NEUROGEN CORP
10-Q, 1999-08-16
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q

              [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                  For the quarterly period ended June 30, 1999
                                       OR
              [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                         Commission File Number 0-18311


                              NEUROGEN CORPORATION
             (Exact name of registrant as specified in its charter)


              Delaware                               22-2845714
   (State or other jurisdiction of                (I.R.S. Employer
   incorporation or organization)                 Identification No.)


                          35 Northeast Industrial Road
                           Branford, Connecticut 06405
               (Address of principal executive offices) (Zip Code)


                                 (203) 488-8201
              (Registrant's telephone number, including area code)



     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days.

                                    Yes X        No
                                       ---         ---



     As of August 16, 1999 the registrant  had 14,733,433 shares of Common Stock
outstanding.




<PAGE>




                              NEUROGEN CORPORATION

                                      INDEX


                                                                           Page
                                                                          Number

                         Part I - Financial Information


Item 1. Financial Statements...............................................  1

        Balance Sheets at June 30, 1999 and
         December 31, 1998................................................. 1,2
        Statements of Operations for the three-month and six-month
         periods ended June 30, 1999 and 1998 .............................  3
        Statements of Cash Flows for the six-month periods ended
         June 30, 1999 and 1998 ...........................................  4
        Notes to Financial Statements......................................  5

Item 2. Management's Discussion and Analysis of Financial Condition and
         Results of Operations............................................. 6-13

Item 3. Quantitative and Qualitative Disclosures About Market Risk.........  13

                           Part II - Other Information

Item 1. Legal Proceedings.................................................   14

Item 2. Changes in Securities and Use of Proceeds.........................   14

Item 3. Defaults upon Senior Securities...................................   14

Item 4. Submission of Matters to a Vote of Security Holders...............   14

Item 5. Other Information.................................................   15

Item 6. Exhibits and Reports on Form 8-K..................................   15

Signature  ................................... ...........................   17

Exhibit Index  ........................................................... 18-20




<PAGE>


                         PART I - FINANCIAL INFORMATION

ITEM 1 - FINANCIAL STATEMENTS

<TABLE>
<CAPTION>


                                                    NEUROGEN CORPORATION
                                                       BALANCE SHEETS
                                                       (In thousands)



                                                           JUNE 30, 1999                 DECEMBER 31, 1998
                          Assets                            (UNAUDITED)                       (AUDITED)
<S>                                                             <C>                             <C>
                                                           --------------                  ---------------
Current assets:
   Cash and cash equivalents                               $      47,287                   $       26,066
   Marketable securities                                          24,225                           48,944
   Receivables from corporate partners                               201                              656
   Other current assets                                              891                            1,298
                                                            -------------                  ---------------
       Total current assets                                       72,604                           76,964

Property, plant & equipment:
   Land and land improvements                                         542                              542
   Building and building improvements                              16,799                           16,704
   Leasehold improvements                                           4,026                            4,026
   Equipment                                                       10,449                            9,949
   Furniture                                                          545                              534
                                                           ---------------                 ----------------
                                                                   32,361                           31,755
   Less accumulated depreciation & amortization                     8,517                            7,265
                                                           ---------------                 ----------------
       Net property, plant and equipment                           23,844                           24,490
Other assets, net                                                     488                              356
                                                           ---------------                 ----------------
                                                           $       96,936                  $       101,810
                                                           ===============                 ================

</TABLE>





See accompanying notes to financial statements.






                                       1
<PAGE>



<TABLE>
<CAPTION>


                                                    NEUROGEN CORPORATION
                                                       BALANCE SHEETS
                                            (In thousands, except per share data)



                                                             JUNE 30, 1999              DECEMBER 31, 1998
                                                               (UNAUDITED)                   (AUDITED)
                                                           -----------------             -----------------
<S>                                                                <C>                          <C>
            Liabilities & Stockholders' Equity

Current liabilities:
   Accounts payable and accrued expenses                   $          1,917              $           2,861
   Unearned revenue from corporate partners                           3,260                            260
   Current portion of mortgage payable                                    -                             74
                                                           -----------------             ------------------
       Total current liabilities                                      5,177                          3,195
Other compensation                                                       48                             48
                                                           -----------------             ------------------
       Total liabilities                                              5,225                          3,243

Commitments and Contingencies
Stockholders' Equity:
   Preferred stock, par value $.025 per share
       Authorized 2,000 shares; none issued                              -                              -
   Common stock, par value $.025 per share
       Authorized 30,000 shares;  issued and outstanding
       14,716 shares at June 30, 1999 and 14,656 shares
       at December 31, 1998                                             368                            366
   Additional paid-in capital                                       113,767                        113,901
   Accumulated deficit                                              (19,356)                       (12,234)
   Deferred compensation                                             (2,881)                        (3,540)
   Accumulated other comprehensive income                              (187)                            74
                                                           -----------------             ------------------
       Total stockholders' equity                                    91,711                         98,567
                                                           -----------------             ------------------
                                                           $         96,936              $         101,810
                                                           =================             ==================



</TABLE>



See accompanying notes to financial statements.





                                       2
<PAGE>

<TABLE>
<CAPTION>

                                                            NEUROGEN CORPORATION
                                                          STATEMENTS OF OPERATIONS
                                                   (In thousands, except per share data)



                                                               THREE MONTHS       THREE MONTHS       SIX MONTHS      SIX MONTHS
                                                                   ENDED              ENDED            ENDED            ENDED
                                                               JUNE 30, 1999      JUNE 30, 1998     JUNE 30, 1999   JUNE 30, 1998
                                                                (UNAUDITED)        (UNAUDITED)       (UNAUDITED)     (UNAUDITED)
                                                             ----------------    ---------------   --------------   -------------
<S>                                                                 <C>                 <C>              <C>             <C>

Operating revenues:
   License fees                                              $             -       $          -      $         -      $        -
   Research and development                                            2,343              3,185            4,980           6,400
                                                             ----------------    ---------------    -------------   -------------
       Total operating revenues                                        2,343              3,185            4,980           6,400
Operating expenses:
   Research and development                                            5,914              5,196           11,764          10,200
   General and administrative                                          1,030              1,093            2,135           2,091
                                                             ----------------    ----------------   -------------   -------------
       Total operating expenses                                        6,944              6,289           13,899          12,291
                                                             ----------------    ----------------   -------------   -------------
            Operating loss                                            (4,601)            (3,104)          (8,919)         (5,891)
Other income (expense):
   Investment income                                                     887              1,102            1,800           2,193
   Interest expense                                                       (1)                (5)              (2)            (11)
                                                             ----------------    ----------------   -------------   -------------
       Total other income, net                                           886              1,097            1,798           2,182
                                                             ----------------    ----------------   -------------   -------------
Loss before provision for income taxes                                (3,715)            (2,007)          (7,121)         (3,709)
Provision for income taxes                                                -                  -                -               -
                                                             ----------------    ----------------   -------------   -------------
Net loss                                                     $        (3,715)    $       (2,007)    $     (7,121)   $     (3,709)
                                                             ================    ================   =============   =============
Net loss per share:
   Basic                                                     $         (0.26)    $        (0.14)     $     (0.49)   $      (0.26)
                                                             ================    ================   =============   =============
   Diluted                                                   $         (0.26)(1) $        (0.14) (1) $     (0.49)(1)$      (0.26)(1)
                                                             ================    ================   =============   =============
Shares used in calculation of loss per share:
   Basic                                                              14,554             14,411           14,551          14,399
                                                             ================    ================   =============   =============
   Diluted                                                            14,554 (1)         14,411  (1)      14,551 (1)      14,399 (1)
                                                             ================    ================   =============   =============

</TABLE>


See accompanying notes to financial statements.

(1) The contingently issuable common stock securities have not been included as
    they are anti-dilutive.

                                       3
<PAGE>


<TABLE>
<CAPTION>

                                                             NEUROGEN CORPORATION
                                                           STATEMENTS OF CASH FLOWS
                                                                (In thousands)


                                                                         SIX MONTHS           SIX MONTHS
                                                                            ENDED                ENDED
                                                                        JUNE 30, 1999        JUNE 30, 1998
                                                                        (UNAUDITED)           (UNAUDITED)
                                                                    ------------------      ---------------
<S>                                                                          <C>                   <C>


Cash flows from operating activities:
   Net loss                                                         $       (7,121)         $      (3,709)
   Adjustments to reconcile net loss to net cash
     used in operating activities:
       Depreciation and amortization expense                                 1,260                  1,148
       Noncash compensation expense                                            243                    239
   Changes in operating assets and liabilities:
       Decrease in accounts payable and accrued expenses                      (946)                (2,756)
       Increase in unearned revenue from corporate partners                  3,000                     60
       Decrease in other current assets                                        407                    181
       Decrease in receivable from corporate partners                          455                    870
       (Increase) decrease in other assets, net                                (140)                    59
                                                                     -----------------      ---------------
          Net cash used in operating activities                             (2,842)                (3,908)

Cash flows from investing activities:
       Purchase of plant and equipment                                        (605)                  (981)
       Purchases of marketable securities                                  (11,858)               (18,078)
       Maturities and sales of marketable securities                        36,316                 11,298
                                                                     -----------------      ---------------
          Net cash provided by (used in) investing activities               23,853                 (7,761)

Cash flows from financing activities:
       Exercise of employee stock options                                      284                    135
       Principal payments under mortgage payable                               (74)                   (99)
                                                                     -----------------      ---------------
          Net cash provided by financing activities                            210                     36
                                                                     -----------------      ---------------
          Net increase (decrease) in cash and cash equivalents              21,221                (11,633)

Cash and cash equivalents at beginning of period                            26,066                 66,924
                                                                     -----------------      ---------------
Cash and cash equivalents at end of period                           $      47,287          $      55,291
                                                                     =================      ===============

</TABLE>


See accompanying notes to financial statements.



                                       4
<PAGE>
                              Neurogen Corporation
                          Notes to Financial Statements
                                 June 30, 1999
                                   (Unaudited)

 (1)      BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

          The unaudited  financial  statements have been prepared from the books
          and records of Neurogen Corporation (the "Company") in accordance with
          generally  accepted   accounting   principles  for  interim  financial
          information  pursuant to Rule 10-01 of  Regulation  S-X.  Accordingly,
          they do not include all of the information  and footnotes  required by
          generally  accepted  accounting   principles  for  complete  financial
          statements. In the opinion of management,  all adjustments (consisting
          of  normal  recurring  accruals)   considered  necessary  for  a  fair
          presentation have been included.  These interim  financial  statements
          should be read in conjunction  with the audited  financial  statements
          for the year ended December 31, 1998 included in the Company's  Annual
          Report on Form 10-K. Interim results are not necessarily indicative of
          the results that may be expected for the fiscal year.

 (2)      EARNINGS (LOSS) PER SHARE

          Statement of Financial  Accounting  Standards  No. 128,  "Earnings per
          Share",  which became effective in 1997, requires  presentation of two
          calculations of earnings per common share. "Basic" earnings per common
          share  equals net income  divided by weighted  average  common  shares
          outstanding  during the period.  "Diluted"  earnings  per common share
          equals net income divided by the sum of weighted average common shares
          outstanding  during the period plus common stock  equivalents.  Common
          stock equivalents are shares assumed to be issued if outstanding stock
          options were exercised.






                                       5
<PAGE>
Item 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF
         FINANCIAL CONDITION AND RESULTS OF OPERATIONS

               Since its inception in September 1987,  Neurogen has been engaged
          in the discovery and development of drugs. The Company has not derived
          any revenue from product sales and expects to incur significant losses
          in most years prior to deriving any such product revenues. Revenues to
          date have come from three  collaborative  research  agreements entered
          into with Pfizer, one collaboration with Schering-Plough,  one license
          agreement with American Home Products and from interest income.

         RESULTS OF OPERATIONS

               Results of operations may vary from period to period depending on
          numerous factors, including the timing of income earned under existing
          or future strategic alliances,  technology transfer agreements,  joint
          ventures or financings, if any, the progress of the Company's research
          and  development  and  technology  transfer  projects,   technological
          advances and determinations as to the commercial potential of proposed
          products.  Neurogen expects research and development costs to increase
          significantly  over the  next  several  years as its drug  development
          programs progress.  In addition,  general and administrative  expenses
          necessary to support the expanded research and development  activities
          are expected to increase for the foreseeable future.

         THREE MONTHS ENDED JUNE 30, 1999 AND 1998

               The Company's  operating  revenues  decreased to $2.3 million for
          the three  months  ended June 30, 1999 as compared to $3.2 million for
          the same period in 1998.  This decrease in operating  revenues was due
          primarily to an  anticipated  reduction  in research  and  development
          revenues  associated  with the  conclusion  of the  research  phase of
          Neurogen's collaboration under the Schering-Plough  Agreement.

               In June 1999 Neurogen entered into the Pfizer Technology Transfer
          Agreement  (described  below).  Upon  commencement  of this agreement,
          Neurogen  received a $3.0 million  initial  license fee, which will be
          deferred and  recognized in operating  revenues over future periods as
          Neurogen  installs  its  Accelerated  Intelligent  Drug Design  (AIDD)
          system for discovering new drugs at Pfizer.

               Operating revenues in future periods may fluctuate  significantly
          depending on many factors including the following: the extent to which
          Pfizer elects to extend the Company's  ongoing research programs under
          its  existing  collaborations;  whether the Company is  successful  in
          entering  into new  collaborations;  the timing and  completion of the
          Company's   transfer  of  technology  and  systems  under  the  Pfizer
          Technology Transfer Agreement and any other similar future agreements;
          and the level of Neurogen's clinical cost reimbursements  under a cost
          sharing   arrangement   with   Pfizer  for   Neurogen's   NPY  obesity
          collaboration.



                                       6
<PAGE>

               Research  and  development  costs  increased  14  percent to $5.9
          million for the three-month  period ended June 30, 1999 as compared to
          the same period in 1998. The increase is primarily due to increases in
          research and  development  personnel as well as the Company's  further
          expansion  of  its  AIDD  Program  for  the   discovery  of  new  drug
          candidates.  Research and development  expenses represented 85 percent
          and 83 percent of total expenses in the three month periods ended June
          30, 1999 and 1998, respectively.

               General and administrative expenses were essentially unchanged at
          $1.0  million  for the  three-month  period  ended  June  30,  1999 as
          compared to the same period in 1998.

               Other income,  consisting  primarily of interest income and gains
          and losses from invested cash and marketable securities,  decreased 19
          percent for the second  quarter of 1999 as compared to the same period
          in 1998 due primarily to a lower level of invested funds.

               The Company  recognized  a net loss of $3.7 million for the three
          months ended June 30, 1999 as compared with a net loss of $2.0 million
          for the same period in 1998. The increase in the net loss is primarily
          due to an expected  decrease in research  funding,  and an increase in
          research and  development  expenses for the second quarter of 1999 due
          to the factors described above.

          SIX MONTHS ENDED JUNE 30, 1999 AND 1998

               The Company's  operating  revenues  decreased to $5.0 million for
          the six months  ended  June 30,  1999 from $6.4  million  for the same
          period in 1998.  The decrease in operating  revenues was due primarily
          to an  anticipated  reduction  in research  and  development  revenues
          associated  with the  conclusion  of the research  phase of Neurogen's
          collaboration under the Schering-Plough Agreement.  Operating revenues
          in future  periods may  fluctuate  significantly  due to many  factors
          including  those  described  above  in the  comparison  of the  second
          quarter  of  1999  to  the  second  quarter  of  1998.

               Research and development  expenses  increased 15 percent to $11.8
          million for the six months ended June 30, 1999 as compared to the same
          period  in 1998.  This  increase  is  primarily  due to  increases  in
          research and  development  personnel as well as the Company's  further
          expansion  of  its  AIDD  Program  for  the   discovery  of  new  drug
          candidates.  Research and development  expenses represented 85 percent
          of total  operating  expenses for the six-month  period ended June 30,
          1999 as compared to 83 percent for the same period in 1998.

                                        7

<PAGE>
               General and administrative expenses were essentially unchanged at
          $2.1 million for the six months ended June 30, 1999 as compared to the
          same period in 1998.

               Other income,  consisting primarily of interest income, and gains
          and losses from invested cash and marketable securities,  decreased to
          $1.8  million  for the six months  ended June 30,  1999 as compared to
          $2.2  million for the same period in 1998,  due  primarily  to a lower
          level of invested funds.

               The  Company  recognized  a net loss of $7.1  million for the six
          months ended June 30, 1999 as compared with a net loss of $3.7 million
          for the same period in 1998.  The change in earnings is primarily  due
          to a decrease  in  research  revenue,  an  increase  in  research  and
          development  expenses,   and  a  decrease  in  investment  income,  as
          explained above, for the six months ended June 30, 1999.



          LIQUIDITY AND CAPITAL RESOURCES

               At June 30, 1999 and December 31, 1998,  cash,  cash  equivalents
          and  marketable  securities  were in the  aggregate  $71.5 million and
          $75.0 million  respectively.  While the Company's  aggregate  level of
          cash, cash equivalents and marketable  securities  decreased  slightly
          during  the  first  half  of  1999,   these  levels  have   fluctuated
          significantly in the past and are expected to do so in the future as a
          result of the factors described below.

               Neurogen's  cash  requirements  to  date  have  been  met  by the
          proceeds of its financing  activities,  amounts  received  pursuant to
          collaborative or technology transfer  arrangements and interest earned
          on invested funds. The Company's  financing  activities  include three
          private  placement  offerings of its common stock prior to its initial
          public offering, underwritten public offerings of the Company's common
          stock in 1989,  1991 and 1995, and the private sale of common stock to
          Pfizer in connection  with entering into the Pfizer  Agreements and to
          American  Home  Products  in  a  licensing  agreement.  Total  funding
          received from these  financing  activities  was  approximately  $105.6
          million.  The Company's  expenditures  to date have been  primarily to
          fund research and development and general and administrative  expenses
          and to construct and equip its research and development facilities.




                                      8
<PAGE>

               In the first quarter of 1992,  the Company  entered into the 1992
          Pfizer Agreement  pursuant to which Pfizer made a $13.8 million equity
          investment in the Company and agreed,  among other  things,  to fund a
          specified  level of resources for up to five years (later  extended as
          described below) for Neurogen's research programs for the discovery of
          GABA-based drugs for the treatment of anxiety and cognitive disorders.
          As of June 30,  1999,  Pfizer had provided  $34.0  million of research
          funding to the  Company  pursuant  to the 1992  Pfizer  Agreement,  as
          extended,   and  $0.3  million  for  the  achievement  of  a  clinical
          development  milestone.  Neurogen is  eligible  to receive  additional
          milestone  payments of up to $12.2 million if certain  development and
          regulatory  objectives are achieved  regarding its products subject to
          the collaboration.  In return, Pfizer received the exclusive rights to
          manufacture  and  market   collaboration   anxiolytics  and  cognition
          enhancers that act through the family of receptors which interact with
          the  neuro-transmitter  GABA. Pfizer will pay Neurogen royalties based
          upon net sales levels, if any, for such products.

               Neurogen  and  Pfizer  entered  into their  second  collaborative
          agreement,  the 1994 Pfizer Agreement, in July 1994, pursuant to which
          Pfizer  made an  additional  $9.9  million  equity  investment  in the
          Company and agreed,  among other things,  to fund a specified level of
          resources for up to four years (later extended as described below) for
          Neurogen's  research  program for the development of GABA-based  drugs
          for the treatment of sleep disorders.  As of June 30, 1999, Pfizer had
          provided $11.0 million of research  funding to the Company pursuant to
          the 1994  Pfizer  Agreement,  as  extended,  and $0.3  million for the
          achievement of a clinical development  milestone.  Neurogen could also
          receive additional milestone payments of up to $3.0 million if certain
          development  and  regulatory  objectives  are achieved  regarding  its
          products subject to the collaboration.  In return, Pfizer received the
          exclusive  rights to manufacture and market  GABA-based sleep disorder
          products for which it will pay Neurogen royalties based upon net sales
          levels, if any.

               In December 1996 and again in December 1998,  Neurogen and Pfizer
          extended and combined  Neurogen's  research efforts under the 1992 and
          1994 Agreements.  Pursuant to the extension  agreements,  Neurogen has
          earned $3.1  million in the first six months of 1999 (which  amount is
          included in the above-described  cumulative totals earned for the 1992
          and 1994  agreements)  and under the  extension  expects to receive an
          additional  $3.1 million during the remainder of 1999 for research and
          development funding of the Company's GABA-based anxiolytic,  cognitive
          enhancer and sleep disorders projects.

               Under  both  the  1992  Pfizer  Agreement  and  the  1994  Pfizer
          Agreement,  in  addition  to making  the  equity  investments  and the
          research and milestone payments noted above, Pfizer is responsible for
          funding the cost of all clinical development and the manufacturing and
          marketing,  if  any,  of  drugs  developed  from  the  collaborations.
          Currently,  Neurogen  and  Pfizer  are  focusing  the  efforts  of the
          collaboration  on the Phase I development  of candidates  for anxiety,
          cognition  and  sleep   disorders,   the  advancement  of  preclinical
          candidates in each program and the  generation of additional  clinical
          candidates.  Neurogen  expects  the  lead  candidate  in  the  anxiety
          program,  NGD 91-3, to enter human clinical  trials in the second half
          of 1999.  The Company  believes  that it is unlikely  that Pfizer will
          conduct  additional   clinical  testing  of  a  previous  less  potent
          candidate,  NGD 91-2, which as previously announced, had not exhibited
          a significant  reduction in anxiety in a single dose model of provoked
          anxiety.



                                       9
<PAGE>
               Neurogen  and  Pfizer  entered  into  their  third  collaborative
          agreement,  the 1995 Pfizer Agreement,  in November 1995,  pursuant to
          which Pfizer made an additional $16.5 million equity investment in the
          Company bringing  Pfizer's  ownership of the Company's common stock up
          to  approximately  21 percent  and paid a $3.5  million  license  fee.
          Pfizer also agreed,  among other things,  to fund a specified level of
          resources for up to five years for Neurogen's research program for the
          discovery  of  drugs  which  work  through  the  neuropeptide  Y (NPY)
          mechanism for the treatment of obesity and other disorders. As of June
          30,  1999,  Pfizer  had  provided  $9.1  million in  research  funding
          pursuant to the 1995 Pfizer  Agreement.  In 1998, Pfizer exercised its
          option  under the 1995  Pfizer  Agreement  to extend the NPY  research
          program and also  agreed to fund  increased  Neurogen  staffing on the
          program and thereby pay Neurogen $3.1 million to fund a fourth year of
          research,  through October 1999.  Recently,  Pfizer elected to further
          extend  the  research   program  through  October  2000  and  to  fund
          Neurogen's  research  for this  fifth  year at  staffing  levels to be
          determined  by  Neurogen  and  Pfizer.  Neurogen  could  also  receive
          milestone  payments of up to  approximately  $28.0  million if certain
          development  and  regulatory  objectives  are achieved  regarding  its
          products  subject  to  the  collaboration.   As  part  of  this  third
          collaboration,  Pfizer  received  the  exclusive  worldwide  rights to
          manufacture and market NPY-based collaboration  compounds,  subject to
          certain  rights  retained  by  Neurogen.  Pursuant  to the 1995 Pfizer
          Agreement, Neurogen will fund a minority share of early stage clinical
          development  costs  and has  retained  the  right to  manufacture  any
          collaboration products in NAFTA countries.  Neurogen has also retained
          a  profit  sharing  option  with  respect  to  product  sales in NAFTA
          countries.  If Neurogen  exercises the profit sharing option,  it will
          fund a portion of the cost of late stage clinical trials and marketing
          costs  and in return  receive a  specified  percentage  of any  profit
          generated by sales of collaboration  products in NAFTA  countries.  If
          Neurogen  chooses not to exercise its  profit-sharing  option,  Pfizer
          would pay Neurogen  royalties on drugs marketed in NAFTA countries and
          will fund a majority of early stage and all late stage development and
          marketing  expenses.  In either  case  Neurogen  would be  entitled to
          royalties on drugs marketed in non-NAFTA countries.

               In the second quarter of 1999, Neurogen and Pfizer entered into a
          technology  transfer  agreement,   (the  "Pfizer  Technology  Transfer
          Agreement").  Under the terms of this agreement,  Pfizer has agreed to
          pay Neurogen a total of $27.0 million over a three year period for the
          licensing  and  transfer  to  Pfizer of  certain  of  Neurogen's  AIDD
          technologies   for  the  discovery  of  new  drugs,   along  with  the
          installation of an AIDD system.  Additional payments are also possible
          upon Pfizer's  successful  utilization of this technology.  Pfizer has
          received  a  non-exclusive   license  to  certain  AIDD   intellectual
          property,  and the right to  employ  this  technology  in its own drug
          development  programs.  As of June 30, 1999,  Pfizer had provided $3.0
          million  in  license  fees  pursuant  to the  Pfizer  AIDD  agreement.
          Revenues  associated with amounts received under the Pfizer Technology
          Transfer  Agreement  will be  recognized  in  future  periods  and may
          fluctuate  significantly depending on the timing and completion of the
          Company's   transfer  of  technology  and  systems   pursuant  to  the
          agreement.

               In June  1995,  Neurogen  and  Schering-Plough  entered  into the
          Schering-Plough   Agreement  to   collaborate  in  the  discovery  and
          development  of drugs for the  treatment  of  schizophrenia  and other
          disorders which act through the dopamine family of receptors. Pursuant
          to  the  Schering-Plough  Agreement,  the  Company  received  one-time
          license  fees of $14.0  million  for  rights  relating  to  Neurogen's
          dopamine  program  and $3.0  million  in each of 1995 and 1996 for the
          right to test certain of Neurogen's  combinatorial chemistry libraries
          in  selected  non-CNS  assays.  Neurogen  received  scheduled  funding
          aggregating  approximately  $10.8 million during the three-year period
          from June 1995 through June 1998, for research and development funding
          of the Company's dopamine program.


                                       10
<PAGE>
               In  July  1998,   Neurogen   announced   that  the   Company  and
          Schering-Plough had concluded the research phase of the collaboration.
          Accordingly,  the funding of $3.6 million per year  formerly  received
          from Schering-Plough came to its scheduled conclusion on July 1, 1998.
          Should  Schering-Plough  elect to  continue  the  development  of drug
          candidates subject to the  collaboration,  Neurogen could also receive
          milestone  payments of up to  approximately  $32.0  million if certain
          development  and  regulatory   objectives  are  achieved.  In  return,
          Schering-Plough  received the  exclusive  worldwide  license to market
          dopamine-based   products  subject  to  the  collaboration.   Neurogen
          retained the rights to receive royalties based on net sales levels, if
          any,  and an option to  manufacture  products  for the  United  States
          market. In addition to the payments  described above,  Schering-Plough
          is responsible  for funding the cost of all clinical  development  and
          marketing, if any, of drugs subject to the collaboration.

               The  Company  plans  to  use  its  cash,  cash   equivalents  and
          marketable  securities  for its research and  development  activities,
          working capital and general corporate purposes.  Neurogen  anticipates
          that its current cash balance,  as  supplemented  by research  funding
          pursuant to the Pfizer Agreements and fees it expects to receive under
          the Pfizer Technology Transfer  Agreement,  will be sufficient to fund
          its current and planned operations through 2002.  However,  Neurogen's
          funding requirements may change and will depend upon numerous factors,
          including but not limited to, the progress of the  Company's  research
          and  development  programs,  the  timing and  results  of  preclinical
          testing and  clinical  studies,  the timing of  regulatory  approvals,
          technological advances,  determinations as to the commercial potential
          of its proposed products,  the status of competitive  products and the
          ability  of  the  Company  to  establish  and  maintain  collaborative
          arrangements  with others for the purpose of funding certain  research
          and  development  programs,  the ability of the  Company to  establish
          additional   technology  transfer   agreements,   conducting  clinical
          studies,  obtaining  regulatory  approvals  and, if such approvals are
          obtained,   manufacturing   and   marketing   products.   The  Company
          anticipates  that it may augment its cash  balance  through  financing
          transactions,  including the issuance of debt or equity securities and
          further  corporate  alliances.  No arrangements have been entered into
          for any future  financing and no assurances can be given that adequate
          levels of additional funding can be obtained on favorable terms, if at
          all.



                                       11
<PAGE>
               As of December  31,  1998,  the Company had  approximately  $24.3
          million of net  operating  loss  carryforwards  available  for federal
          income tax purposes which expire from the years 2004 through 2013. The
          Company had  approximately  $19.8 million of Connecticut state tax net
          operating loss  carryforwards  as of December 31, 1998 which expire in
          the  years  1999  through  2003.  Because  of  "change  in  ownership"
          provisions of the Tax Reform Act of 1986, the Company's utilization of
          its  net   operating   loss  and  research  and   development   credit
          carryforwards  may  be  subject  to an  annual  limitation  in  future
          periods.

Discussion of the Year 2000 issue

               General.  The Year 2000 issue is the result of computer  programs
          being  written  using  two  digits  rather  than  four to  define  the
          applicable  year.  Any of the  Company's  computer  programs that have
          date-sensitive  software  may  recognize a date using "00" as the year
          1900 rather than the year 2000.  This could result in a system failure
          or miscalculations  causing disruption of operations including,  among
          other things, a temporary inability to access scientific data, process
          transactions, or engage in similar normal business activities.

               Program. The Company has begun a program to resolve the Year 2000
          issue. This program consists of four phases: assessment,  remediation,
          testing and contingency planning. The Company completed the assessment
          phase in December  1998 and is  currently  in the  remediation  phase.
          During the assessment  phase, the Company  assessed its products,  key
          financial  and  operating  systems  and  other  systems  for Year 2000
          compliance.   The  assessment   included   identifying   all  critical
          information technology systems and non-information technology critical
          systems on which the Company  relies,  testing Year 2000 compliance of
          such  systems,   and  recommending   steps  for  replacing  or  making
          corrective fixes to non-compliant systems.  Additionally,  the Company
          obtained   compliance   verification  from  key  third  party  vendors
          supplying  critical  parts  or  services  to the  Company  in order to
          determine their plans to address their own Year 2000 issues.

               Upon completion of the detailed assessment, the Company concluded
          that  substantially all its key financial  operating systems and other
          systems  are  Year  2000  compliant.  However,  certain  software  and
          hardware components were identified as non-compliant.  The Company has
          established a plan to replace this non-compliant software and hardware
          by October 1999. Also, the Company believes that its processes will be
          unaffected by the Year 2000 issue.

               The  testing  phase of the program  has been  on-going,  and will
          continue to be  conducted as  non-compliant  software and hardware are
          replaced.   The  Company   estimates   that  the   testing   phase  is
          approximately 80% completed as of June 30, 1999. The Company currently
          plans to develop a  contingency  plan during the third quarter of 1999
          for any systems not expected to be Year 2000 compliant by December 31,
          1999.


                                       12

<PAGE>
               Costs.  The Company  plans  completion  of all phases,  including
          contingency planning, of the Year 2000 program by the end of the third
          quarter of 1999.  All costs  associated  with the Company's  Year 2000
          program are being  expensed as incurred.  The estimated  total cost of
          the Year 2000  program  is  approximately  $200,000,  which  primarily
          includes the cost of employee time spent on the issue, and the cost of
          replacing or upgrading  non-compliant  software  identified during the
          assessment  phase.  Costs incurred through June 30, 1999 have totalled
          approximately $170,000.

               Risks. The Company presently  believes that with modifications to
          existing software and conversions to new software, the Year 2000 issue
          can be  mitigated.  However,  the Company may not timely  identify and
          remediate all significant  Year 2000 problems and remedial efforts may
          involve  greater time and expense than is  currently  anticipated.  If
          such  modifications and conversions fail to be made, or are not timely
          completed,  the Year 2000 issue  could  have a material  impact on the
          results  of  operations,  financial  position  or  cash  flows  of the
          Company.  Furthermore,  there can be no  assurance  that any Year 2000
          compliance  problems of the Company or its customers or suppliers will
          not have a  material  adverse  effect on the  results  of  operations,
          financial position or cash flows of the Company.

               The Company  believes that the most reasonably  likely worst case
          scenario is that a temporary  disruption of operations would occur due
          to  any  or all of the  following:  unavailability  of  services  from
          utility companies,  delay in receipt of supplies from vendors,  having
          to access  archived  back-ups of databases of stored  information,  or
          delays  in  accessing  the  Company's  financial  resources  caused by
          problems in the banking industry.

               The  estimates and  conclusions  herein  contain  forward-looking
          statements  and are based on  management's  best  estimates  of future
          events.  Risks to completing the program  include the  availability of
          resources,  the  Company's  ability to discover  and correct Year 2000
          problems  which could have an impact on the Company's  operations  and
          the  ability  of  suppliers  to bring  their  systems  into  Year 2000
          compliance.

               The  information  contained  in this Year 2000  update is, to the
          extent applicable,  a "Year 2000 Readiness  Disclosure" under the Year
          2000 Information and Readiness Act of 1998.

Item 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

               Interest rate risk. The Company's  investment  portfolio includes
          investment  grade debt  instruments.  These  securities are subject to
          interest  rate  risk,  and could  decline in value if  interest  rates
          fluctuate.  Due to the short duration and conservative nature of these
          instruments,  the  Company  does not  believe  that it has a  material
          exposure to interest rate risk.  Additionally,  funds  available  from
          investment  activities are dependent upon available  investment rates.
          These  funds may be higher or lower than  anticipated  due to interest
          rate volatility.

               Capital  Market  Risk.  The  Company  currently  has  no  product
          revenues and is dependent on funds raised through other  sources.  One
          source of funding is through further equity offerings.  The ability of
          the Company to raise funds in this manner is  dependent  upon  capital
          market forces affecting the stock price of the Company.

                                      13
<PAGE>
                           Part II - Other Information

Item 1. Legal Proceedings

              Not applicable for the second quarter ended June 30, 1999.

Item 2. Changes in Securities

              Not applicable for the second quarter ended June 30, 1999.

Item 3. Defaults upon Senior Securities

              Not applicable for the second quarter ended June 30, 1999.

Item 4. Submission of Matters to a Vote of Security Holders

               On  May  26,  1999,  the  Company  held  its  annual  meeting  of
          stockholders  (i) to elect a board of eleven  directors  (Proposal 1);
          and (ii) to  ratify  the  appointment  by the  Board of  Directors  of
          PricewaterhouseCoopers LLP as the independent auditors for the Company
          for the fiscal year ending December 31, 1999 (Proposal 2).

     Proposal 1

               The  stockholders  elected the persons named below, the Company's
          nominees for directors, as directors of the Company,  casting votes in
          favor of such nominees or withholding votes as indicated:
<TABLE>
<CAPTION>
<S>                            <C>                      <C>
                              Votes in Favor           Votes Withheld
                              --------------           --------------

Barry M. Bloom, Ph.D.           9,594,439                 136,372
Robert N. Butler                9,594,439                 136,372
Frank C. Carlucci               9,594,439                 136,372
Jeffrey J. Collinson            9,594,439                 136,372
Robert M. Gardiner              9,594,439                 136,372
Mark Novitch, M.D.              9,594,439                 136,372
Harry H. Penner, Jr.            9,594,439                 136,372
Robert H. Roth, Ph.D.           9,594,439                 136,372
John Simon                      9,594,439                 136,372
John F. Tallman, Ph.D.          9,594,439                 136,372
Suzanne H. Woolsey, Ph.D.       9,594,439                 136,372

 </TABLE>
               All of the Directors  elected are continuing their term of office
          as Directors after the annual meeting.

             The Stockholders approved Proposal 2, voting as follows:
<TABLE>
<CAPTION>
<S>                  <C>                     <C>                 <C>
                    Affirmative Votes       Negative Votes       Votes Abstained
                    -----------------       --------------       ---------------
Proposal 2              9,606,873              120,758                3,280

</TABLE>
                                     14
<PAGE>

Item 5. Other information

               On May 26, 1999,  following the annual  meeting of  stockholders,
          the newly elected Board of Directors convened in their first regularly
          scheduled meeting. At that time, the Board voted unanimously to expand
          from 11 to 13 members,  and to appoint  Julian  Baker and Felix Baker,
          representatives  of the Tisch Family  Interests,  to the newly created
          director seats.

Item 6. Exhibits and Reports on Form 8-K

           (a) See Exhibit Index on page 11.

           (b) None

                                     15
<PAGE>



SAFE HARBOR STATEMENT

Statements  which  are not  historical  facts,  including  statements  about the
Company's  confidence and strategies,  the status of various product development
programs,  the sufficiency of cash to fund planned  operations and the Company's
expectations  concerning its development compounds,  drug discovery technologies
and  opportunities  in  the  pharmaceutical  marketplace  are  "forward  looking
statements" within the meaning of the Private Securities  Litigations Reform Act
of 1995 that involve risks and  uncertainties  and are not  guarantees of future
performance. These risks include, but are not limited to, difficulties or delays
in development, testing, regulatory approval, production and marketing of any of
the  Company's  drug  candidates,  the  failure to attract or retain  scientific
management  personnel,   any  unexpected  adverse  side  effects  or  inadequate
therapeutic  efficacy  of the  Company's  drug  candidates  which  could slow or
prevent  product   development   efforts,   competition   within  the  Company's
anticipated product markets, the Company's dependence on corporate partners with
respect  to  research   and   development   funding,   regulatory   filings  and
manufacturing and marketing expertise, the uncertainty of product development in
the pharmaceutical industry, inability to obtain sufficient funds through future
collaborative  arrangements,  equity  or debt  financings  or other  sources  to
continue  the  operation  of the  Company's  business,  risk  that  patents  and
confidentiality   agreements   will  not   adequately   protect  the   Company's
intellectual  property or trade secrets,  dependence  upon third parties for the
manufacture of potential  products,  inexperience in  manufacturing  and lack of
internal  manufacturing  capabilities,  dependence  on third  parties  to market
potential  products,  lack  of  sales  and  marketing  capabilities,   potential
unavailability   or  inadequacy  of  medical   insurance  or  other  third-party
reimbursement  for the cost of purchases of the  Company's  products,  and other
risks  detailed in the Company's  Securities  and Exchange  Commission  filings,
including its Annual  Report on Form 10-K for the year ended  December 31, 1998,
each of which could adversely affect the Company's  business and the accuracy of
the forward-looking statements contained herein.


















                                       16
<PAGE>




                                    Signature



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


                                                            NEUROGEN CORPORATION



                                               By:/s/   STEPHEN R. DAVIS
                                                  ------------------------
                                                    Stephen R. Davis
                                                    Vice President-Finance,
                                                    Chief Financial Officer
                                                    and General Counsel

Date:  August 16, 1999

























                                       17
<PAGE>
                                  Exhibit Index
Exhibit
- -------
Number
- ------

10.1    - Neurogen  Corporation Stock  Option Plan, as amended  (incorporated by
          reference  to Exhibit 10.1 to the  Company's  Form 10-K for the fiscal
          year ended December 31, 1991).

10.2    - Form of Stock Option  Agreement  currently used in connection with the
          grant  of  options  under  Neurogen   Corporation  Stock  Option  Plan
          (incorporated  by reference to Exhibit 10.2 to the Company's Form 10-K
          for the fiscal year ended December 31, 1992).

10.3    - Neurogen   Corporation   1993  Omnibus   Incentive  Plan,  as  amended
          (incorporated  by reference to Exhibit 10.3 to the Company's Form 10-K
          for the fiscal year ended December 31, 1993).

10.4    - Form of Stock Option  Agreement  currently used in connection with the
          grant of options under  Neurogen  Corporation  1993 Omnibus  Incentive
          Plan (incorporated  by reference to Exhibit 10.4 to the Company's Form
          10-K for the fiscal year ended December 31, 1993).

10.5    - Neurogen   Corporation   1993  Non-Employee   Directors  Stock  Option
          Program  (incorporated  by reference to Exhibit 10.5 to the  Company's
          Form 10-K for the fiscal year ended December 31, 1993).

10.6    - Form of Stock Option  Agreement  currently used in connection with the
          grant  of  options  under  Neurogen   Corporation  1993   Non-Employee
          Directors Stock Option Program  (incorporated  by reference to Exhibit
          10.6 to the Company's Form 10-K for the fiscal year ended December 31,
          1993).

10.7    - Employment  Contract  between the Company  and Harry H.  Penner,  Jr.,
          dated as of October 12, 1993  (incorporated  by  reference  to Exhibit
          10.7 to the Company's Form 10-K for the fiscal year ended December 31,
          1993).

10.8    - Employment Contract between the Company and John F. Tallman,  dated as
          of December 1, 1993 (incorporated by reference to Exhibit 10.25 to the
          Company's Form 10-Q for the quarterly period ended September 30,1994).

10.9    - Open-End Mortgage Deed and Security  Agreement between the Company and
          Orion   Machinery   &   Engineering   Corp.,   dated  March  16,  1989
          (incorporated  by reference to Exhibit 10.15 to Registration Statement
          No. 33-29709 on Form S-1).

10.10   - Form   of   Proprietary   Information    and    Inventions   Agreement
          (incorporated by reference to Exhibit 10.31 to Registration  Statement
          No. 33-29709 on Form S-1).

10.11   - Warrant  to  Purchase  47,058  Shares  of  Common  Stock  to  MMC/GATX
          Partnership No. I, dated February 20, 1991  (incorporated by reference
          to Exhibit 10.34 to the Company's  Form 10-K for the fiscal year ended
          December 31, 1990).

                                       18
<PAGE>



10.12   - Collaborative  Research  Agreement  and License and Royalty  Agreement
          between  the  Company  and  Pfizer  Inc,  dated as of  January 1, 1992
          (CONFIDENTIAL  TREATMENT  REQUESTED)  (incorporated  by  reference  to
          Exhibit  10.35 to the  Company's  Form 10-K for the fiscal  year ended
          December 31, 1991).

10.13   - License  Agreement  between  the  Company and the  National  Technical
          Information  Service,  dated as of  January 1, 1992  (incorporated  by
          reference to Exhibit 10.36 to the  Company's  Form 10-K for the fiscal
          year ended December 31, 1991).

10.14   - Cooperative Research and Development Agreement between the Company and
          the  National  Institutes  of  Health,  dated as of January  21,  1993
          (incorporated by reference to Exhibit 10.37 to the Company's Form 10-K
          for the fiscal year ended December 31, 1991).

10.15   - Letter Agreement between the Company and Barry M. Bloom, dated January
          12, 1994  (incorporated by reference to Exhibit 10.25 to the Company's
          Form 10-K for the fiscal year ended December 31, 1993).

10.16   - Letter  Agreement  between the Company and Robert H. Roth, dated April
          14, 1994  (incorporated by reference to Exhibit 10.26 to the Company's
          Form 10-K for the fiscal year ended December 31, 1994).

10.17   - Collaborative  Research  Agreement  and License and Royalty  Agreement
          between  the  Company  and  Pfizer  Inc,  dated  as of  July  1,  1994
          (CONFIDENTIAL  TREATMENT  REQUESTED)  (incorporated  by  reference  of
          Exhibit 10.1 to the Company's Form 10-Q for the quarterly period ended
          June 30, 1994).

10.18   - Stock  Purchase  Agreement  between the Company and Pfizer dated as of
          July  1,  1994  (incorporated  by  reference  to  Exhibit  10.2 to the
          Company's Form 10-Q for the quarterly period ended June 30, 1994).

10.19   - Registration Rights and Standstill Agreement among the Company and the
          Persons and  Entities  listed on Schedule I thereto,  dated as of July
          11, 1994 (incorporated  by reference to Exhibit 10.29 to the Company's
          Form 10-Q for the quarterly period ended September 30, 1994).

10.20   - Collaboration  and License  Agreement and Screening  Agreement between
          the Company and Schering-Plough  Corporation  (CONFIDENTIAL  TREATMENT
          REQUESTED) (incorporated by reference to Exhibit 10.1 to the Company's
          Form 8-K dated July 28, 1995).

10.21   - Lease Agreement between the Company and Commercial Building Associates
          dated as of August 30,  1995  (incorporated  by  reference  to Exhibit
          10.27  to  the  Company's Form  10-Q  for  the  quarterly period ended
          September 30, 1995).

10.22   - Collaborative  Research Agreement between the Company and Pfizer dated
          as  of    November   1,   1995    (CONFIDENTIAL  TREATMENT  REQUESTED)
          (incorporated by reference to Exhibit 10.1 of the  Company's Form 8-K
          dated November 1, 1995).

                                       19
<PAGE>

10.23   - Development and  Commercialization  Agreement  between the Company and
          Pfizer dated as of November 1, 1995 (CONFIDENTIAL TREATMENT REQUESTED)
          (incorporated  by  reference to Exhibit 10.2 of the Company's Form 8-K
          dated November 1, 1995).

10.24   - Stock  Purchase  Agreement  between the Company and Pfizer dated as of
          November  1, 1995  (incorporated  by   reference  to  Exhibit  10.3 of
          the Company's Form 8-K dated November 1, 1995).

10.25   - Licensing  Agreement dated  as of  November 25, 1996 between  American
          Home   Products   Corporation,   acting   through   its   Wyeth-Ayerst
          Laboratories   Division,   and  Neurogen   Corporation   (CONFIDENTIAL
          TREATMENT REQUESTED) (incorporated by reference to Exhibit 10.1 of the
          Company's Form 8-K dated March 31, 1997).

10.26   - Stock  Purchase  Agreement  dated  as of  November  25,  1996  between
          American Home Products  Corporation,  acting through its  Wyeth-Ayerst
          Laboratories   Division,   and  Neurogen   Corporation   (CONFIDENTIAL
          TREATMENT REQUESTED) (incorporated by reference to Exhibit 10.1 of the
          Company's Form 8-K dated March 31, 1997).

10.27   - Technology agreement dated as of June 15, 1999 between the Company and
          Pfizer Inc (CONFIDENTIAL TREATMENT REQUESTED).

27.1    - Financial Data Schedule


























                                       20






<TABLE> <S> <C>


<ARTICLE>                     5
<CIK>   0000849043
<NAME>  NEUROGEN CORPORATION
<MULTIPLIER>                                   1,000


<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1999
<PERIOD-START>                                 JAN-01-1999
<PERIOD-END>                                   JUN-30-1999
<CASH>                                         47,287
<SECURITIES>                                   24,225
<RECEIVABLES>                                  0
<ALLOWANCES>                                   0
<INVENTORY>                                    0
<CURRENT-ASSETS>                               72,604
<PP&E>                                         32,361
<DEPRECIATION>                                 8,517
<TOTAL-ASSETS>                                 96,936
<CURRENT-LIABILITIES>                          5,177
<BONDS>                                        0
                          0
                                    0
<COMMON>                                       368
<OTHER-SE>                                     (187)
<TOTAL-LIABILITY-AND-EQUITY>                   96,936
<SALES>                                        0
<TOTAL-REVENUES>                               4,980
<CGS>                                          0
<TOTAL-COSTS>                                  13,899
<OTHER-EXPENSES>                               (1,798)
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                             2
<INCOME-PRETAX>                                (7,121)
<INCOME-TAX>                                   0
<INCOME-CONTINUING>                            (7,121)
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   (7,121)
<EPS-BASIC>                                  (0.49)
<EPS-DILUTED>                                  (0.49)



</TABLE>



                        TECHNOLOGY ACQUISITION AGREEMENT

This TECHNOLOGY ACQUISITION AGREEMENT is entered into as of June 15, 1999 by and
between  PFIZER INC, a Delaware  corporation,  having an office at 235 East 42nd
Street,  New York,  New York 10017 and its Affiliates  ("Pfizer"),  and NEUROGEN
CORPORATION, a Delaware corporation, having an office at 35 Northeast Industrial
Road, Branford, Connecticut 06405 and its Affiliates ("Neurogen").

WHEREAS,  Neurogen has developed a technology  known as Accelerated  Intelligent
Drug Design ("AIDD") which integrates biological assays,  chemical synthesis and
computational analysis and is generally useful in pharmaceutical drug discovery;

WHEREAS,  Pfizer  seeks to  collaborate  with  Neurogen on the  transfer of AIDD
technology to Pfizer and further development of AIDD technology;

WHEREAS,  Pfizer  seeks to obtain a  nonexclusive  license to trade  secrets and
copyrights to AIDD technology,  including the technology described in Exhibit A,
which is attached to and made a part of this Agreement; and

WHEREAS,  Neurogen  is  willing to enter into a  technology  collaboration  with
Pfizer to transfer AIDD technology, to grant such license and to further develop
AIDD technology.

NOW, THEREFORE, the parties agree as follows:

1.    Definitions

Whenever used in this Agreement,  the terms defined in this Section 1 shall have
the meanings specified.

     1.1 "Acceptance Testing"

                         [CONFIDENTIAL MATERIAL OMITTED
                          AND FILED SEPARATELY WITH THE
                       SECURITIES AND EXCHANGE COMMISSION]

     1.2 "Affiliate"  means any corporation or other legal entity  "controlled,"
"controlling,"  or "under common  control  with,"  another  corporation or legal
entity,  where  "control"  means  ownership,  directly or  indirectly,  of fifty
percent (50%) or more of the voting capital shares or similar voting  securities
of the other entity.

     1.3 "AIDD Software" means existing computer programs  developed by Neurogen
for use in System, and Improvements to it.

     1.4  "AIDD  Unit"  means  an  assembled  unit  of  Components  in a  single
operational System unit as further described,  attached to and made part of this
Agreement as Exhibit C.

     1.5 "CAN" means the  Pfizer-documented  event within a Program in which, in
Pfizer's sole unfettered discretion, a Compound is recognized as a candidate for
drug development.

     1.6  "Collaboration  Plan"  means the written  plan  adopted by the parties
prior to the execution of this  Agreement and amended from time to time, by both
parties,  to  describe  activities  to be carried  out by them  pursuant to this
Agreement.  The initial  Collaboration Plan is attached to and made part of this
Agreement as Exhibit D.

     1.7  "Collaboration  Program" means the technology  transfer and technology
development program contemplated in this Agreement to be conducted by Pfizer and
Neurogen pursuant to the Collaboration Plan.

     1.8 "Components" mean the equipment  described in Exhibit C forming an AIDD
Unit.
                         [CONFIDENTIAL MATERIAL OMITTED
                          AND FILED SEPARATELY WITH THE
                       SECURITIES AND EXCHANGE COMMISSION]

     1.9  "Compound"  means  an  active  compound  whose  chemical  lineage  and
structure;  (a) can,  by using the  Tracking  System,  be  traced to a  specific
Program;  and (b) falls within a claim in a pending patent application or issued
patent owned by or licensed to Pfizer.

     1.10 "Contract Period" means the period beginning on the Effective Date and
ending on the date on which this Agreement terminates.

     1.11 "Effective Date" means June 15, 1999.

     1.12  "Islands"  means the set of algorithms  developed by Neurogen  which;

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     1.13 "Neurogen  Confidential  Information"  means all information about any
element of the Neurogen  Technology which is disclosed by Neurogen to Pfizer and
designated  "Confidential"  in writing by Neurogen at the time of  disclosure to
Pfizer or within thirty (30) days  following  disclosure to the extent that such
information  is not (i) known to Pfizer as of the date of  disclosure  to Pfizer
other than by virtue of a prior  confidential  disclosure to Pfizer by Neurogen;
or (ii) disclosed in published  literature,  or otherwise generally known to the
public  through no fault or omission of Pfizer;  or (iii)  obtained from a third
party free from any obligation of confidentiality to Neurogen.

     1.14  "Neurogen  Technology"

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     1.15 "Improvements"

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     1.16  "Patent  Rights and  Copyrights"  shall  mean all  patent  rights and
copyrights  in  and  to  inventions   and   individual   works  of   authorship,
respectively,  within Neurogen Technology or Pfizer Technology  including issued
patents and pending patent applications  whether domestic or foreign,  including
all substitutions, continuations, continuations-in-part, divisions and renewals,
and letters  patent  granted  thereon,  and all  reissues,  re-examinations  and
extensions thereof.

     1.17 "Pfizer  Confidential  Information"

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     1.18 "Pfizer Technology" means Pfizer technology developed by or for Pfizer
alone or jointly with third parties (other than Neurogen) prior to the Effective
Date or during the  Contract  Period,  including  but not limited to  biological
data, computational chemistry software, ADME-toxicity technology, analytical and
synthetic chemistry protocols,  chemical fragments, and HTS and uHTS methods for
chemistry and screening.

     1.19  "Program"
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     1.20 "Project II"
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     1.21 "Sites"
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     1.22 "System"
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     1.23 "Tracking  System"

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 2.       Collaboration Program

     2.1 Purpose.  Neurogen and Pfizer shall conduct the  Collaboration  Program
throughout the Contract Period. The objectives of the Collaboration  Program are

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     2.2  Collaboration  Plan. The initial  Collaboration  Plan is described in,
attached to and made part of this Agreement as Exhibit D. The Steering Committee
shall prepare an amended  Collaboration  Plan no later than at least ninety (90)
days  prior  to  each   anniversary  of  the  Effective   Date,   which  amended
Collaboration Plan will apply to the next year. Each amended  Collaboration Plan
shall be appended to Exhibit D and made part of this Agreement.

     2.3 Steering Committee

          2.3.1  Purpose.   Pfizer  and  Neurogen  shall  establish  a  Steering
     Committee (the "Steering Committee"):
               (a) to review and evaluate progress under the Collaboration Plan;
               (b) to prepare the Collaboration Plan and any amendments;
               (c) to prepare and evaluate progress on Project II plans;
               (d) to coordinate visits and training; and
               (e) to  coordinate  and   monitor  exchange  of  information  and
                   materials  that relate to the  Collaboration  Program.  (This
                   function  shall survive the termination of this Agreement).

          2.3.2 Membership. Pfizer and Neurogen each shall appoint, in it's sole
     unfettered  discretion,   four  (4)  members  to  the  Steering  Committee.
     Substitutes may be appointed at any time by a party by notice in writing to
     the other party; provided, however,

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          The members initially shall be:
          Pfizer Appointees:

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          Neurogen Appointees:

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          2.3.3  Chair.   The  Steering   Committee  shall  be  chaired  by  two
     co-chairpersons, one appointed by each of the parties.

          2.3.4  Meetings.  The Steering  Committee shall meet at least four (4)
     times per year, at places and on dates  selected by each party in turn. One
     (1) of the four (4) meetings may be by videoconference.  Representatives of
     Pfizer  or  Neurogen  or both,  in  addition  to  members  of the  Steering
     Committee, may attend such meetings at the invitation of either party.

          2.3.5 Minutes.  The Steering  Committee shall keep accurate minutes of
     its  deliberations,  which  record all proposed  decisions  and all actions
     recommended  or taken.  Drafts of the  minutes  shall be  delivered  to all
     Steering  Committee  members  within  ten (10)  business  days  after  each
     meeting.  The  party  hosting  the  meeting  shall be  responsible  for the
     preparation  and  circulation of the draft minutes.  Draft minutes shall be
     edited by the  co-chairpersons  and shall be issued in final form only with
     their approval and agreement.

          2.3.6 Decisions.

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          2.3.7  Expenses.  Pfizer and Neurogen  shall each bear all expenses of
     their  respective  members related to their  participation  on the Steering
     Committee.

          2.4 Reports and Materials.

               2.4.1 Reports. During the Contract Period, Neurogen shall furnish
          to the Steering Committee:

                    (a) summary  written  reports  describing its progress under
               the Collaboration Plan and delivered electronically within thirty
               (30) days after the end of each three (3) month  period and seven
               (7) days prior to the Steering Committee  meeting,  commencing on
               the Effective Date; and

                    (b)  comprehensive  written  reports within thirty (30) days
               after the end of each  contract  year,  describing  in detail the
               work accomplished by it under the Collaboration  Plans during the
               year and discussing and evaluating the results of such work.

               2.4.2  Materials.  During the Contract Period Neurogen and Pfizer
          shall as a matter of course, as described in the  Collaboration  Plan,
          or upon each other's  written or oral  request,  furnish to each other
          samples of biochemical or synthetic chemical materials,  which are (a)
          part of Pfizer  Technology or Neurogen  Technology;  and (b) necessary
          for  each   party  to  carry  out  its   responsibilities   under  the
          Collaboration  Plan.  To the extent that the  quantities  of materials
          requested  by either  party  exceed  the  quantities  set forth in the
          Collaboration  Plan,  the requesting  party shall  reimburse the other
          party  for  the  reasonable  costs  of  such  materials  if  they  are
          furnished.

          2.5 Notebooks and Personnel. Neurogen shall provide suitable personnel
     for the  work to be done by  Neurogen  in  carrying  out the  Collaboration
     Program.  All work performed by Neurogen staff under the Collaboration Plan
     with respect to Project II  Improvements  and  Acceptance  Testing shall be
     recorded in laboratory, notebooks, which Pfizer may review, extract or copy
     at any time, upon reasonable notice.

          2.6 Neurogen's Activities:  During the Contract Period, Neurogen shall
     perform the following technology transfer and development  activities under
     the Collaboration Program.

               2.6.1 Neurogen shall transfer

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               The Steering  Committee  will organize and monitor these transfer
          activities which shall include without limitation:

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          If Pfizer requests additional training visits by Neurogen staff to any
          Site, and such visits do not coincide with Steering Committee meetings
          at such Site, then Pfizer shall reimburse  Neurogen for its reasonable
          staff travel expenses for such visit.

               2.6.2  Neurogen  shall   construct  the  Systems  and  Components

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          shall perform Acceptance Testing on each AIDD Unit; and shall deliver

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          as  set  forth  in  the  production  and  delivery   schedule  in  the
          Collaboration Plan;  provided,  however,  that Neurogen shall have the
          right, upon thirty (30) days written notice to Pfizer, to deliver

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          to Pfizer prior to their respective scheduled delivery dates. Neurogen
          and Pfizer will perform Acceptance Testing on its premises

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          The location of Acceptance Testing shall be determined by the Steering
          Committee at the time of delivery

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          Prior to and during Acceptance Testing,  Pfizer information technology
          ("IT") staff may, upon reasonable  notice and during ordinary business
          hours, visit Neurogen to inspect the Systems and Components subject to
          Acceptance Testing. At these visits Pfizer IT staff may also test AIDD
          Units and Components;  provided,  however,  that these tests have been
          mutually  agreed.  During such process,  Neurogen staff may attend and
          provide guidance to Pfizer IT staff.

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          Within  fourteen  (14)  days  of  such  notice,   Pfizer  staff,  with
          Neurogen's  assistance will execute the Acceptance Testing protocol on
          the Pfizer AIDD Unit and notify Neurogen of such results.  If the AIDD
          Unit fails  Acceptance  Testing,

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          2.7 System Delivery, Installation, Maintenance and Repairs.

               2.7.1  Delivery.  Neurogen shall deliver or cause to be delivered

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               2.7.2  Maintenance.  For

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               after the delivery date for

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               Neurogen shall provide

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          2.8 System and  Component  Development.  During the  Contract  Period,
     Neurogen  shall  perform

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          2.9 Improvements.

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          2.10  Diligent  Efforts.  Each  party  shall use  reasonably  diligent
     efforts to achieve  the  objectives  of the  Collaboration  Program and the
     Collaboration Plan.

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3. Payments.  Pfizer shall pay Neurogen for performance of  Collaboration  Plans
and delivery of Neurogen Technology to Pfizer according to the payment schedules
set forth in this Section.

          3.1 Neurogen Technology Platform Fee. In consideration of the transfer
     to Pfizer of System and Components,

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     Pfizer shall pay

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     to Neurogen

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     twenty-seven million dollars ($ 27,000,000.00), plus

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     Such amount shall be payable according to the following schedule:

          (a)
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          (b)

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          (c)

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          (d)

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          (e)

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          (f)

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     3.2 Equipment Fees. During the Contract Period,  under the direction of the
Steering  Committee,  Pfizer  shall

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     3.3

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     3.4  Success  Payments.

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     3.5  Records.  For

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from the conclusion of each year of the Agreement,  Neurogen shall keep complete
and  accurate  records  of  its  reimbursable   expenditures   pursuant  to  the
Collaboration  Program. The records shall conform to good accounting  principles
as applied to a similar company similarly situated.  Pfizer shall have the right
at its own expense during the term of this Agreement and during the subsequent

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period  to  appoint  an  independent   certified  public  accountant  reasonably
acceptable to Neurogen to inspect said records to verify the  reimbursability of
such  expenditures.  Upon reasonable  notice by Pfizer,  Neurogen shall make its
records available for inspection by the independent  certified public accountant
during  regular  business  hours at the place or places  where such  records are
customarily  kept, to verify  accuracy  concerning the  reimbursability  of such
expenditures.  This right of inspection shall not be exercised more than once in
any calendar  year and not more than once with  respect to records  covering any
specific period of time. All information  concerning the reimbursability of such
expenditures,  and  all  information  learned  in the  course  of any  audit  or
inspection,  shall be deemed to be Neurogen Confidential Information,  except to
the extent that it is necessary for Pfizer to reveal the information in order to
enforce any rights it may have  pursuant to this  Agreement or if  disclosure is
required  by  law.  The  failure  of  Pfizer  to  request  verification  of  any
expenditures of efforts before or during the

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period  shall  be  considered  acceptance  by  Pfizer  of  the  accuracy  of the
reimbursability of such  expenditures,  and Neurogen shall have no obligation to
maintain any records pertaining to such report or statement beyond such

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period.  The  finding  of such  inspection,  if any,  shall be  binding  on both
parties.

4. Treatment of Confidential Information

     4.1 Confidentiality

          4.1.1 Pfizer and Neurogen each recognize that the other's Confidential
     Information constitutes highly valuable, confidential information.  Subject
     to the terms and conditions of this Agreement, the obligations set forth in
     Section 4.3 and the licenses  granted in Section  5.2,  Pfizer and Neurogen
     each  agree  that  during  the  term of  this  Agreement  and

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     thereafter,  it will keep  confidential,  and will cause its  Affiliates to
     keep  confidential,   all  Neurogen  Confidential   Information  or  Pfizer
     Confidential  Information,  as the case may be, that is disclosed to it, or
     to any of its  Affiliates  pursuant to this  Agreement.  Neither Pfizer nor
     Neurogen nor any of their respective Affiliates shall use such Confidential
     Information   except   as   expressly    permitted   in   this   Agreement.
     Notwithstanding  the above, if Neurogen notifies Pfizer not less than sixty
     (60) days prior to the expiration of

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     period  referred to above that certain  Neurogen  Confidential  Information
     continues  to be treated by  Neurogen  as  confidential,  Pfizer  agrees to
     extend such

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     for

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     with respect to the subject matter of this notice.

          4.1.2  Pfizer  and  Neurogen  each agree  that any  disclosure  of the
     other's Confidential  Information to any officer,  employee or agent of the
     other  party or of any of its  Affiliates  shall be made only if and to the
     extent necessary to carry out its responsibilities under this Agreement and
     shall be  limited  to the  maximum  extent  possible  consistent  with such
     responsibilities.  Pfizer  and  Neurogen  each  agree not to  disclose  the
     other's   Confidential   Information   to  any  Third   parties  under  any
     circumstance  without written  permission from the other party.  Each party
     shall take such action, and shall cause its Affiliates to take such action,
     to preserve the confidentiality of each other's Confidential Information as
     it  would  customarily  take to  preserve  the  confidentiality  of its own
     Confidential Information. Each party, upon the other's request, will return
     all the Confidential  Information  disclosed to the other party pursuant to
     this  Agreement,  including  all copies and extracts of  documents,  within
     sixty  (60) days of the  request  upon the  termination  of this  Agreement
     except for one (1) copy which may be kept for the purpose of complying with
     continuing obligations under this Agreement.

          4.1.3  Neurogen and Pfizer each  represent  that all of its employees,
     and any  subcontractors or consultants to such party,  participating in the
     Collaboration  Program  who  shall  have  access to  Pfizer  Technology  or
     Neurogen  Technology  and  Pfizer  Confidential  Information  and  Neurogen
     Confidential   Information   are  bound  by  agreement  to  maintain   such
     information in confidence.

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     4.3  Publicity.  Except as required by law,  neither party may disclose the
terms of this Agreement nor the  Collaboration  Program  described in it without
the written consent of the other party,  which consent shall not be unreasonably
withheld.

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     4.4  Disclosure of Inventions.

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     4.5 Restrictions on Transferring  Materials.  Pfizer and Neurogen recognize
that  the  chemical  protocols,  software  algorithms,  synthetic  chemical  and
biochemical   materials  which  are  part  of  Pfizer   Technology  or  Neurogen
Technology,  represent  valuable  commercial assets.  Therefore,  throughout the
Contract Period and

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thereafter,  Neurogen  and  Pfizer  agree  not to  transfer  such  materials  or
materials of the other party to any third party,  unless prior  written  consent
for any such transfer is obtained from the other party.

5. Intellectual  Property Rights.  The following  provisions relate to rights in
the intellectual  property  developed by Neurogen or Pfizer,  or both during the
course of carrying out the Collaboration Program.

     5.1 Ownership.

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     5.2 Grant of  License.  (a)  Neurogen  hereby  grants to Pfizer a

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license including the right to grant sublicenses  solely to Affiliates,  to make
and  use  Neurogen  Technology,  Neurogen  Confidential  Information,   Neurogen
Copyrights and Neurogen Patent Rights

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The license granted  hereunder is without any right to sublicense (other than to
Affiliates),  assign,  sell  or  otherwise  transfer  any  Neurogen  Technology,
Neurogen  Confidential  Information or Neurogen  Copyrights and Neurogen  Patent
Rights to any third  party.  (b) In so far as the System or Neurogen  Technology
licensed to Pfizer hereunder  included any hardware or software of a third party
such  items are listed in the  Collaboration  Plan and  Exhibit E ("Third  Party
Software"), which is attached to and made a part of this Agreement

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          5.2.1  Chemistry.   This  Agreement  confers  no  license,   right  or
     obligation  upon either  party with  respect to

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          AIDD  Software.  Pfizer  agrees  not to

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6.  Provisions  Concerning  the Filing,  Prosecution  and  Maintenance of Patent
Rights.

     6.1 Patent  Rights  Assignments.  Each party  agrees to complete at its own
expense,  but without  further  compensation  to the other party,  any documents
necessary for either party to file patent  applications and to prosecute patents
with respect to its own Patent Rights.

     6.2 Duties.  Neurogen shall be responsible for the filing,  prosecution and
maintaining  all  Neurogen  Patent  Rights and  Copyrights  and Pfizer  shall be
responsible for filing,  prosecution and maintaining of Pfizer Patent Rights and
Copyrights.  Each  party  agrees to  cooperate  in the  preparation,  filing and
prosecution of any Patent Rights or Copyrights  arising under the  Collaboration
Plan at the other's expense. The parties neither bear nor assume any obligations
to  patent  or  copyright  any  technology   contemplated   in  this  Agreement.
Notwithstanding  anything in this Agreement to the contrary,  neither party will
file any patent application, which does not comply with such party's obligations
of confidentiality to the other party pursuant to Section 4.1.

     6.3 Further Inventions. Intellectual Property rights with respect to System
or Improvements  developed or acquired by Pfizer

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     7. Other Agreements.  This Agreement,  together with its Exhibits set forth
the entire agreement  between the parties with respect to the subject matter and
supersede  all other  agreements  and  understandings  between the parties  with
respect to the same.

8. Term, Termination and Disengagement.

     8.1 Term. Unless sooner terminated or extended, this Agreement shall expire

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 from the Effective Date.

     8.2 Events of Termination.  The following events shall constitute events of
termination ("Events of Termination"):

          (a) any  material  written  representation  or warranty by Neurogen or
     Pfizer,  or any of its  officers,  made  under or in  connection  with this
     Agreement  shall prove to have been incorrect in any material  respect when
     made.

          (b) Neurogen or Pfizer  shall fail in any material  respect to perform
     or observe any term, covenant or understanding  contained in this Agreement
     or in any of the other documents or instruments  delivered  pursuant to, or
     concurrently  with,  this  Agreement,  and any such  failure  shall  remain
     unremedied  for

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     after written notice to the failing party; or

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     after written  notice,  if the failing party is working  diligently to cure
     the failure.

     8.3 Termination.

          8.3.1 Upon the occurrence of any Event of  Termination,  the party not
     responsible may, by notice to the other party, terminate this Agreement.

          8.3.2 If Pfizer  terminates this Agreement  pursuant to Section 8.3.1,
     or upon  expiration  of this  Agreement  pursuant to Section 8.1,  Pfizer's
     rights to Neurogen Technology, granted in Section 5 shall

                          [CONFIDENTIAL MATERIAL OMITTED
                          AND FILED SEPARATELY WITH THE
                       SECURITIES AND EXCHANGE COMMISSION].

          8.3.3  Termination  of this  Agreement for any reason shall be without
     prejudice to:
          (a) the  rights  and  obligations  of the  parties  provided  in those
          Sections which by virtue of their term and condition extend beyond any
          termination of this Agreement.
          (b) Neurogen's  right to receive all payments  accrued under Section 3
          through the effective date of termination; or
          (c) any other remedies which either party may otherwise have.

9.  Representations  and  Warranties.  Neurogen and Pfizer each  represents  and
warrants as follows:
     (a) It is a corporation  duly  organized,  validly  existing and is in good
standing under the laws of Delaware,  is qualified to do business and is in good
standing as a foreign  corporation in each  jurisdiction in which the conduct of
its business of the ownership of its properties  requires such qualification and
has all requisite  power and authority,  corporate or otherwise,  to conduct its
business as now being conducted, to own, lease and operate its properties and to
execute, deliver and perform this Agreement.

     (b) The  execution,  delivery and  performance by it of this Agreement have
been duly authorized by all necessary  corporate  action and do not and will not
(i)  require  any consent or  approval  of its  stockholders,  (ii)  violate any
provision of any law, rule,  regulations,  order, writ,  judgment,  injunctions,
decree,  determination  award presently in effect having  applicability to it or
any provision of its certificate of  incorporation or by-laws or (iii) result in
a breach of or  constitute  a default  under any material  agreement,  mortgage,
lease, license,  permit or other instrument or obligation to which it is a party
or by which it or its properties may be bound or affected.

     (c)  This  Agreement  is a  legal,  valid  and  binding  obligation  of  it
enforceable by it in accordance  with its terms and  conditions,  except as such
enforceability may be limited by applicable bankruptcy,  insolvency, moratorium,
reorganization  or  similar  laws,  from  time  to  time  in  effect,  affecting
creditor's rights generally.

     (d) It is not under any obligation to any person, or entity, contractual or
otherwise,  that is conflicting or inconsistent in any respect with the terms of
this Agreement or that would impede the diligent and complete fulfillment of its
obligations. (e) It has good and marketable title to or valid leases or licenses
for, all of its properties,  rights and assets  necessary for the fulfillment of
its responsibilities under the Collaboration Program, and is subject to no claim
of any third party other than the relevant lessors or licensors.

10.  Covenants  of  Neurogen  and  Pfizer  Other  Than  Reporting  Requirements.
Throughout the Contract Period, Neurogen and Pfizer each shall:

     (a) maintain and preserve its corporate existence,  rights,  franchises and
privileges  in the  jurisdiction  of its  incorporation,  and qualify and remain
qualified as a foreign  corporation  in good  standing in each  jurisdiction  in
which such  qualification is from time to time necessary or desirable in view of
their business and operations or the ownership of their  properties.

     (b) comply in all material respects with the requirements of all applicable
laws,  rules,  regulations and orders of any government  authority to the extent
necessary to conduct the  Collaboration  Program,  except for those laws, rules,
regulations, and orders it may be contesting in good faith.

     11.  Indemnification.  Pfizer will indemnify  Neurogen and its  Affiliates,
agents and employees (the "Indemnitees") for damages, settlements,  costs, legal
fees and other expenses  incurred in connection  with a claim against any of the
Indemnitees based on

                          [CONFIDENTIAL MATERIAL OMITTED
                          AND FILED SEPARATELY WITH THE
                       SECURITIES AND EXCHANGE COMMISSION]

provided,  however, that the foregoing shall not apply (i) if the claim is found
to be based upon the

                          [CONFIDENTIAL MATERIAL OMITTED
                          AND FILED SEPARATELY WITH THE
                       SECURITIES AND EXCHANGE COMMISSION]

of Neurogen or (ii) if Neurogen

                         [CONFIDENTIAL MATERIAL OMITTED
                          AND FILED SEPARATELY WITH THE
                       SECURITIES AND EXCHANGE COMMISSION].

12. Notices.  All notices shall be in writing mailed via certified mail,  return
receipt requested,  courier, or facsimile  transmission addressed as follows, or
to such other address as may be designated from time to time:

If to Pfizer:  To Pfizer at its  address as set forth at the  beginning  of this
Agreement.
Attention: President, Central Research
with copy to: Office of the General Counsel

If to Neurogen: To Neurogen at its address as set forth at the beginning of this
Agreement.
Attention: President
with copy to: General Counsel

Notices shall be deemed given as of the date received.

13.  Governing  Law.  This  Agreement  shall be  governed  by and  construed  in
accordance with the laws of the State of Delaware, USA.

14. Miscellaneous.

     14.1 Binding Effect.  This Agreement shall be binding upon and inure to the
benefit of the parties and their  respective legal  representatives,  successors
and permitted assigns.

     14.2 Headings. Paragraph headings are inserted for convenience of reference
only and do not form, a part of this Agreement.

     14.3 Counterparts.  This Agreement may be executed simultaneously in two or
more counterparts, each of which shall be deemed an original.

     14.4 Amendment, Waiver. This Agreement may be amended, modified, superseded
or canceled,  and any of the terms may be waived,  only by a written  instrument
executed  by each  party or,  in the case of  waiver,  by the  party or  parties
waiving  compliance.  The delay or  failure of any party at any time or times to
require  performance of any provisions shall in no manner affect the rights at a
later time to enforce the same.  No waiver by any party of any  condition  or of
the breach of any term  contained  in this  Agreement,  whether by  conduct,  or
otherwise,  in any one or more  instances,  shall be deemed to be, or considered
as, a further or  continuing  waiver of any such  condition  or of the breach of
such term or any other term of this Agreement.

     14.5 No third party Beneficiaries.  Except as otherwise provided in Section
11, no third party  including any employee of any party to this Agreement  shall
have or acquire any rights by reason of this  Agreement.  Nothing  contained  in
this  Agreement  shall be deemed to  constitute  the parties  partners with each
other or any third party.

     14.6  Assignment  and  Successors.  This  Agreement  may not be assigned by
either  party,  except that each party may assign this  Agreement and the rights
and interests of such party, in whole or in part, to any of its Affiliates,  any
purchaser  of  all  or  substantially  all of  its  assets  or to any  successor
corporation  resulting  from any merger or  consolidation  of such party with or
into such corporations.

     14.7 Force Majeure. Neither Pfizer nor Neurogen shall be liable for failure
of or delay in performing  obligations set forth in this Agreement,  and neither
shall be deemed in breach of its obligations, if such failure or delay is due to
natural  disasters  or any causes  reasonably  beyond  the  control of Pfizer or
Neurogen.

     14.8 Severability. If any provision of this Agreement is or becomes invalid
or is  ruled  invalid  by any  court  of  competent  jurisdiction  or is  deemed
unenforceable,  it is the  intention of the parties,  that the  remainder of the
Agreement shall not be affected.

     14.9  Y2K  Compliance.  During  the  Contract  Period  Neurogen  represents

                         [CONFIDENTIAL MATERIAL OMITTED
                          AND FILED SEPARATELY WITH THE
                       SECURITIES AND EXCHANGE COMMISSION].





<PAGE>

IN WITNESS  WHEREOF,  the parties  have caused this  Agreement to be executed by
their duly authorized representatives.


 PFIZER INC                                  NEUROGEN CORPORATION
 By: /s/ George Milne                        By: /s/  Harry H. Penner, Jr.
 Title:  Senior Vice President               Title:   President/CEO
 Date:   June 14, 1999                       Date:    June 15, 1999

<PAGE>








                                    EXHIBIT A (1)

                           NEUROGEN TECHNOLOGY PATENTS
                          COPYRIGHTS AND TRADE SECRETS


                                    EXHIBIT B (2)

                    AIDD DELIVERABLES AND ACCEPTANCE CRITERIA


                                    EXHIBIT C (3)

                               AIDD UNIT EQUIPMENT


                                    EXHIBIT D (4)

                               COLLABORATION PLAN


                                    EXHIBIT E (5)

                              THIRD PARTY SOFTWARE


(1)  Exhibit  A (40  pages)  omitted  pursuant  to a  request  for  confidential
     treatment and filed separately.

(2)  Exhibit  B (1  page)  omitted  pursuant  to  a  request   for  confidential
     treatment and filed separately.

(3)  Exhibit  C (20  pages)  omitted  pursuant  to a  request  for  confidential
     treatment and filed separately.

(4)  Exhibit  D (12  pages)  omitted  pursuant  to a  request  for  confidential
     treatment and filed separately.

(5)  Exhibit  E (1  page)  omitted  pursuant  to  a  request   for  confidential
     treatment and filed separately.












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