees or other development/marketing
partners of DUSA with respect to any of the subject matter of this Agreement; or
(iii) is otherwise required to be disclosed in compliance with applicable laws
or regulations or order by a court or other regulatory body having competent
jurisdiction; provided that if a Party is required to make any such disclosure
of the other Party's Confidential Information such Party will, except where
impracticable for necessary disclosures (for example, to physicians conducting
studies or to health authorities), give reasonable advance notice to the other
Party of such disclosure requirement and, except to the extent inappropriate in
the case of patent applications, will use its best efforts to secure
confidential treatment of such Confidential Information required to be
disclosed.

     8.5 Limitations on Use: Each Party shall limit the use, and cause each of
its Affiliates and its sublicensees, if any, to limit the use, of any
Confidential Information obtained by such Party from the other Party, its
Affiliates or its sublicensees, pursuant to this Agreement or otherwise, so that
such use is solely in connection with the activities or transactions
contemplated hereby.

     8.6 Remedies: Each Party shall be entitled, in addition to any other right
or remedy it may have, at law or in equity, to an injunction, without the
posting of any bond or other security, enjoining or restraining the other Party,
its Affiliates and/or its sublicensees from any violation or threatened
violation of this Section 8.

9.   INDEMNIFICATION

     9.1 Indemnification by DUSA: DUSA shall indemnify, keep indemnified, defend
and hold harmless medac and its Affiliates, and their respective directors,
officers, employees and agents, from and against [ * ] howsoever arising,
whether in tort, contract or as a result of breach of statutory duty or
otherwise and whether or not foreseeable [ * ] arising out of or resulting from:

                                      -12-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

          9.1.1 negligence, recklessness or wrongful intentional acts or
omissions of DUSA, its Affiliates or its sublicensees, if any, and their
respective directors, officers, employees and agents, in connection with DUSA's
fulfillment of its obligations under this Agreement;

          9.1.2 any breach of any representation or warranty made by DUSA under
this Agreement.

     9.2 Indemnification by medac: medac shall indemnify, keep indemnified,
defend and hold harmless DUSA, its Affiliates, its sublicensees and
distributors, and their respective directors, officers, employees and agents,
from and against [ * ] howsoever arising, whether in tort, contract or as a
result of breach of statutory duty or otherwise and whether or not foreseeable
[ * ] arising out of or resulting from:

          9.2.1 negligence, recklessness or wrongful intentional acts or
omissions of medac or its Affiliates, and their respective directors, officers,
employees and agents, in connection with medac's fulfillment of its obligations
under this Agreement;

          9.2.2 any warranty claims, Product recalls or any tort claims of
personal injury (including death) or property damage relating to or arising out
of any manufacture, use, distribution or sale of the Compound or the Product by
medac or its Affiliates due to any negligence, recklessness or wrongful
intentional acts or omissions by, or strict liability of medac or its
Affiliates, and their respective directors, officers, employees and agents,
except, in each case, to the comparative extent such claim arose out of or
resulted from any negligence, recklessness or wrongful intentional acts or
omissions by, or strict liability of DUSA, its Affiliates or its sublicensees,
and their respective directors, officers, employees and agents; or

          9.2.3 any breach of any representation or warranty made by medac under
Section 2.

     9.3 Notice of Indemnification: In the event that any person (an
"Indemnitee") entitled to indemnification under Section 9.1 or Section 9.2 is
seeking such indemnification, such Indemnitee shall inform the indemnifying
Party of the claim as soon as reasonably practicable after such Indemnitee
receives notice of such claim, shall permit the indemnifying Party to assume
direction and control of the defense of the claim (including the sole right to
settle it at the sole discretion of the indemnifying Party, provided that such
settlement does not impose any obligation on, or otherwise adversely affect, the
Indemnitee or the other Party) and shall cooperate as requested (at the expense
of the indemnifying Party) in the defense of the claim.

     9.4 Complete Indemnification: As the Parties intend complete
indemnification, all costs and expenses incurred by an Indemnitee in connection
with enforcement of Sections 9.1 and 9.2 shall also be reimbursed by the
indemnifying Party.

10.  INSURANCE

     Both parties shall obtain by the date of the first purchase of Product
under this Agreement and shall continue to maintain, at its cost, so long as the
Product is commercialized in the Territory or wherever sold in the ROW, a
general liability/product liability insurance policy providing coverage of
[ * ]. Both parties shall alternatively have the right to satisfy the obligation
for any insurance under this Section 10 through a reasonable program of
self-insurance. Both Parties shall provide written evidence of such insurance
coverage to the other Party upon request.

                                      -13-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

11.  TERM; TERMINATION

     11.1 Term: This Agreement shall become effective as of the Effective Date
and shall remain in full force and effect for a period of [ * ] from the date of
receipt of the First Commercial Sale in any country in the Territory, unless
earlier terminated pursuant to one of the other provisions of Section 11 (the
"Initial Term"). Following expiration of the Initial Term the Agreement shall be
automatically renewed for successive one (1) year renewal periods (each, a
"Renewal Term"); provided, however, that at any time following expiration of the
Initial Term either Party shall have the right to terminate this Agreement upon
[ * ] written notice (The Initial Term and all Renewal Terms, or parts thereof,
collectively, the "Term").

     11.2 Termination for Insolvency: Notwithstanding the language contained in
Section 11.1, each Party is entitled to terminate this Agreement giving [ * ]
days notice in the event that the other Party is adjudicated insolvent, a
receiver or trustee is appointed for substantially all of its assets a Party
makes a general assignment for the benefit of its creditors or the Party enters
into liquidation.

     11.3 Termination for Cause: Either Party (the "Non-breaching Party") may,
without prejudice to any other remedies available to it at law or in equity,
terminate this Agreement, in whole or in part, in the event the other Party (the
"Breaching Party") shall have materially breached or defaulted in the
performance of any of its material obligations hereunder, and such default shall
have continued for [ * ] days after written notice thereof was provided to the
Breaching Party by the Non-breaching Party (or, if such default cannot be cured
within such [ * ] period, if the Breaching Party does not commence and
diligently continue actions to cure such default during such [ * ]day period).
Any such termination shall become effective at the end of such [ * ]day period
unless the Breaching Party has cured any such breach or default prior to the
expiration of such [ * ]day period (or, if such default cannot be cured within
such [ * ]day period, if the Breaching Party has commenced and diligently
continued actions to cure such default). The right of either Party to terminate
this Agreement as provided in this Section 11.3 shall not be affected in any way
by such Party's waiver or failure to take action with respect to any previous
default.

     11.4 Termination for Other Reasons:

          11.4.1 DUSA may terminate this Agreement under Section 5.11 by giving
medac [ * ] days prior written notice.

          11.4.2 DUSA may terminate this Agreement for any reason by giving
medac [ * ] prior written notice, provided that such notice may not be given
unless DUSA has provided notice of termination to PN, under the License and
Development Agreement under Section 13 thereof.

     11.5 Effect of Expiration or Termination: Following any termination by DUSA
or the expiration of the Term of this Agreement, medac shall, for a period of
[ * ], continue to provide DUSA with its requirements of any formulation of the
Product for use in the Field and in the Barrett's Indication and for use in any
other indications agreed to between the parties pursuant to Section 5.2., if
applicable, in accordance with the provisions of Section 5.

     11.6 Accrued Rights; Surviving Obligations:

                                      -14-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

          11.6.1 Termination, relinquishment or expiration of this Agreement for
any reason shall be without prejudice to any rights that shall have accrued to
the benefit of either Party prior to such termination, relinquishment or
expiration. Such termination, relinquishment or expiration shall not relieve
either Party from obligations which are expressly indicated to survive
termination or expiration of this Agreement.

12.  FORCE MAJEURE

     Neither Party shall be held liable or responsible to the other Party nor be
deemed to be in default under, or in breach of any provision of, this Agreement
for failure or delay in fulfilling or performing any obligation of this
Agreement when such failure or delay is due to Force Majeure, and without the
fault or negligence of the Party so failing or delaying. For purposes of this
Agreement, Force Majeure is defined as causes beyond the control of the Party,
including, without limitation, acts of God; acts, regulations, or laws of any
government; war; civil commotion; destruction of production facilities or
materials by fire, flood, earthquake, explosion or storm; labor disturbances;
epidemic; and failure of public utilities or common carriers. In such event DUSA
or medac, as the case may be, shall immediately notify the other Party of such
inability and of the period for which such inability is expected to continue.
The Party giving such notice shall thereupon be excused from such of its
obligations under this Agreement as it is thereby disabled from performing for
so long as it is so disabled and the thirty (30) days thereafter. To the extent
possible, each Party shall use reasonable efforts to minimize the duration of
any Force Majeure.

13.  MISCELLANEOUS

     13.1 Relationship of Parties: Nothing in this Agreement is intended or
shall be deemed to constitute a partnership, agency, employer-employee or joint
venture relationship between the Parties. No Party shall incur any debts or make
any commitments for the other, except to the extent, if at all, specifically
provided herein.

     13.2 Assignment: Neither Party shall be entitled to assign its rights
hereunder without the express written consent of the other Party hereto, except
that each Party may assign its rights and transfer its duties hereunder to any
assignee of all or substantially all of its business (or that portion thereof to
which this Agreement relates), in the event of such Party's merger,
consolidation or involvement in a similar transaction or in the event of the
purchase of in excess of fifty percent (50%) of the voting securities of a Party
by such assignee. No assignment and transfer shall be valid or effective unless
done in accordance with this Section 13.2 and unless and until the
assignee/transferee shall agree in writing to be bound by the provisions of this
Agreement.

     13.3 Books and Records: Any books and records to be maintained under this
Agreement by a Party or its Affiliates or sublicensees shall be maintained in
accordance with the generally accepted accounting principles of each such
Party's country of formation, consistently applied.

     13.4 Further Actions: Each Party shall execute, acknowledge and deliver
such further instruments, and do all such other acts, as may be necessary or
appropriate in order to carry out the purposes and intent of this Agreement.

     13.5 Notices:

          13.5.1 Any notice or request required or permitted to be given under
or in connection with this Agreement shall be deemed to have been sufficiently
given if in writing and personally

                                      -15-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

delivered or sent by certified mail (return receipt requested), facsimile
transmission (receipt verified), or overnight express courier service (signature
required), prepaid, to the Party for which such notice is intended, at the
address set forth for such Party below:

          In the case of DUSA, to:

               DUSA Pharmaceuticals, Inc.
               25 Upton Drive
               Wilmington, Massachusetts 01887
               Attention:  D. Geoffrey Shulman, President
               Facsimile No.: 978-657-9193
               Telephone No.: 978-657-7500

          In the case of medac, to:

               medac GmbH
               Fehlandstrasse 3
               20354 Hamburg
               Attention: Jorg Hans, Managing Director
               Facsimile No.: 0049-4103-8006-100
               Telephone No.: 0049-4103-8006-521

or to such other address for such Party as it shall have specified by like
notice to the other Party, provided that notices of a change of address shall be
effective only upon receipt thereof. If delivered personally or by facsimile
transmission, the date of delivery shall be deemed to be the date on which such
notice or request was given. If sent by overnight express courier service, the
date of delivery shall be deemed to be the next business day after such notice
or request was deposited with such service. If sent by certified mail, the date
of delivery shall be deemed to be the fifth (5th) business day after such notice
or request was deposited with the U.S. or German Postal Service, as the case may
be.

          13.5.2 All correspondence, notices and other communications of any
kind whatsoever given between the Parties, including, without limitation, all
data, information and reports relating to the manufacture of Products, shall be
promptly provided to the other Party in English, or as an English translation
thereof, as the case may be.

     13.6 Use of Name: Except as otherwise provided herein, neither Party shall
have any right, express or implied, to use in any manner the name or other
designation of the other Party or any other trade name or trademark of the other
Party (including, without limitation, the Trademarks) for any purpose in
connection with the performance of this Agreement.

     13.7 Public Announcements: Neither Party shall make any public announcement
concerning this Agreement or the subject matter hereof without first providing
the other Party with a copy of the proposed public announcement for its review
at least three (3) days before the scheduled release date of the announcement.

     13.8 Waiver: A waiver by either Party of any of the terms and conditions of
this Agreement in any instance shall not be deemed or construed to be a waiver
of such term or condition for the future, or of any subsequent breach hereof.
All rights, remedies, undertakings, obliga-

                                      -16-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

tions and agreements contained in this Agreement shall be cumulative and none of
them shall be in limitation of any other remedy, right, undertaking, obligation
or agreement of either Party.

     13.9 Compliance with Law: Nothing in this Agreement shall be deemed to
permit a Party to export, reexport or otherwise transfer any Product sold under
this Agreement without compliance with applicable laws.

     13.10 Severability: When possible, each provision of this Agreement will be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Agreement is held to be prohibited by or invalid
under applicable law, such provision will be ineffective only to the extent of
such prohibition or invalidity, without invalidating the remainder of this
Agreement.

     13.11 Amendment: No amendment, modification or supplement of any provisions
of this Agreement shall be valid or effective unless made in writing and signed
by a duly authorized officer of each Party.

     13.12 Governing Law; [ * ] Original Controlling; Venue: This Agreement
shall be governed by and interpreted in accordance with the laws of [ * ]
without regard to conflicts of law principles. The English original of this
Agreement shall prevail over any translation hereof. The place of venue shall be
[ * ].

     13.13 Entire Agreement: This Agreement, together with the schedules and
exhibits hereto, along with the License and Development Agreement, sets forth
the entire agreement and understanding between the Parties as to the subject
matter hereof and merges all prior discussions and negotiations between them,
and neither of the Parties shall be bound by any conditions, definitions,
warranties, understandings or representations with respect to such subject
matter other than as expressly provided herein or as duly set forth on or
subsequent to the date hereof in writing and signed by a proper and duly
authorized officer or representative of the Party to be bound thereby.

     13.14 Parties in Interest: All of the terms and provisions of this
Agreement shall be binding upon, inure to the benefit of and be enforceable by
the Parties hereto and their respective permitted successors and assigns.

     13.15 Descriptive Headings: The descriptive headings of this Agreement are
for convenience only, and shall be of no force or effect in construing or
interpreting any of the provisions of this Agreement.

     13.16 Counterparts: This Agreement may be executed simultaneously in any
number of counterparts, any one of which need not contain the signature of more
than one Party but all such counterparts taken together shall constitute one and
the same agreement.

                                      -17-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

IN WITNESS WHEREOF, each of the Parties has caused this Agreement to be executed
by its duly authorized representative as of the day and year first above
written.

<TABLE>
<S>                                               <C>
DUSA PHARMACEUTICALS, INC.                        MEDAC GMBH

By:                                               By:

/s/ D. Geoffrey Shulman                           [ * ]
-------------------------------------             -------------------------------------

D. Geoffrey Shulman, MD, FRCPC                    [ * ]
President and Chief Executive Officer             -----
                                                  [ * ]
                                                  -----

                                                  By:

                                                  [ * ]
                                                  -------------------------------------

                                                  [ * ]
                                                  -----
                                                  [ * ]
                                                  -----

                                                  By:

                                                  [ * ]
                                                  -------------------------------------

                                                  [ * ]
                                                  -----
                                                  [ * ]
                                                  -----
</TABLE>

                                      -18-
<PAGE>
                                                                    EXHIBIT 10.2

                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                   EXHIBIT 1.6

                                  THE COMPOUND

<TABLE>
<S>                                 <C>
NAME AND STRUCTURE

NAME OF ACTIVE SUBSTANCE:           5-Aminolevulinic acid hydrochloride
(INN)

CHEMICAL NAME:                      5-Amino-4-oxo-pentanoic acid hydrochloride

SYNONYMS:                           5-Aminolevulinic acid hydrochloride,
                                    (delta)-Aminolevulinic acid hydrochloride

ABBREVIATIONS:                      5-ALA, (delta)-ALA, 5-ALS

EMPIRICAL FORMULA:                  C(5)H(9)NO(3) - HCl

MOLECULAR WEIGHT:                   167.59 g/mol
                                    (5-Aminolevulinic acid  hydrochloride)

STRUCTURAL FORMULA:                 (STRUCTURAL FORMULA GRAPHIC)
</TABLE>

                                      -19-
<PAGE>
                                                                    EXHIBIT 10.2

                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                  EXHIBIT 1.26

                               THE SPECIFICATIONS

                    5-AMINOLEVULINIC ACID HYDROCHLORIDE[ * ]
                                   (June 2002)

<TABLE>
<S>                                                        <C>
Description                                                [ * ]

Identity 5-aminolevulinic acid hydrochloride
- IR - spectrum                                            [ * ]
- HPLC
- Chlorid
Reconstitution time                                        [ * ]

Clarity of solution (E.P.)                                 [ * ]

Color of solution (E.P., method 1)                         [ * ]

Visible Particles                                          [ * ]

Water (KF)                                                 [ * ]

pH [ * ]                                                   [ * ]

Uniformity of mass (E.P.)                                  [ * ]

Average weight                                             [ * ]

Purity [ * ]                                               [ * ]
[ * ]                                                      [ * ]
[ * ]                                                      [ * ]
[ * ]

Residual solvents
[ * ]                                                      [ * ]

Assay
[ * ]                                                      [ * ]

Sterility                                                  [ * ]
</TABLE>

                                      -20-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

<TABLE>
  <S>                                                        <C>
  Bacterial endotoxins                                       [ * ]
</TABLE>

                                   EXHIBIT 5.3

                                 COST OF PRODUCT

A unit of Product during the Term shall mean each [ * ] of the Product
containing (i) not less than [ * ] of the Compound as the active pharmaceutical
ingredient ("API"), (ii) but not more than [ * ] of the Compound as the API. A
unit of Product on the Effective Date shall mean a [ * ] of Product containing [
* ] of API.

In the event that DUSA determines that a unit of Product needs to contain more
than [ * ] of the Compound as the API, the Parties agree, subject to the
provisions set forth in Section 5.7.2, that the Cost of Goods shall be adjusted
to include [ * ] to medac for [ * ] on a per unit basis, which adjustment shall
be fully documented and submitted to DUSA for its review and approval.

Pricing Per [ * ] Based On Annual Volumes:

<TABLE>
<CAPTION>
Number of [ * ]                  Price per Unit
---------------                  --------------
<S>                              <C>
Up to [ * ]                         $ [ * ]

From [ * ]                          $ [ * ]

From [ * ]                          $ [ * ]

From [ * ]                          $ [ * ]

All amounts above [ * ]             $ [ * ]
</TABLE>

                                      -21-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

                                   EXHIBIT 7.1

                              DRUG SAFETY AGREEMENT

                              DRUG SAFETY AGREEMENT

             STANDARD AGREEMENT ON EXCHANGE OF PHARMACOVIGILANCE AND

                             REGULATORY INFORMATION

<TABLE>
--------------------------------------------------------------------------------
<S>                                     <C>
MEDAC GMBH                              DUSA PHARMACEUTICALS, INC.

Fehlandtstrasse 3                       25 Upton Drive
D-20354 Hamburg                         Wilmington, Massachusetts 01887
Germany                                 USA
--------------------------------------------------------------------------------
</TABLE>

-    This drug safety agreement was drawn up by MEDAC GMBH (hereinafter referred
     to as the < < Licensor > >) and DUSA (hereinafter referred to as < <
     Licensee > >).

-    Photonamic and DUSA are parties to a Licensing and Development contract on
     5-ALA (5-aminolevulinic acid) hereinafter referred to as the < < Product
     > >). The Pharmacovigilance is performed by medac Gesellschaft fuer
     klinische Spezialpraeparate mbH in charge of Photonamic (see Article 12).

-    Territories: as listed in the "Licensing and Development contract":
     Photonamic Territory: Any country other than DUSA's territories. DUSA
     Territory: United States and [ * ].

The parties have mutually agreed :

ARTICLE 1 - EXPEDITED REPORTING

1.1  Each party shall report to the other party Serious Adverse Drug Reactions
     regarding the Product within a maximum of [ * ] from being received by
     either party.

1.2  The same time frames apply to the follow-up reports.

                                      -22-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

1.3  The Licensee will report to its Authorities all Serious Adverse Drug
     Reactions occurring in the DUSA Territory regarding the Product, and will
     send copies to the Licensor.

1.4  The Licensor will report to the Licensee all Serious Adverse Drug Reactions
     occurring in the Photonamic Territory and [ * ] regarding any other
     Photonamic medicines containing the same active compound as the Product
     when transmitted by Photonamic's Licensees, for purposes of information.

1.5  The Licensor will send to the Licensee copies of all reports of Serious
     Adverse Drug Reactions (expected and unexpected) occurring outside the
     European Union regarding any other Photonamic medicines containing the same
     active compound as the Product. The Licensee will report the Unexpected
     Serious Adverse Drug Reactions to its Authorities, using medac's case
     number.

1.6  Each party shall ensure parallel reporting to the Regulatory Authorities of
     all local and foreign expedited reports in their respective countries in
     which a marketing authorization or a marketing license is granted,
     according to the requirements of the applicable laws and regulations in
     such countries.

1.7  Expedited reporting between the parties shall be conducted according to the
     definitions of The Rules Governing Medicinal Products in the European Union
     Volume 9 - Pharmacovigilance; provided, however, that if a Regulatory
     Authority has a requirement which is stricter than the requirements of The
     Rules Governing Medicinal Products in the European Union Volume 9 -
     Pharmacovigilance, the parties will comply with such stricter requirement.
     The parties shall promptly inform each other in writing about such stricter
     requirements applicable in their respective territory, especially after the
     requirements have been changed.

1.8  Both parties have agreed upon the format of the suspected Adverse Drug
     Reaction report and an e-mail or fax transmission mode.

1.9  The safety reference Product Information used for determining the labeling
     of a reaction is the current version of the Summary of Product
     Characteristics approved in the respective Territory.

ARTICLE 2 - NON EXPEDITED REPORTING FOR ADVERSE DRUG REACTIONS

2.1  Individual safety reports which fulfil the criteria of Non-serious Adverse
     Drug Reactions shall be collected by each party.

2.2  Every [ * ], the individual cases shall be exchanged between both parties
     by sending each other a line-listing including all the adverse reactions
     received by each party, including the expedited cases already exchanged.
     Four quarterly reports covering the following periods: January to March,
     April to June, July to September and October to December will be addressed
     to each party.

2.3  The format and the content of this line-listing must include all the items
     which are part of The Rules Governing Medicinal Products in the European
     Union, Volume 9 - Pharmacovigilance

                                      -23-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

ARTICLE 3 - PERIODIC SAFETY UPDATE REPORTS (PSURS)

3.1  The Licensor is responsible for writing a Periodic Safety Update Report for
     Photonamic medicines containing the same active compound as the Product.
     The Licensee is responsible for submitting the PSUR to its Authorities
     after adding the recent Territory data according to the requirements of the
     applicable laws and regulations in such countries.

3.2  The current issuing schedule for the Periodic Safety Update Report is set
     at various frequencies. The PSUR will be issued at least every [ * ] upon
     renewal of the marketing authorization in the respective Territory, but
     will comply with all reporting requirements stated above.

3.3  The format and the content of the Periodic Safety Update Report must comply
     with The Rules Governing Medicinal Products in the European Union, Volume 9
     - Pharmacovigilance

3.4  The Licensee will send to the Licensor, the following information, to be
     included in the PSUR :

     -    Update on regulatory or manufacturer actions taken for safety reasons

     -    Change to Product Reference Safety Information

     -    Studies (company-sponsored studies, planned safety studies, published
          safety studies)

     -    Results from local literary reviews

     -    Periodic Safety Reports on Levulan(R) (aminolevulinic acid)

3.5  The Licensor will review the international literature when preparing the
     PSUR.

3.6  If not already identified and exchanged before, any potential labeling
     change mentioned in the PSUR should be discussed by both parties before
     issuing the PSUR.

ARTICLE 4 - INFORMATION ON ANY REGULATORY ACTION RELATING TO THE SAFETY OF THE
PRODUCT

Each party will notify the other party within [ * ] of the following actions
related to safety in one of its territories, including but not limited to :

     -    any Marketing Authorization withdrawal
     -    any Regulatory / Safety restrictions on distribution of the product
     -    any intention to distribute a "Dear Doctor Letter"
     -    any clinical trial suspension
     -    any intended labeling change for the product
     -    any request for a labeling change for the product by a regulatory
          authority
     -    any inquiry undertaken on the product by an agency

                                      -24-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

     -    any findings of adverse effects in animals, e.g. mutagenicity,
          teratogenicity, carcinogenicity which might induce a significant risk
          for human subjects.

ARTICLE 5 - INDEMNIFICATION

The parties shall make best efforts to obtain Pharmacovigilance and Regulatory
Information as described above. The Licensor shall not bear any legal
responsibility for accuracy or correctness of translation of any
Pharmacovigilance and Regulatory Information received from the Licensee or for
any delay or failure by the Licensee in reporting of Pharmacovigilance or
Regulatory Information.

ARTICLE 6 - CONFIDENTIALITY

The parties shall keep confidential any and all Pharmacovigilance and Regulatory
Information received from the other party.

Neither party shall disclose the same to any third party, except for Licensor's
Licensees and affiliates and for Regulatory Authorities in fulfilling the terms
of this agreement.

ARTICLE 7 - COST

Each party will bear any cost and expenses incurred in connection with its own
performance in fulfilling the terms of the agreement expressed herein.

ARTICLE 8 - CODIFICATION AND TRANSMISSION METHOD

A standard dictionary should be used for codification of Adverse Drug Reactions.
All Pharmacovigilance and Regulatory Information shall be in written form or in
an agreed electronic format sent to the persons named and appointed by the
Licensor and by the Licensee. The format used must be consistent with the ICH
guidelines.

ARTICLE 9 - TERM

This agreement on exchange of Pharmacovigilance and Regulatory Information on
the Product shall come into effect on the date of signature by both parties and
shall continue in full force and effect until the date of expiration or
termination of the Licensing and Development contract.

                                      -25-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

ARTICLE 10 - LITIGATION

In the event of litigation, the parties agree to refer to the jurisdiction
paragraph of the license agreement regarding the Product.

ARTICLE 11 - MISCELLANEOUS

11.1 The English language shall be used for all notices, communications and
     exchange in writing hereunder.

11.2 The parties shall meet to agree to any necessary amendments and updates, in
     particular those due to changes of laws and regulations of any territory or
     in cases of additional Licensees or new territories. The Rules Governing
     Medicinal Products in the European Union, Volume 9 - Pharmacovigilance, are
     to be strictly followed.

ARTICLE 12 - CONTACT PERSONS

<TABLE>
<S>                                         <C>
--------------------------------------------------------------------------------
MEDAC GMBH                                  DUSA PHARMACEUTICALS, INC.
Fehlandtstrasse 36
D-20354 Hamburg                             25 Upton Drive
Germany                                     Wilmington, Massachusetts 01887
                                            USA
Company performing the Pharmacovigilance
in charge of Photonamic:
medac Gesellschaft fuer klinische
Spezialpraeparate mbH
Fehlandtstrasse 3
D-20354 Hamburg
Germany
--------------------------------------------------------------------------------
</TABLE>

                                      -26-
<PAGE>
EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

<TABLE>
<S>                                                             <C>
---------------------------------------------------------------------------------------------------------
PERSONS RESPONSIBLE FOR PHARMACOVIGILANCE:                      PERSON RESPONSIBLE FOR PHARMACOVIGILANCE:
[ * ]                                                           [ * ]
[ * ]                                                           DUSA Pharmaceuticals, Inc.
medac Gesellschaft fuer klinische Spezialpraeparate mbH         25 Upton Drive
Theaterstrasse 6                                                Wilmington, Massachusetts 01887
D-22880 Wedel                                                   e-mail: [ * ]
Germany                                                         Phone:    +978-657-7500
e-mail:    drugsafety@medac.de                                  Fax:      +978-657-9193
Phone:     +49 4103 8006 443
Fax:       +49 4103 8006 466
---------------------------------------------------------------------------------------------------------
</TABLE>

                                      -27-
<PAGE>
                                                                  EXECUTION COPY

[ * ] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED.

The parties agree with this Agreement to be executed by their respective duly
authorized officers or representatives as of the day and year first written
above.

<TABLE>
<S>                                                      <C>
Place, date                                              Place, date

Signature                                                Signature

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

[ * ]

Person responsible for Pharmacovigilance                 Person responsible for Pharmacovigilance
</TABLE>

                                      -28-

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