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UNITED STATES

SECURITIES AND
EXCHANGE COMMISSION

WASHINGTON, DC 20549



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FORM 10-Q



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(Mark One)

|x | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ---------------------------------------------------------------------------------------



| | FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2006
| | ---------------------------------------------



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------



| | FOR THE TRANSITION PERIOD FROM                      TO
| | ------------------------------------------------------

Commission file number: 000-51133



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MEDICINOVA, INC.

(Exact name of registrant as specified in its charter)



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|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|Delaware                                                       |  | 33-0927979                          
|(State or Other Jurisdiction of Incorporation or Organization) |  | (I.R.S. Employer Identification No.)
|                                                               | 
|4350 La Jolla Village Drive, Suite 950, San Diego, CA          |  | 92122                               
|(Address of Principal Executive Offices)                       |  | (Zip Code)                          

(858) 373-1500

(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 ̈

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of
accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):



|                         |  |                     |  |                       
|------------------------ |  | ------------------- |  | ----------------------
|Large accelerated filer ̈ |  | Accelerated filer x |  | Non-accelerated filer ̈

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the
Exchange Act).    Yes ̈No  x

As of May 5, 2006, the registrant had 99,907,856 shares of Common Stock ($0.001 par value) outstanding.



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

TABLE OF CONTENTS



|                              |  |                                                                                       |  |   
|----------------------------- |  | ------------------------------------------------------------------------------------- |  | --
|PART I. FINANCIAL INFORMATION |  | 3                                                                                    
|                              |  |                                                                                      
|ITEM 1.                       |  | FINANCIAL STATEMENTS                                                                  |  | 3 
|ITEM 2.                       |  | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS |  | 12
|ITEM 3.                       |  | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK                            |  | 17
|ITEM 4.                       |  | CONTROLS AND PROCEDURES                                                               |  | 17
|                              | 
|PART II. OTHER INFORMATION    |  | 18                                                                                   
|                              |  |                                                                                      
|ITEM 1.                       |  | LEGAL PROCEEDINGS                                                                     |  | 18
|ITEM 1A.                      |  | RISK FACTORS                                                                          |  | 18
|ITEM 2.                       |  | UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS                           |  | 30
|ITEM 3.                       |  | DEFAULTS UPON SENIOR SECURITIES                                                       |  | 31
|ITEM 4.                       |  | SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS                                   |  | 31
|ITEM 5.                       |  | OTHER INFORMATION                                                                     |  | 32
|ITEM 6.                       |  | EXHIBITS                                                                              |  | 32
|                              | 
|SIGNATURES                    |  | 33                                                                                   
|                              | 
|EXHIBIT 31.1                  |  |                                                                                      
|EXHIBIT 31.2                  |  |                                                                                      
|EXHIBIT 32.1                  |  |                                                                                      
|EXHIBIT 32.2                  |  |                                                                                      



2



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##### Table of Contents

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

MEDICINOVA, INC.

(a development stage company)

BALANCE SHEETS



|                                                                                                                                                                                                      |  |                |              |   |                  |   |              |  
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------- | ------------ | - | ---------------- | - | ------------ | -
|                                                                                                                                                                                                      |  | March 31, 2006 |              |   | December 31,2005 |  
|                                                                                                                                                                                                      |  | (Unaudited)    |              |   |                  |  
|Assets                                                                                                                                                                                                |  |                |              |   |                  |   |              |  
|Current assets:                                                                                                                                                                                       |  |                |              |   |                  |   |              |  
|Cash and cash equivalents                                                                                                                                                                             |  | $              | 19,860,034   |   |                  | $ | 37,677,985   |  
|Marketable securities available-for-sale                                                                                                                                                              |  |                | 111,522,445  |   |                  |   | 101,022,899  |  
|Prepaid expenses and other current assets                                                                                                                                                             |  |                | 2,023,034    |   |                  |   | 2,558,529    |  
|                                                                                                                                                                                                      |  |                |              |   |                  |   |              |  
|Total current assets                                                                                                                                                                                  |  |                | 133,405,513  |   |                  |   | 141,259,413  |  
|Property and equipment, net                                                                                                                                                                           |  |                | 1,092,510    |   |                  |   | 1,134,297    |  
|                                                                                                                                                                                                      |  |                |              |   |                  |   |              |  
|Total assets                                                                                                                                                                                          |  | $              | 134,498,023  |   |                  | $ | 142,393,710  |  
|                                                                                                                                                                                                      |  |                |              |   |                  |   |              |  
|Liabilities and Stockholders Equity                                                                                                                                                                  |  |                |              |   |                  |   |              |  
|Current liabilities:                                                                                                                                                                                  |  |                |              |   |                  |   |              |  
|Accounts payable                                                                                                                                                                                      |  | $              | 1,751,628    |   |                  | $ | 1,379,982    |  
|Accrued expenses                                                                                                                                                                                      |  |                | 5,299,630    |   |                  |   | 4,341,427    |  
|Accrued compensation and related expenses                                                                                                                                                             |  |                | 221,896      |   |                  |   | 905,016      |  
|                                                                                                                                                                                                      |  |                |              |   |                  |   |              |  
|Total current liabilities                                                                                                                                                                             |  |                | 7,273,154    |   |                  |   | 6,626,425    |  
|Deferred rent                                                                                                                                                                                         |  |                | 56,219       |   |                  |   | 59,506       |  
|Commitments                                                                                                                                                                                           |  |                |              |   |                  |   |              |  
|Stockholders equity:                                                                                                                                                                                 |  |                |              |   |                  |   |              |  
|Common stock, $0.001 par value; 200,000,000 shares authorized at March 31, 2006 and December 31, 2005; 100,705,856 and 98,855,856 shares
issued at March 31, 2006 and December 31, 2005, respectively |  |                | 100,706      |   |                  |   | 98,856       |  
|Additional paid-in capital                                                                                                                                                                            |  |                | 256,871,747  |   |                  |   | 256,943,520  |  
|Deferred employee stock-based compensation                                                                                                                                                            |  |                |             |   |                  |   | (799,439     | )
|Accumulated other comprehensive loss                                                                                                                                                                  |  |                | (14,484      | ) |                  |   | (15,188      | )
|Treasury stock, at cost; 798,000 and 50,000 shares at March 31, 2006 and December 31, 2005, respectively                                                                                              |  |                | (875,311     | ) |                  |   | (55,445      | )
|Deficit accumulated during the development stage                                                                                                                                                      |  |                | (128,914,008 | ) |                  |   | (120,464,525 | )
|                                                                                                                                                                                                      |  |                |              |   |                  |   |              |  
|Total stockholders equity                                                                                                                                                                            |  |                | 127,168,650  |   |                  |   | 135,707,779  |  
|                                                                                                                                                                                                      |  |                |              |   |                  |   |              |  
|Total liabilities and stockholders equity                                                                                                                                                            |  | $              | 134,498,023  |   |                  | $ | 142,393,710  |  
|                                                                                                                                                                                                      |  |                |              |   |                  |   |              |  

See accompanying notes.



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

STATEMENTS OF OPERATIONS

(Unaudited)



|                                                                                                                |  |                              |            |   |                                                          |   |            |   |  |   |              |  
|--------------------------------------------------------------------------------------------------------------- |  | ---------------------------- | ---------- | - | -------------------------------------------------------- | - | ---------- | - |  | - | ------------ | -
|                                                                                                                |  | Three months ended March 31, |            |   | Period fromSeptember 26,2000 (inception)to March 31,2006 |  
|                                                                                                                |  | 2006                         |            |   | 2005                                                     |   |           
|Revenues                                                                                                        |  | $                            | 192,204    |   |                                                          | $ | 1,860      |   |  | $ | 1,486,554    |  
|Operating expenses:                                                                                             |  |                              |            |   |                                                          |   |            |   |  |   |              |  
|Cost of revenues                                                                                                |  |                              | 91,881     |   |                                                          |   | 1,039      |   |  |   | 1,203,695    |  
|Research and development                                                                                        |  |                              | 7,752,250  |   |                                                          |   | 4,129,792  |   |  |   | 53,305,354   |  
|General and administrative                                                                                      |  |                              | 2,204,709  |   |                                                          |   | 1,369,507  |   |  |   | 51,094,895   |  
|                                                                                                                |  |                              |            |   |                                                          |   |            |   |  |   |              |  
|Total operating expenses                                                                                        |  |                              | 10,048,840 |   |                                                          |   | 5,500,338  |   |  |   | 105,603,944  |  
|                                                                                                                |  |                              |            |   |                                                          |   |            |   |  |   |              |  
|Operating loss                                                                                                  |  |                              | (9,856,636 | ) |                                                          |   | (5,498,478 | ) |  |   | (104,117,390 | )
|Interest income                                                                                                 |  |                              | 1,407,153  |   |                                                          |   | 659,407    |   |  |   | 6,566,504    |  
|                                                                                                                |  |                              |            |   |                                                          |   |            |   |  |   |              |  
|Net loss                                                                                                        |  |                              | (8,449,483 | ) |                                                          |   | (4,839,071 | ) |  |   | (97,550,886  | )
|Accretion to redemption value of redeemable convertible preferred stock                                         |  |                              |           |   |                                                          |   | (19,689    | ) |  |   | (98,445      | )
|Deemed dividend resulting from beneficial conversion feature on Series C redeemable convertible preferred stock |  |                              |           |   |                                                          |   |           |   |  |   | (31,264,677  | )
|                                                                                                                |  |                              |            |   |                                                          |   |            |   |  |   |              |  
|Net loss applicable to common stockholders                                                                      |  | $                            | (8,449,483 | ) |                                                          | $ | (4,858,760 | ) |  | $ | (128,914,008 | )
|                                                                                                                |  |                              |            |   |                                                          |   |            |   |  |   |              |  
|Basic and diluted net loss per common share (1)                                                                 |  | $                            | (0.09      | ) |                                                          | $ | (0.08      | ) |  |   |              |  
|                                                                                                                |  |                              |            |   |                                                          |   |            |   |  |   |              |  
|Shares used to compute basic and diluted net loss per share                                                     |  |                              | 99,277,800 |   |                                                          |   | 60,047,068 |   |  |   |              |  
|                                                                                                                |  |                              |            |   |                                                          |   |            |   |  |   |              |  

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|(1) | As a result of the conversion of our preferred stock into 66,782,856 shares of our common stock upon completion of our IPO in February 2005, there is a lack of comparability in the
basic and diluted net loss per share amounts for the periods presented above. Please refer to Note 3 for the pro forma basic and diluted net loss per share calculations for the periods presented.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



See accompanying notes.



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

STATEMENTS OF CASH FLOWS

(Unaudited)



|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|--------------------------------------------------------------------------- |  | ---------------------------- | ----------- | - | -------------------------------------------------------- | - | ----------- | - |  | - | ------------ | -
|                                                                            |  | Three months ended March 31, |             |   | Period fromSeptember 26,2000 (inception)to March 31,2006 |  
|                                                                            |  | 2006                         |             |   | 2005                                                     |   |            
|Operating activities:                                                       |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Net loss                                                                    |  | $                            | (8,449,483  | ) |                                                          | $ | (4,839,071  | ) |  | $ | (97,550,886  | )
|Adjustments to reconcile net loss to net cash used in operating activities: |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Non-cash stock-based compensation                                           |  |                              | 604,516     |   |                                                          |   | 86,133      |   |  |   | 35,338,168   |  
|Depreciation and amortization                                               |  |                              | 76,228      |   |                                                          |   | 23,167      |   |  |   | 393,901      |  
|Amortization of premium/discount on marketable securities                   |  |                              | (286,211    | ) |                                                          |   |            |   |  |   | (1,154,583   | )
|Impairment of property and equipment                                        |  |                              | 35,259      |   |                                                          |   |            |   |  |   | 35,259       |  
|Changes in operating assets and liabilities:                                |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Prepaid expenses and other assets                                           |  |                              | 535,495     |   |                                                          |   | (1,365,802  | ) |  |   | (2,023,034   | )
|Accounts payable, accrued expenses and deferred rent                        |  |                              | 1,326,562   |   |                                                          |   | 1,236,002   |   |  |   | 7,107,477    |  
|Accrued compensation and related expenses                                   |  |                              | (683,120    | ) |                                                          |   | (323,347    | ) |  |   | 221,896      |  
|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Net cash used in operating activities                                       |  |                              | (6,840,754  | ) |                                                          |   | (5,182,918  | ) |  |   | (57,631,802  | )
|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Investing activities:                                                       |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Purchases of marketable securities available-for-sale                       |  |                              | (35,962,631 | ) |                                                          |   | (77,400,000 | ) |  |   | (261,282,346 | )
|Maturities of marketable securities available-for-sale                      |  |                              | 25,750,000  |   |                                                          |   | 13,500,000  |   |  |   | 150,900,000  |  
|Acquisition of property and equipment, net                                  |  |                              | (69,700     | ) |                                                          |   | (194,640    | ) |  |   | (1,716,491   | )
|Proceeds from sales of property and equipment                               |  |                              |            |   |                                                          |   |            |   |  |   | 194,821      |  
|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Net cash used in investing activities                                       |  |                              | (10,282,331 | ) |                                                          |   | (64,094,640 | ) |  |   | (111,904,016 | )
|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Financing activities:                                                       |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Net proceeds from the sale of common stock                                  |  |                              | 125,000     |   |                                                          |   | 111,968,730 |   |  |   | 110,054,192  |  
|Sale of preferred stock, net of issuance costs                              |  |                              |            |   |                                                          |   |            |   |  |   | 80,216,971   |  
|Purchase of treasury stock                                                  |  |                              | (819,866    | ) |                                                          |   |            |   |  |   | (875,311     | )
|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Net cash provided by (used in) financing activities                         |  |                              | (694,866    | ) |                                                          |   | 111,968,730 |   |  |   | 189,395,852  |  
|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Net increase (decrease) in cash and cash equivalents                        |  |                              | (17,817,951 | ) |                                                          |   | 42,691,172  |   |  |   | 19,860,034   |  
|Cash and cash equivalents, beginning of period                              |  |                              | 37,677,985  |   |                                                          |   | 38,801,328  |   |  |   |             |  
|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  
|Cash and cash equivalents, end of period                                    |  | $                            | 19,860,034  |   |                                                          | $ | 81,492,500  |   |  | $ | 19,860,034   |  
|                                                                            |  |                              |             |   |                                                          |   |             |   |  |   |              |  



See accompanying notes.



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

Notes to Financial Statements

(Unaudited)

1. Interim Financial Information

The Company

We were
incorporated in the state of Delaware in September 2000. We are a specialty pharmaceutical company focused on the acquisition, development and commercialization of innovative pharmaceutical products. Our development pipeline, which includes six
compounds in clinical testing, target a variety of prevalent medical conditions, including asthma, cancer, interstitial cystitis, generalized anxiety disorder, urinary incontinence and multiple sclerosis. We are focused primarily on the development
of our existing programs at the present time and do not foresee material acquisitions of product candidates in the near term.

Basis of Presentation

We have prepared the accompanying unaudited financial statements in accordance with accounting principles generally accepted in the
United States of America for interim financial information. Accordingly, they do not include all of the information and disclosures required by generally accepted accounting principles for complete financial statements. In the opinion of our
management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2006 are not necessarily indicative of the results
that may be expected for the twelve months ending December 31, 2006 or for any other period. For further information, see the financial statements and disclosures thereto for the year ended December 31, 2005 in our Annual Report on Form
10-K filed with the Securities and Exchange Commission.

2. Marketable Securities Available-for-Sale

Marketable securities available-for-sale consist of certificates of deposit, high-grade auction rate securities (ARS), corporate debt
securities and U.S. government debt securities. All of the corporate debt securities and U.S. government debt securities have contractual maturities of 12 months or less as of March 31, 2006. The ARS have either a stated or perpetual
maturity that is structured with short-term holding periods. At the end of each holding period, a new auction is held to determine the rate or dividend for the next holding period. We can sell or continue to hold securities at par at each auction.
In order for us to sell ARS, the auction needs to be successful whereby demand in the marketplace exceeds the supply. The length of each holding period is determined at the original issuance of the ARS. Typically, ARS holding periods range from 7 to
63 days. As of March 31, 2006, our ARS consisted of $32,300,000 of perpetual securities and $52,300,000 with stated maturity dates ranging from 2022 to 2044 and reset dates of up to 63 days.



|                                |  |                |             |                   |        |     |  |            |                |   |                  |   |             |            |   |             |  |   |     |  |   |         |   |  |   |            
|------------------------------- |  | -------------- | ----------- | ----------------- | ------ | --- |  | ---------- | -------------- | - | ---------------- | - | ----------- | ---------- | - | ----------- |  | - | --- |  | - | ------- | - |  | - | -----------
|                                |  | March 31, 2006 |             | December 31, 2005
|                                |  | AmortizedCost  |             | Gross Unrealized  |        |     |  |            | Amortized Cost |   | Gross Unrealized |   |             | Fair Value
|                                |  |                | Gains       |                   | Losses |     |  | Fair Value |                |   | Gains            |   | Losses      |            |  
|Certificates of deposit         |  | $              | 253,000     |                   | $      |    |  | $          | (795           | ) |                  | $ | 252,205     |            | $ | 503,000     |  | $ |    |  | $ | (2,381  | ) |  | $ | 500,619    
|Auction rate securities         |  |                | 84,600,000  |                   |        |    |  |            |               |   |                  |   | 84,600,000  |            |   | 69,750,000  |  |   |    |  |   |        |   |  |   | 69,750,000 
|Corporate debt securities       |  |                | 9,876,202   |                   |        | 193 |  |            | (5,055         | ) |                  |   | 9,871,340   |            |   | 19,897,789  |  |   | 390 |  |   | (7,999  | ) |  |   | 19,890,180 
|U.S. government debt securities |  |                | 16,807,727  |                   |        | 260 |  |            | (9,087         | ) |                  |   | 16,798,900  |            |   | 10,887,298  |  |   | 538 |  |   | (5,736  | ) |  |   | 10,882,100 
|                                |  |                |             |                   |        |     |  |            |                |   |                  |   |             |            |   |             |  |   |     |  |   |         |   |  |   |            
|                                |  | $              | 111,536,929 |                   | $      | 453 |  | $          | (14,937        | ) |                  | $ | 111,522,445 |            | $ | 101,038,087 |  | $ | 928 |  | $ | (16,116 | ) |  | $ | 101,022,899
|                                |  |                |             |                   |        |     |  |            |                |   |                  |   |             |            |   |             |  |   |     |  |   |         |   |  |   |            

As of March 31, 2006, the unrealized losses on the certificates of deposit, corporate debt
securities and U.S. government securities were primarily caused by recent increases in interest rates. Based on an evaluation of the credit standing of each issuer, management believes it is probable that we will be able to collect all amounts due



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

Notes to Financial Statements(Continued)

(Unaudited)



according to the contractual terms. We had no realized losses on sales of investment securities available-for-sale for the period ended March 31, 2006.

3. Net Loss Per Share

Basic net loss
per share attributable to common stockholders is calculated by dividing the net loss by the weighted average number of common shares outstanding for the period, without consideration for common stock equivalents. Diluted net loss per share is
computed by dividing the net loss attributable to common stockholders by the weighted average number of common share equivalents outstanding for the period determined using the treasury-stock method. For purposes of this calculation, convertible
preferred stock, stock options, and warrants are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive.

The unaudited pro forma basic and diluted net loss per share is calculated by dividing the pro forma net loss by the weighted average number of common
shares outstanding for the period plus the weighted average number of common shares resulting from the assumed conversion of the outstanding shares of convertible preferred stock. The assumed conversion is calculated using the as-if-converted
method, as if such conversion had occurred as of the beginning of each period presented or the original issuance, if later. The pro forma net loss is calculated by subtracting the accretion to redemption value of redeemable convertible preferred
stock from the net loss applicable to common stockholders.



|                                                                                                       |  |                              |            |   |      |   |            |  
|------------------------------------------------------------------------------------------------------ |  | ---------------------------- | ---------- | - | ---- | - | ---------- | -
|                                                                                                       |  | Three months ended March 31, |           
|                                                                                                       |  | 2006                         |            |   | 2005 |  
|Historical                                                                                             |  |                              |            |   |      |   |            |  
|Numerator:                                                                                             |  |                              |            |   |      |   |            |  
|Net loss                                                                                               |  | $                            | (8,449,483 | ) |      | $ | (4,839,071 | )
|Accretion to redemption value of redeemable convertible preferred stock                                |  |                              |           |   |      |   | (19,689    | )
|                                                                                                       |  |                              |            |   |      |   |            |  
|Net loss applicable to common stockholders                                                             |  | $                            | (8,449,483 | ) |      | $ | (4,858,760 | )
|                                                                                                       |  |                              |            |   |      |   |            |  
|Denominator:                                                                                           |  |                              |            |   |      |   |            |  
|Weighted average common shares outstanding                                                             |  |                              | 99,277,800 |   |      |   | 60,047,068 |  
|                                                                                                       |  |                              |            |   |      |   |            |  
|Basic and diluted net loss per share                                                                   |  | $                            | (0.09      | ) |      | $ | (0.08      | )
|                                                                                                       |  |                              |            |   |      |   |            |  
|Pro Forma                                                                                              |  |                              |            |   |      |   |            |  
|Pro forma net loss                                                                                     |  |                              |            |   |      | $ | (4,839,071 | )
|                                                                                                       |  |                              |            |   |      |   |            |  
|Pro forma basic and diluted net loss per share                                                         |  |                              |            |   |      | $ | (0.06      | )
|                                                                                                       |  |                              |            |   |      |   |            |  
|Shares used above                                                                                      |  |                              |            |   |      |   | 60,047,068 |  
|Pro forma adjustments to reflect assumed weighted average effect of conversion of preferred stock      |  |                              |            |   |      |   | 25,971,111 |  
|                                                                                                       |  |                              |            |   |      |   |            |  
|Pro forma shares used to compute basic and diluted net loss per share                                  |  |                              |            |   |      |   | 86,018,179 |  
|                                                                                                       |  |                              |            |   |      |   |            |  
|Historical outstanding anti-dilutive securities not included in diluted net loss per share calculation |  |                              |            |   |      |   |            |  
|Common stock warrants                                                                                  |  |                              | 11,446,724 |   |      |   | 13,356,572 |  
|Common stock options                                                                                   |  |                              | 7,404,708  |   |      |   | 1,550,000  |  



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

Notes to Financial Statements(Continued)

(Unaudited)



4. Comprehensive Income

We have adopted Statement of Financial Accounting Standards (SFAS) No. 130,Reporting Comprehensive Income, which requires that all components of comprehensive income, including net income, be
reported in the financial statements in the period in which they are recognized. Comprehensive income is defined as the change in equity during a period from transactions and other events and circumstances from non-owner sources. Net income and
other comprehensive income, including foreign currency translation adjustments and unrealized gains and losses on investments, shall be reported, net of their related tax effect, to arrive at comprehensive income. Comprehensive loss did not differ
significantly from net loss for all periods presented.

5. Share-Based Payments

We grant stock options to our employees and directors under the 2004 Stock Incentive Plan, the successor to the 2000 General Stock Incentive Plan.
Effective January 1, 2006, the benefits provided under these Plans is share-based compensation subject to the provisions of SFAS No. 123R. Prior to January 1, 2006, we accounted for share-based compensation related to stock options under
the recognition and measurement principles of Accounting Principles Board (APB) Opinion No. 25; therefore, we measured compensation expense for its stock options using the intrinsic value method, that is, as the excess, if any, of
the fair market value of our stock at the grant date over the amount required to be paid to acquire the stock, and provided the pro forma disclosures required by SFAS No. 123.

As a result of the adoption of SFAS No. 123R, our net loss for the three-months ended March 31, 2006 is approximately $0.5 million higher than if we
had continued to account for share-based compensation under APB No. 25. Basic and diluted net loss per share for the three-months ended March 31, 2006 would have been $0.09 per share if we had not adopted SFAS No. 123R. SFAS No. 123R requires
that cash flows resulting from tax deductions in excess of the cumulative compensation cost recognized for options exercised (excess tax benefits) be classified as cash inflows from financing activities and cash outflows from operating activities.
Due to our net loss position, no tax benefits have been recognized in the cash flow statement.

The exercise price of all options granted
during the three-month period ended March 31, 2006 was equal to the market value on the date of grant and no options were granted during the three months ended March 31, 2005; accordingly, no share-based compensation expense for such
options is reflected in operating results for the three months ended March 31, 2005. The estimated fair value of each option award was determined on the date of grant using the Black-Scholes option valuation model with the following
weighted-average assumptions for option grants:



|                                    |  |                                  |  
|----------------------------------- |  | -------------------------------- | -
|                                    |  | Three months endedMarch 31, 2006 |  
|Risk-free interest rate             |  | 4.35                             | %
|Expected volatility of common stock |  | 69.00                            | %
|Dividend yield                      |  | 0.00                             | %
|Expected option term (in years)     |  | 6.00                             |  

The risk-free interest rate assumption is based upon observed interest rates appropriate for the
expected term of our employee stock options. We used a weighted average of the historical stock price volatility of our stock and the historical stock price volatility of certain peers to calculate the expected volatility assumption required for the
Black-Scholes model consistent with SFAS 123R. Prior to fiscal 2006, we had used its historical stock price volatility in accordance with SFAS No. 123 for purposes of its pro forma information. The selection of the historical volatility approach
using a weighted average of our stock price and our peers stock prices was based



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

Notes to Financial Statements(Continued)

(Unaudited)



upon our assessment that this approach is more representative of future stock price trends than our historical volatility alone. We have not paid any
dividends on common stock since our inception and do not anticipate paying dividends on our common stock in the foreseeable future. The expected life of employee stock options represents the average of the life of the options and the average vesting
period, and is a derived output of the simplified method, as allowed under Staff Accounting Bulletin No. 107, Share-Based Payment.

As share-based compensation expense recognized in the accompanying statement of operations for the three months ended March 31, 2006 is based on awards ultimately expected to vest, it should be reduced for estimated forfeitures. SFAS
No. 123R requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Pre-vesting forfeitures were estimated to be 0% in the first quarter of fiscal
2006 based on historical experience. The effect of pre-vesting forfeitures on our recorded expense has historically been negligible due to the predominant monthly vesting of option grants. We will continue to monitor actual forfeitures and adjust
our estimated forfeiture rate if necessary. In our pro forma information required under SFAS No. 123 for the periods prior to fiscal 2006, we accounted for forfeitures as they occurred. Our determination of fair value is affected by our stock price
as well as a number of assumptions that require judgment. The weighted-average fair value of each option granted during the three months ended March 31, 2006, estimated as of the grant date using the Black-Scholes option valuation model, was
$0.77 per option.

For the three months ended March 31, 2006, share-based compensation expense related to stock options was
$0.6 million and was recorded as a component of general and administrative expense ($0.5 million) and research and development expense ($0.1 million). There were no stock option exercises during the three months ended March 31,
2006 and 2005. As such, no cash was received from stock option exercises for the three months ended March 31, 2006 and 2005.

For
stock options granted prior to the adoption of SFAS No. 123R, the following table illustrates the pro forma effect on net loss and loss per common share as if we had applied the fair value recognition provisions of SFAS No. 123 in determining
stock-based compensation for awards under the plan:



|                                                                                       |  |                                  |            |  
|-------------------------------------------------------------------------------------- |  | -------------------------------- | ---------- | -
|                                                                                       |  | Three months endedMarch 31, 2005 |           
|Net loss applicable to common stockholders, as reported                                |  | $                                | (4,858,760 | )
|Add: total stock-based employee compensation expense included in net loss              |  |                                  | 86,133     |  
|Less: stock-based employee compensation expense determined under the fair value method |  |                                  | (96,581    | )
|                                                                                       |  |                                  |            |  
|SFAS No. 123 pro forma net loss applicable to common stockholders                      |  | $                                | (4,869,208 | )
|                                                                                       |  |                                  |            |  
|Basic and diluted net loss per share, as reported                                      |  | $                                | (0.08      | )
|                                                                                       |  |                                  |            |  
|Basic and diluted net loss per share, pro forma under SFAS No. 123                     |  | $                                | (0.08      | )
|                                                                                       |  |                                  |            |  

As of March 31, 2006, there was $3.9 million of unamortized compensation cost related to
unvested stock option awards, which is expected to be recognized over a remaining weighted-average vesting period of 3.3 years. Of such amount, $799,439 represents unamortized compensation cost related to unvested stock option awards measured
using the intrinsic value method. Prior to the adoption of SFAS No. 123R, we presented such



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

Notes to Financial Statements(Continued)

(Unaudited)



unamortized compensation cost as deferred compensation and it was classified as a separate component of stockholders equity. In accordance with the
provisions of SFAS No. 123R, on January 1, 2006, we reclassified deferred compensation against additional paid-in capital.

6. Related Party
Transactions

Our board of directors approved an arrangement in September 2001 to engage Dr. Yuichi Iwaki, Executive Chairman of
the Board, as a consultant in connection with financing transactions and business development activities. In November 2003, we amended the arrangement and in November 2004, we further amended the arrangement pursuant to a consulting agreement dated
as of November 22, 2004. Pursuant to such arrangement we pay Dr. Iwaki $20,000 per month plus other cash or stock compensation, if any, as the board of directors deems appropriate for his services rendered. Compensation earned by
Dr. Iwaki during the three months ended March 31, 2006 and 2005 was $87,500 and $60,000, respectively. On July 19, 2005, the Board appointed Dr. Iwaki as our Executive Chairman and on September 30, 2005, the Board named him
as our Acting Chief Executive Officer and Chief Financial Officer. On March 15, 2006, Dr. Iwaki was appointed to the office of President and Chief Executive Officer.

7. Facility Lease

In 2004, we leased our corporate headquarters under a non-cancelable operating
lease that expires in February 2008. In March 2005, we amended our non-cancelable operating lease for our corporate headquarters to expand our leased space from 11,375 square feet to 16,609 square feet. We have the option to renew the lease for
three years. In June 2005, we leased office space in Japan under a non-cancelable operating lease that expires in May 2007. Rent expense for the three months ended March 31, 2006 and 2005 was $179,968 and $115,506, respectively.

In January 2006, we sub-leased 3,506 square feet of our corporate headquarters under a non-cancelable operating lease that expires in January 2008.
Expected sub-lease income for the years ending December 31, 2006, 2007 and 2008 will be $101,762, $113,594 and $9,466, respectively. During the first quarter of 2006 we recorded a $54,355 charge related to our expected loss on the sub-lease and
a $35,259 impairment charge for the tenant improvements included in the sub-leased space. Both charges are included in general and administrative expense on the accompanying statement of operations.

Future minimum payments (net of sub-lease income) are as follows:



|                                     |  |   |          
|------------------------------------ |  | - | ---------
|Nine months ending December 31, 2006 |  | $ | 473,941  
|Years ending December 31:            |  |   |          
|2007                                 |  |   | 587,349  
|2008                                 |  |   | 45,344   
|                                     |  |   |          
|                                     |  | $ | 1,106,634
|                                     |  |   |          

8. License Agreements

In March 2006, we terminated our license agreement with RIKEN. We have no further obligations under such agreement. As of March 31, 2006, future milestone payments under all of our license agreements totaled
approximately $79.9 million.



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##### Table of Contents

MEDICINOVA, INC.

(a development stage company)

Notes to Financial Statements(Continued)

(Unaudited)



9. Stockholders Equity

Stock Options

In January 2006, we granted options to each employee and each member of our
board of directors to purchase an aggregate of 2,716,000 shares of our common stock at a weighted average exercise price of 139 Japanese Yen (or approximately $1.18) per share, all of which were granted at fair market value on the date of grant.

A summary of the changes in options outstanding during the three months ended March 31, 2006 is as follows:



|                             |  |           |   |  |                               |     
|---------------------------- |  | --------- | - |  | ----------------------------- | ----
|                             |  | Options   |   |  | Weightedaverageexercise price
|Balance at December 31, 2005 |  | 4,724,167 |   |  | $                             | 2.21
|Granted                      |  | 2,716,000 |   |  | $                             | 1.18
|Exercised                    |  |          |   |  | $                             |    
|Cancelled                    |  | (35,459   | ) |  | $                             | 1.07
|                             |  |           |   |  |                               |     
|Balance at March 31, 2006    |  | 7,404,708 |   |  | $                             | 1.84
|                             |  |           |   |  |                               |     

Founders Warrants

In February 2006, one of our founders exercised warrants to purchase 659,848 shares of our common stock at $0.10 per share in a cashless exercise that
resulted in the issuance of 600,000 shares of common stock. In March 2006, our other founder exercised warrants to purchase 1,250,000 shares of our common stock at $0.10 per share for cash proceeds to us of $125,000. As of March 31, 2006, the number
of underlying common shares that could be purchased under the terms of the founders warrants was 10,946,724.

Treasury stock

In February and March 2006, we purchased an aggregate of 748,000 shares of our common stock at a weighted average price of 129
Japanese Yen (or approximately $1.10) per share pursuant to a publicly-announced stock repurchase plan.

10. Subsequent Events

In April 2006, a founder and a former officer exercised warrants to purchase 1,080,038 shares of our common stock at $0.10 per share in a cashless
exercise that resulted in the issuance of 1,000,000 shares of common stock.



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##### Table of Contents

ITEM 2. MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking
Statements May Prove Inaccurate

The following discussion and analysis should be read in conjunction with our financial statements
and notes thereto included in this report on Form 10-Q and the audited financial statements and notes thereto as of and for the year ended December 31, 2005 included in our Annual Report on Form 10-K filed with the Securities and Exchange
Commission on February 16, 2006. Operating results are not necessarily indicative of results that may occur in future periods.

This report includes forward-looking statements that are subject to risks and uncertainties, many of which are beyond our control. Our actual results will differ from those anticipated in these forward-looking statements as a result of
various factors, including those set forth below under the caption Risk Factors and the differences may be material. Forward-looking statements discuss matters that are not historical facts. Forward-looking statements include, but are
not limited to, discussions regarding our operating strategy, product development and growth strategy, acquisition strategy, cost savings initiatives, industry, economic conditions, financial condition, liquidity and capital resources and results of
operations. In this report, for example, we make forward-looking statements regarding our expectations about the rate of development expense growth and the reasons for that expected growth and our expected cash needs. Such statements include, but
are not limited to, statements preceded by, followed by or that otherwise include the words believes, expects, anticipates, intends, estimates, projects, can,
could, may, will, would or similar expressions. For those statements, we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act
of 1995. You should not rely unduly on these forward-looking statements, which speak only as of the date on which they were made. We undertake no obligation to update publicly or revise any forward-looking statements, whether as a result of new
information, future events or otherwise, unless required by law.

Overview and Recent Developments

We are a specialty pharmaceutical company focused on acquiring, developing and commercializing innovative pharmaceutical products for a variety of
diseases and conditions. While we seek to identify and acquire license rights to product candidates with extensive safety and efficacy data that are in late pre-clinical or early clinical development and that address large markets with significant
opportunities for improved therapies, we are focused primarily on the development of our existing programs at the present time and do not foresee material acquisitions of product candidates in the near term.

Our development programs consist of:



| |  |  | MN-001 for the treatment of bronchial asthma, for which we completed a Phase II clinical trial in the fourth quarter of 2005 in the United States;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | MN-029 for the treatment of solid tumors, for which we currently have two Phase I clinical trials ongoing in the United States;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------



| |  |  | MN-001 for the treatment of interstitial cystitis, for which we commenced a Phase II clinical trial in the second quarter of 2005 in the United States;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | MN-305 for the treatment of Generalized Anxiety Disorder, for which we commenced a Phase II clinical trial at the end of 2004 in the United States (in addition, our licensor of
MN-305 has completed an early Phase II clinical trial for anxiety disorders in Japan);
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | MN-166 for the treatment of multiple sclerosis, for which we commenced a Phase II clinical trial in the second quarter of 2005 in Eastern Europe;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------



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##### Table of Contents

| |  |  | MN-221 for the treatment of preterm labor, for which we commenced an additional Phase I clinical trial in the United States in the first half of 2005 and our licensor of this
candidate has completed an early Phase II clinical trial in the United Kingdom; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | MN-246 for the treatment of urinary incontinence, for which we commenced a Phase I clinical trial during the first quarter of 2006.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------

On February 4, 2005, we completed an initial public offering of 30.0 million shares of common stock for proceeds of $104.5 million, net of
underwriting discounts and commissions and offering expenses.

On March 8, 2005, we completed the sale of 1,573,000 shares of our
common stock for aggregate proceeds of $5.6 million, net of underwriting discounts and commissions. The sale of these shares was the result of the underwriters partial exercise of the over-allotment option we granted to them in connection with
our initial public offering.

We are a development stage company. We have incurred significant net losses since our inception. At
March 31, 2006, our accumulated deficit was approximately $128.9 million. We expect to incur substantial net losses for the next several years as we continue to develop our existing programs, and over the long term as we expand our research and
development programs and acquire or in-license products, technologies or businesses that are complementary to our own.

Revenues and Cost of Revenues

We have not generated any revenues from licensing, milestones or product sales to date, and we do not expect to generate any
revenues from the commercialization of our product candidates within the next 12 months. Our revenues to date have been generated from development management contracts with Asahi Kasei Pharma Corporation and Argenes, Inc. under which we bill
consulting fees and our pass-through clinical contract costs. The primary cost associated with our revenue is the clinical contract costs we incur and pass-through to our customer. We expect to generate revenue from the Argenes development
management contract for at least the next 12 months based on currently anticipated clinical trials.

Research and Development

Our research and development expenses primarily consist of costs associated with the feasibility studies, licensing and pre-clinical and clinical
development of our six licensed compounds, one of which we are developing for the treatment of two separate indications. These research and development expenses include external costs, such as fees paid to consultants and related contract research,
and internal costs of compensation and other expenses for research and development personnel, supplies, materials, facility costs and depreciation.

To the extent that costs, including personnel costs, are not tracked to a specific product development program, they are included in the Unallocated category in the table below. We charge all research and development expenses to
operations as incurred.



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##### Table of Contents

The following summarizes our research and development expenses for the periods indicated (in thousands):



|                               |  |                                    |       |                             |       |       |   |    
|------------------------------ |  | ---------------------------------- | ----- | --------------------------- | ----- | ----- | - | ---
|ProductCandidate               |  | Disease/ Indication                |       | Three months endedMarch 31,
|                               |  | 2006                               |       | 2005                       
|MN-001                         |  | Bronchial asthma                   |       | $                           | 715   |       | $ | 826
|MN-029                         |  | Solid tumor                        |       |                             | 668   |       |   | 546
|MN-001                         |  | Interstitial cystitis              |       |                             | 1,107 |       |   | 614
|MN-305                         |  | Generalized Anxiety Disorder       |       |                             | 2,405 |       |   | 873
|MN-166                         |  | Multiple Sclerosis                 |       |                             | 1,616 |       |   | 73 
|MN-221                         |  | Premature labor                    |       |                             | 213   |       |   | 459
|MN-246                         |  | Urinary incontinence; Pollakisuria |       |                             | 710   |       |   | 27 
|SOCC                           |  | Cancer; Inflammatory diseases      |       |                             | 25    |       |   | 15 
|Unallocated                    |  |                                    | 293   |                             |       | 697  
|                               |  |                                    |       |                             |       |       |   |    
|Total research and development |  | $                                  | 7,752 |                             | $     | 4,130
|                               |  |                                    |       |                             |       |       |   |    

While currently we are focused on advancing each of our product development programs, we
anticipate that we will make determinations as to which programs, if any, to pursue and how much funding to direct to each program on an ongoing basis in response to the scientific and clinical success of each product candidate, as well as an
ongoing assessment as to the product candidates commercial potential.

General and Administrative

Our general and administrative expenses primarily consist of salaries and benefits and consulting and professional fees related to our administrative,
finance, human resources, legal, and internal systems support functions. In addition, general and administrative expenses include insurance and facilities costs. Our general and administrative expenses for the quarter ended March 31, 2006
include lease exit costs of approximately $35,000 and impairment charges on capitalized tenant improvements of approximately $54,000, both of which are as a result of our decision, in January 2006, to sub-lease a portion of our corporate
headquarters.

Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with accounting principles generally accepted in the
United States. The preparation of the financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses and the related disclosure of contingent assets and liabilities. We
review our estimates on an on-going basis, including those related to our significant accruals. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, the results of
which form the bases for making judgments about the carrying values of assets and liabilities. Actual results may differ from these estimates under different assumptions or conditions. Our accounting policies are described in more detail in Note 1
to our financial statements included in our Annual Report on Form 10-K. Our critical accounting policies and estimates are the same as those noted in our Form 10-K with the exception of our adoption of Statement of Financial Accounting Standards
(SFAS) No. 123R, Share-Based Payment as discussed below.

Share-Based Payments

We grant stock options to purchase our common stock to our employees and directors under our 2004 Stock Incentive Plan. Additionally, we have outstanding
options that were granted under the 2000 General Stock Incentive Plan from which we no longer make grants. The benefits provided under all of these plans are subject to the provisions of SFAS No. 123R, which we adopted effective January 1,
2006. We elected to use the modified prospective application in adopting SFAS No. 123R and therefore have not restated results for prior



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##### Table of Contents

periods. The valuation provisions of SFAS No. 123R apply to new awards and to awards that are outstanding on the adoption date and subsequently modified or
cancelled. Our results of operations for the first quarter of 2006 were impacted by the recognition of non-cash expense related to the fair value of our stock-based compensation awards. Stock-based compensation expense recognized under SFAS No. 123R
for the three months ended March 31, 2006 was $0.6 million.

The valuation provisions of SFAS No. 123R require us to estimate
certain variables such as estimated volatility, which if they change, could have a significant impact on the stock-based compensation amount we recognize.

Results of Operations

Comparison of the Three Months Ended March 31, 2006 and 2005

Revenues

Our revenue increased to
$192,000 for the three months ended March 31, 2006 from $2,000 for the three months ended March 31, 2005. The increase was due to increased activity under the Argenes master services agreement.

Research and Development

Research
and development expenses increased to $7.8 million for the three months ended March 31, 2006 from $4.1 million for the three months ended March 31, 2005. This increase primarily was due to:



| |  |  | an increase of $4.1 million in clinical trial and related costs; and
| | - |  | --------------------------------------------------------------------



| |  |  | a decrease of $0.4 million in unallocated expenses.
| | - |  | ---------------------------------------------------

We expect that fees
paid to external service providers will continue to increase as we continue development of our existing product candidates. We anticipate that our research and development expenses will continue to increase in future periods as we expend additional
capital to conduct clinical trials and develop our product candidates.

General and Administrative

General and administrative expenses increased to $2.2 million for the three months ended March 31, 2006 from $1.4 million for the three months ended
March 31, 2005. This increase was primarily was due to:



| |  |  | an increase of $0.5 million of employee stock-based compensation as results of additional grant of options to purchase our common stock to our employees and directors under our
stock option plans and adoption of the provisions of SFAS No. 123R;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | an increase of $0.1 million of impairment loss from sub-lease of a portion of our corporate headquarters;
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | an increase of $0.1 million of various legal, accounting consulting fees and other consulting related expenses; and
| | - |  | -------------------------------------------------------------------------------------------------------------------



| |  |  | an increase of $0.1 million of other expenses.
| | - |  | ----------------------------------------------



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##### Table of Contents

We anticipate increases in general and administrative expenses in future periods as we expand our
administrative organization and incur additional costs for insurance, professional and consulting fees associated with operating as a public company and to support the future growth of our research and development programs.

Interest Income

Interest income
primarily consists of income earned on our cash and investment balances and totaled $1.4 million and $0.7 million for the three months ended March 31, 2006 and 2005, respectively. The increase was primarily due to the increase in our average
cash and investment balances as a result of the proceeds from our IPO.

Liquidity and Capital Resources

Since our inception, our operations have been financed through the private placement of our equity securities and through the public sale of our common
stock in our IPO. Through March 31, 2006, we received estimated net proceeds of $190.2 million from the sale of equity securities as follows:



| |  |  | in September 2000, we issued and sold 500,000 shares of common stock to founders for aggregate proceeds of $0.1 million;
| | - |  | ------------------------------------------------------------------------------------------------------------------------



| |  |  | in October 2000 and August 2001, we issued and sold a total of 1,000,000 shares of Series A preferred stock for aggregate net proceeds of $10.0 million;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | from March 2003 through May 2004, we issued and sold 291,150 shares of Series B preferred stock for aggregate net proceeds of $26.8 million;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | on September 2, 2004, we issued and sold 27,667,856 shares of Series C preferred stock for aggregate net proceeds of $43.4 million;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------



| |  |  | on February 4, 2005, we completed an initial public offering of 30.0 million shares of common stock for proceeds of $104.2 million, net of underwriting discounts and
commissions and offering expenses (including issuance costs for registration statements filed on behalf of restricted stockholders through December 2005);
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | on March 8, 2005, we completed the sale of 1,573,000 shares of our common stock for aggregate proceeds of $5.6 million, net of underwriting discounts and commissions. The sale
of these shares was the result of the underwriters partial exercise of the over-allotment option we granted to them in connection with our IPO; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | on March 2, 2006, we issued and sold 1,250,000 shares of common stock to a founder in exercise of warrants for aggregate proceeds of $0.1 million.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------

As of March 31, 2006, we had $20 million in cash and cash equivalents as compared to $37.7 million as of December 31, 2005, a decrease of $17.7
million. Net cash used in operating activities amounted to $6.8 million for the three months ended March 31, 2006, primarily due to the net loss occurring for this period of $8.4 million. Net cash used in investing activities for the three
months ended March 31, 2006 primarily consisted of $10.2 million for the net purchases of investments. Net cash used in financing activities amounted to $0.7 million for the three months ended March 31, 2006, primarily due to the
repurchase of outstanding stock pursuant to a publicly-announced repurchase program.

We believe our existing cash, cash equivalents and
investments as of March 31, 2006 will be sufficient to meet our projected operating requirements through at least December 31, 2006.



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##### Table of Contents

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our exposure to market risk due to
changes in interest rates is primarily due to the increase or decrease in the amount of interest income we can earn on our investment portfolio. Our risk associated with fluctuating interest rates is limited to our investments in interest-rate
sensitive financial instruments. Under our current policies, we do not use interest rate derivative instruments to manage exposure to interest rate changes. We attempt to increase the safety and preservation of our invested principal funds by
limiting default risk, market risk and reinvestment risk. We mitigate default risk by investing in investment grade securities. A hypothetical 100 basis point adverse move in interest rates along the entire interest rate yield curve would not
materially affect the fair value of our interest sensitive financial instruments. Changes in interest rates over time will increase or decrease our interest income.

ITEM 4. CONTROLS AND PROCEDURES

We maintain disclosure controls and procedures that are designed to ensure
that information required to be disclosed in our reports pursuant to the Securities Exchange Act of 1934 (the Exchange Act), is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange
Commissions rules and forms and that such information is accumulated and communicated to our management, including our chief executive officer and principal financial officer, as appropriate, to allow for timely decisions regarding required
disclosure. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control
objectives, and management is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

As required by Rule 13a-15(b) of the Exchange Act, we carried out an evaluation, under the supervision and with the participation of our management, including our chief executive officer and our principal financial officer, of the
effectiveness of the design and operation of our disclosure controls and procedures as of the end of the quarter covered by this report. Based on the foregoing, our chief executive officer and our principal financial officer concluded that our
disclosure controls and procedures were effective at the reasonable assurance level.

There has been no change in our internal controls
over financial reporting during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.



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##### Table of Contents

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS.

None.

ITEM 1A. RISK FACTORS.

We operate in a dynamic and rapidly changing environment that involves numerous
risks and uncertainties. The following section describes some, but not all, of the risks and uncertainties that may have a material adverse effect on our business, financial condition, results of operations and the market price of our common stock
and could cause our actual results to differ materially from those expressed or implied in our forward-looking statements.

Risks Related to Our
Business

We expect our net losses to continue for at least several years and we are unable to predict the extent of our future losses.

We are a development stage specialty pharmaceutical company with a limited operating history. We have incurred significant net
losses since our inception. For the three months ended March 31, 2006, we had a net loss of $8.4 million. For the year ended December 31, 2005, we had a net loss of $25.7 million. Our annual net losses may increase over the next several
years as we expand and incur significant clinical development costs.

We expect our development expenses to increase in connection with our
planned clinical trials for our product candidates and any other development projects that we may initiate. In addition, we expect to incur increased general and administrative expenses as well as the increased costs to operate as a public company.
Consequently, we expect to continue to incur significant and increasing operating losses for the foreseeable future.

We do not have any products
that are approved for commercial sale and therefore do not expect to generate any revenues from product sales in the foreseeable future.

We have not received, and do not expect to receive for at least the next several years, any revenues from the commercialization of our product candidates. To date, we have not generated any product revenues and have funded our operations
primarily from sales of our securities. Our only source of revenues since inception has been from development management services rendered to Asahi Kasei Pharma Corporation and Argenes, Inc., both Japanese pharmaceutical companies, in connection
with their clinical development of pharmaceutical product candidates. Our contract with Asahi Kasei Pharma has been completed and we do not expect to generate further revenues from that agreement. We anticipate that we will continue to receive
modest revenues for rendering consulting services and that, prior to our commercialization of a product candidate, our consulting revenues, together with out-licensing upfront and milestone payments, will be our primary source of revenues. To obtain
revenues from sales of our product candidates, we must succeed, either alone or with third parties, in developing, obtaining regulatory approval for, manufacturing and marketing drugs with market potential. We may never succeed in these activities,
and may not generate sufficient revenues to continue our business operations or achieve profitability.

The loss of any rights to develop and market
any of our product candidates could significantly harm our business.

We license the rights to develop and market our product
candidates. Currently, we have licensed six compounds for the development of seven product candidates. They are:



| |  |  | MN-001 for interstitial cystitis and asthma licensed from Kyorin Pharmaceutical;
| | - |  | --------------------------------------------------------------------------------



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| |  |  | MN-029 for solid tumors licensed from Angiogene Pharmaceuticals;
| | - |  | ----------------------------------------------------------------



| |  |  | MN-305 for Generalized Anxiety Disorder licensed from Mitsubishi Pharma Corporation;
| | - |  | ------------------------------------------------------------------------------------



| |  |  | MN-166 for multiple sclerosis licensed from Kyorin Pharmaceutical;
| | - |  | ------------------------------------------------------------------



| |  |  | MN-221 for preterm labor licensed from Kissei Pharmaceutical; and
| | - |  | -----------------------------------------------------------------



| |  |  | MN-246 for urinary incontinence licensed from Mitsubishi Pharma Corporation.
| | - |  | ----------------------------------------------------------------------------

We are obligated to develop and commercialize these product candidates in accordance with mutually agreed upon terms and conditions. Our ability to satisfy some or all of the terms and conditions of our licensing
arrangements is dependent on numerous factors, including some factors that are outside of our control. Our licensing arrangements may be terminated if we breach our obligations under the agreements materially and fail to cure a breach within a
specified period of time.

If any of our license agreements is terminated, we would have no further rights to develop and commercialize the
product candidate that is the subject of the license. The termination of any of our license agreements would significantly and adversely affect our business.

In order to commercialize a therapeutic drug successfully, a product candidate must undergo clinical trials, which are long, complex and costly, manifest a high risk of failure and can be delayed or suspended.

All seven product candidates are in clinical development, the process that is required to receive regulatory approval for commercial sale. The regulatory
approval process is long, complex and costly. It may take several years to complete the clinical development necessary to commercialize a drug, and delays or failure can occur at any stage, which may result in our inability to market and sell
products derived from our product candidates and to generate product revenues. Of the large number of drugs in development, only a small percentage result in the submission of a New Drug Application, or NDA, to the Food and Drug Administration, or
FDA, and even fewer are approved for commercialization. Interim results of clinical trials do not necessarily predict final results, and success in pre-clinical testing and early clinical trials does not ensure that later clinical trials will be
successful. A number of companies in the pharmaceutical industry have suffered significant setbacks in advanced clinical trials even after promising results in earlier trials.

In connection with clinical trials, we face risks that:



| |  |  | a product candidate may not prove to be efficacious;
| | - |  | ----------------------------------------------------



| |  |  | patients may die or suffer other adverse effects for reasons that may or may not be related to the product candidate being tested;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------



| |  |  | the results may not confirm the positive results of earlier trials; and
| | - |  | -----------------------------------------------------------------------



| |  |  | the results may not be acceptable to the FDA or other regulatory agencies.
| | - |  | --------------------------------------------------------------------------

To date, we have regulatory approval to conduct clinical trials for all seven product development programs. Investigational New Drug, or IND, applications were approved and are active for six product candidates. We
have Clinical Trial Authorizations, or CTAs, the equivalent of a U.S. IND, approved and active to conduct a Phase II study for MN-166 in patients with multiple sclerosis in five countries in Eastern Europe.

The commencement of clinical trials can be delayed for a variety of other reasons, including delays in:



| |  |  | demonstrating sufficient safety to persuade regulatory authorities to allow a clinical trial to begin;
| | - |  | ------------------------------------------------------------------------------------------------------



| |  |  | reaching agreement on acceptable terms with prospective contract research organizations and clinical trial sites;
| | - |  | -----------------------------------------------------------------------------------------------------------------



| |  |  | manufacturing sufficient quantities of a product candidate;
| | - |  | -----------------------------------------------------------



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| |  |  | obtaining institutional review board approval to conduct a clinical trial at a prospective site; and
| | - |  | ----------------------------------------------------------------------------------------------------



| |  |  | obtaining sufficient patient enrollment, which is a function of many factors, including the size of the patient population, the nature of the protocol, the proximity of patients to
clinical sites, the availability of effective treatments for the relevant disease and the eligibility criteria for the clinical trial.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Once a clinical trial has begun, it may be delayed, suspended or terminated due to a number of factors, including:



| |  |  | ongoing discussions with regulatory authorities regarding the scope or design of our clinical trials or requests by them for supplemental information with respect to our clinical
trial results;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our failure or inability to conduct clinical trials in accordance with regulatory requirements;
| | - |  | -----------------------------------------------------------------------------------------------



| |  |  | lower than anticipated retention rates of patients in clinical trials;
| | - |  | ----------------------------------------------------------------------



| |  |  | serious adverse events or side effects experienced by participants; or
| | - |  | ----------------------------------------------------------------------



| |  |  | insufficient supply or deficient quality of product candidates or other materials necessary for the conduct of our clinical trials.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------

Many of these factors described above may also ultimately lead to denial of regulatory approval of a current or potential product candidate. If we
experience delays in our clinical trials, the commercial prospects for our product candidates will be harmed, and our ability to generate product revenues will be delayed.

If we fail to identify and license or acquire other product candidates, we will not be able to expand our business over the long term.

Given that we have limited internal discovery capabilities, our business over the long term is substantially dependent on our ability to license or
acquire clinical-stage product candidates and further develop them for commercialization. The success of this strategy depends upon our ability to identify, select and acquire the right product candidates. We have limited experience identifying,
negotiating and implementing economically viable product candidate acquisitions or licenses, which is a lengthy and complex process. Also, the market for licensing and acquiring product candidates is intensely competitive and many of our competitors
have greater resources than us. We may not have the requisite capital resources to consummate product candidate acquisitions or licenses that we identify to fulfill our strategy.

Moreover, product candidate acquisitions that we do complete involve numerous risks, including:



| |  |  | difficulties in integrating the development program for the acquired product candidate into our existing operations;
| | - |  | --------------------------------------------------------------------------------------------------------------------



| |  |  | diversion of financial and management resources from existing operations;
| | - |  | -------------------------------------------------------------------------



| |  |  | risks of entering new markets or technologies;
| | - |  | ----------------------------------------------



| |  |  | inability to generate sufficient revenues to offset acquisition costs; and
| | - |  | --------------------------------------------------------------------------



| |  |  | delays that may result from us having to perform unanticipated pre-clinical trials or other tests on the product candidate.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------

For these and other reasons, we have determined to place less emphasis on efforts to identify and acquire additional product candidates in the near term.
If we are not successful in identifying and licensing or acquiring other product candidates over the long term, we will not be able to grow our revenues with sales from new products beyond those revenues, if any, from our existing product
candidates.



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If we fail to obtain the capital necessary to fund our operations, we will be unable to develop and commercialize
our product candidates.

We have consumed substantial amounts of capital since our inception. From our inception to March 31,
2006, we have an accumulated deficit of $128.9 million. Although we believe our existing cash and investments will be sufficient to fund our anticipated cash requirements at least through December 31, 2006, we will require significant
additional financing in the future to fund our operations thereafter. Our future capital requirements will depend on, and could increase significantly as a result of many factors including:



| |  |  | progress in, and the costs of, our clinical trials;
| | - |  | ---------------------------------------------------



| |  |  | the costs of securing manufacturing arrangements for clinical or commercial production;
| | - |  | ---------------------------------------------------------------------------------------



| |  |  | the costs involved in filing, prosecuting, enforcing and defending patent claims and other intellectual property rights; and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------



| |  |  | the costs of establishing or contracting for sales and marketing capabilities if we obtain regulatory approval to market our product candidates.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------

Until we can generate significant continuing revenues, we expect to satisfy our future cash needs through strategic collaborations, private or public
sales of our securities, debt financings or by licensing all or a portion of our product candidates, to the extent we are able to do so. We cannot be certain that additional sources of capital will be available to us on acceptable terms, or at all.
If sources of capital are not available, we may not be in a position to pursue other business opportunities that require financial commitments and we may be required to:



| |  |  | terminate or delay clinical trials for one or more of our product candidates;
| | - |  | -----------------------------------------------------------------------------



| |  |  | delay establishing sales and marketing capabilities;
| | - |  | ----------------------------------------------------



| |  |  | curtail our efforts to acquire new product candidates; or
| | - |  | ---------------------------------------------------------



| |  |  | relinquish rights to our technologies or product candidates.
| | - |  | ------------------------------------------------------------

The
terms under which we raise additional capital may harm our business and may significantly dilute stockholders ownership interests.

If we raise additional funds through collaborations or licensing arrangements with third parties, we may need to relinquish some rights to our product candidates, including commercialization rights, that may harm our ability to grow our
business. If we raise additional funds by issuing equity securities, stockholders may experience substantial dilution. Debt financing, if available, may involve restrictive covenants that may impede our ability to operate our business. Any debt
financing or additional equity that we raise may contain terms that are not favorable to us or our stockholders.

We will depend on strategic
collaborations with third parties to develop and commercialize selected product candidates and will not have control over a number of key elements relating to the development and commercialization of these product candidates.

A key aspect of our strategy is to enter into collaborations with third-party partners whereby we license selected product candidates to larger
pharmaceutical companies that are willing to conduct later-stage clinical trials and further develop and commercialize those products. To date, we have not entered into any collaborative arrangements with any third-party partners.

By entering into these strategic collaborations, we may rely on our partners for financial resources and for development, commercialization and
regulatory expertise. Our partners may fail to develop or effectively commercialize products using our product candidates because they:



| |  |  | do not have sufficient resources or decide not to devote the necessary resources due to internal constraints such as limited cash or human resources;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | decide to pursue a competitive potential product that has been developed outside of the collaboration; or
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | cannot obtain the necessary regulatory approvals.
| | - |  | -------------------------------------------------

We may
not be able to enter into collaborations on acceptable terms, if at all. We also face competition in our search for partners with whom we may collaborate.

We rely on third parties to conduct our clinical trials and perform data collection and analysis, which may result in costs and delays that may hamper our ability to successfully develop and commercialize our product candidates.

Although we design and manage our current clinical trials, we do not have the ability to conduct clinical trials directly for our
product candidates. We will rely on contract research organizations, medical institutions, clinical investigators and contract laboratories to conduct our clinical trials and to perform data collection and analysis. In the course of clinical
development, we have contracted and will continue to contract with a number of these research organizations, including, without limitation: Accelsiors CRO and Consultancy Services of Budapest, Hungary; Pharmaceutical Research Associates, Inc. of
Lenexa, Kansas; Fulcrum Pharma Developments, Inc. of Durham, North Carolina; Paragon, Inc. of Irvine, California; Quintiles, Inc. of Morrisville, North Carolina and SFBC International of Princeton, New Jersey.

Our clinical trials may be delayed, suspended or terminated if:



| |  |  | the third parties upon whom we rely do not successfully carry out their contractual duties or regulatory obligations or meet expected deadlines;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | such third parties need to be replaced; or
| | - |  | ------------------------------------------



| |  |  | the quality or accuracy of the data obtained by the third parties is compromised due to their failure to adhere to our clinical protocols or regulatory requirements or for other
reasons.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Failure to perform by the third parties upon whom we rely may increase our development costs, delay our ability to
obtain regulatory approval and prevent the commercialization of our product candidates. While we believe that there are numerous alternative sources to provide these services, if we were to seek such alternative sources, we might not be able to
enter into replacement arrangements without delays or additional expenditures.

Our product candidates, if approved for sale, may not gain acceptance
among physicians, patients and the medical community, thereby limiting our potential to generate revenues.

Even if our product
candidates are approved for commercial sale by the FDA or other regulatory authorities, the degree of market acceptance of any approved product candidate by physicians, healthcare professionals and third-party payors, and our profitability and
growth will depend on a number of factors, including:



| |  |  | relative convenience and ease of administration;
| | - |  | ------------------------------------------------



| |  |  | the prevalence and severity of any adverse side effects;
| | - |  | --------------------------------------------------------



| |  |  | availability of alternative treatments;
| | - |  | ---------------------------------------



| |  |  | pricing and cost effectiveness, which may be subject to regulatory control;
| | - |  | ---------------------------------------------------------------------------



| |  |  | effectiveness of our or any of our partners sales and marketing strategy; and
| | - |  | ------------------------------------------------------------------------------



| |  |  | our ability to obtain sufficient third-party insurance coverage or reimbursement.
| | - |  | ---------------------------------------------------------------------------------

If any product candidate that we develop does not provide a treatment regimen that is as beneficial as the current standard of care or otherwise does not provide patient benefit, that product likely will not achieve
market acceptance.



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We are dependent on our management team, particularly Yuichi Iwaki, M.D., Ph.D., and if we are unable to attract,
retain and motivate Dr. Iwaki and other key management and scientific staff, our drug development programs may be delayed and we may be unable to develop successfully or commercialize our product candidates.

We are dependent upon the continued services of our executive officers and other key personnel, particularly Yuichi Iwaki, M.D., Ph.D., one of our
founders and the Executive Chairman of our Board of Directors and our President and Chief Executive Officer and Acting Chief Financial Officer, who has been instrumental in our ability to in-license product candidates from Japanese pharmaceutical
companies and secure financing from Japanese institutions. The relationships that all of our key managers have cultivated with pharmaceutical companies from whom we license product candidates and to whom we expect to out-license product candidates
make us particularly dependent upon their continued employment with us. We are also substantially dependent on the continued services of our existing project management personnel because of the highly technical nature of our product development
programs.

If and when we acquire or license new product candidates, our success will depend on our ability to attract, retain and motivate
highly qualified management and scientific personnel to manage the development of these new product candidates. In particular, our drug development programs depend on our ability to attract and retain highly experienced development and regulatory
personnel. In addition, we will need to hire additional personnel as we continue to expand our clinical development and other development activities. We face competition for experienced scientists and other technical and professional personnel from
numerous companies and academic and other research institutions. Competition for qualified personnel is particularly intense in the San Diego, California area, where our offices are located. Our short operating history and the uncertainties
attendant to being a development-stage specialty pharmaceutical company with limited capital resources could impair our ability to attract and retain personnel and impede the achievement of our development and commercialization objectives.

Although we have employment agreements with key members of management, each of our employees, subject to applicable notice requirements,
may terminate his or her employment at any time. We do not carry key person insurance covering members of senior management. If we lose any of our key management personnel, we may not be able to find suitable replacements and our
business would be harmed as a result.

If we are unable to establish our sales and distribution capabilities, we will be unable to successfully
commercialize our product candidates.

To date, we have not sold, marketed or distributed any pharmaceutical products. If we are
successful in developing and obtaining regulatory approvals for the product candidates in our programs or acquire other products, we will need to establish sales, marketing and distribution capabilities. Developing an effective sales and marketing
force will require a significant amount of our financial resources and time. We may be unable to establish and manage an effective sales force in a timely or cost-effective manner, if at all, and any sales force we do establish may not be capable of
generating demand for our products. Although we intend to establish strategic collaborations to market the products in our programs outside the United States, if we are unable to establish such collaborations, we may be required to market our
product candidates outside of the United States directly. In that event, we may need to build a corresponding international sales and marketing capability with technical expertise and with supporting distribution capabilities.

We will need to increase the size of our organization, and we may encounter difficulties managing our growth, which could adversely affect our results of
operations.

We will need to expand and effectively manage our operations and facilities in order to advance our drug development
programs, achieve milestones under our collaboration agreements, facilitate additional collaborations and pursue other development activities. For example, we intend to hire additional personnel in clinical development, regulatory affairs and
corporate development to further strengthen our core competencies.



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Similarly, we are likely to hire additional management and administrative personnel to manage our
business and affairs as we continue to grow. In addition, we will have to develop sales, marketing and distribution capabilities for the product candidates in our programs. The scope and timing of these hires is highly uncertain and remains subject
to the success of our current product candidate development programs.

To manage our growth, we will be required to continue to improve our
operational, financial and management controls, reporting systems and procedures and to attract and retain sufficient numbers of talented employees. Meeting our public reporting obligations and other regulatory requirements in the United States and
Japan places additional demands on our limited resources. We may not successfully manage the expansion of our operations and, accordingly, may not achieve our development and commercialization goals.

We expect that our results of operations will fluctuate, which may make it difficult to predict our future performance from period to period.

Our quarterly operating results have fluctuated in the past and are likely to continue to do so in the future. Some of the factors that could cause our
operating results to fluctuate from period to period include:



| |  |  | the status of development of our product candidates and, particularly, the timing of any milestone payments to be paid or received by us under our licensing agreements;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the incurrence of clinical expenses that could fluctuate significantly from period to period;
| | - |  | ---------------------------------------------------------------------------------------------



| |  |  | the unpredictable effects of collaborations during these periods;
| | - |  | -----------------------------------------------------------------



| |  |  | the timing of our satisfaction of applicable regulatory requirements, if at all;
| | - |  | --------------------------------------------------------------------------------



| |  |  | the rate of expansion of our clinical development and other internal development efforts;
| | - |  | -----------------------------------------------------------------------------------------



| |  |  | the effect of competing technologies and products and market developments; and
| | - |  | ------------------------------------------------------------------------------



| |  |  | general and industry-specific economic conditions.
| | - |  | --------------------------------------------------

We
believe that quarterly or yearly comparisons of our financial results are not necessarily meaningful and should not be relied upon as an indication of our future performance.

Relying on third-party manufacturers may result in delays in our clinical trials and product introductions as well as increased costs.

We have no manufacturing facilities, and we do not intend to develop facilities for the manufacture of product candidates for clinical trials or
commercial purposes in the foreseeable future. We are contracting with third-party manufacturers to produce, in collaboration with us, sufficient quantities of our product candidates for clinical trials. While we believe that there are competitive
sources available to manufacture our product candidates, we may not be able to enter into arrangements without delays or additional expenditures. We cannot estimate these delays or costs with certainty. To date, these manufacturers have met the
requirements of our programs; however, we have only required the manufacture of our product candidates in very limited volume because we do not have any commercialized product.

Our manufacturers will be obliged to operate in accordance with FDA-mandated or International Convention on Harmonization (ICH) current good
manufacturing practices, or cGMPs. A failure of any of our contract manufacturers to establish and follow cGMPs and to document their adherence to such practices may lead to significant delays in clinical trials, or in obtaining regulatory approval
of product candidates or the ultimate launch of our products into the market. In addition, changing contract manufacturers is difficult. For example, doing so requires re-validation of the manufacturing processes and procedures in accordance with
cGMPs, which may be costly and time-consuming. Failure by our third-party manufacturers or us to comply with applicable regulations could result in sanctions being imposed on us, including fines, injunctions, civil penalties, failure of the
government to grant pre-market approval of drugs, delays, suspension or withdrawal of approvals, seizures or recalls of products, operating restrictions and criminal prosecutions.



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We may not be able to manufacture our product candidates in commercial quantities, which would prevent us from
commercializing our product candidates.

To date, our product candidates have been manufactured in small quantities for pre-clinical
and clinical trials. If any of these product candidates are approved by the FDA or other regulatory agencies for commercial sale, we will need to manufacture them in larger quantities. We may not be able to increase successfully the manufacturing
capacity, whether in collaboration with third-party manufacturers or on our own, for any of our product candidates in a timely or economic manner, or at all. Significant scale-up of manufacturing may require additional validation studies, which the
FDA must review and approve. If we are unable to increase successfully the manufacturing capacity for a product candidate, the regulatory approval or commercial launch of that product candidate may be delayed or there may be a shortage in supply.
Our product candidates will require precise, high quality manufacturing. Our failure to achieve and maintain these high manufacturing standards, including the incidence of manufacturing errors, could result in patient injury or death, product
recalls or withdrawals, delays or failures in product testing or delivery, cost overruns or other problems that could harm our business, financial condition and results of operations.

Materials necessary to manufacture our products may not be available on commercially reasonable terms, or at all, which may delay the development and commercialization of our products.

We rely on the manufacturers for our products to purchase from third-party suppliers the materials necessary to produce the compounds for our clinical
trials and for commercial distribution, if we obtain marketing approval for any of our products. Suppliers may not sell these materials to our manufacturers at the time we need them or on commercially reasonable terms. We do not have any control
over the process or timing of the acquisition of these materials by our manufacturers. Moreover, we currently do not have any agreements for the production of these materials. If our manufacturers are unable to obtain these materials for our
clinical trials, product testing and potential regulatory approval of our products would be delayed, significantly impacting our ability to develop the product candidate. If our manufacturers or we are unable to purchase these materials after
regulatory approval has been obtained for our products, the commercial launch of our products would be delayed or there would be a shortage in supply of our products, which would harm our ability to generate revenues from the sale of our products.

Risks Related to Our Intellectual Property

Our
ability to compete may decline if we do not adequately protect our proprietary rights.

To date, we have obtained licensed rights to
ten issued U.S. patents and two U.S. patent applications. We also have obtained licensed rights to 64 issued and pending foreign patents corresponding to these U.S. patents. The patents to which we have licensed rights are set to expire between 2009
and 2020. In addition to these licensed rights, we hold three U.S. patent applications relating to MN-001 and its metabolite, MN-002, as well as one U.S. patent application relating to MN-029. These patents and pending patent applications contain
claims directed to, among other things, compounds, compositions, methods of use and/or methods of manufacture.

The patent protection of
our product candidates and technology involves complex legal and factual questions. In general, our license agreements give us a right, but not an obligation, to enforce our patent rights. We cannot be certain that any of the patents or patent
applications owned by us or our licensors related to our product candidates and technology will provide adequate protection from competing products. Our success will depend, in part, on whether we or our licensors can:



| |  |  | obtain and maintain patents to protect our product candidates;
| | - |  | --------------------------------------------------------------



| |  |  | obtain and maintain any required or desirable licenses to use certain technologies of third parties, which may be protected by patents;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------



| |  |  | protect our trade secrets and know-how;
| | - |  | ---------------------------------------



| |  |  | operate without infringing the intellectual property and proprietary rights of others;
| | - |  | --------------------------------------------------------------------------------------



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| |  |  | enforce the issued patents under which we hold rights; and
| | - |  | ----------------------------------------------------------



| |  |  | develop additional proprietary technologies that are patentable.
| | - |  | ----------------------------------------------------------------

The degree of future protection for our proprietary rights is uncertain. For example:



| |  |  | we might not have been the first to make the inventions covered by each of our pending patent applications;
| | - |  | -----------------------------------------------------------------------------------------------------------



| |  |  | we might not have been the first to file patent applications for these inventions;
| | - |  | ----------------------------------------------------------------------------------



| |  |  | others may independently develop similar or alternative technologies or duplicate any of our technologies;
| | - |  | ----------------------------------------------------------------------------------------------------------



| |  |  | it is possible that none of our pending patent applications will result in issued patents;
| | - |  | ------------------------------------------------------------------------------------------



| |  |  | any patents under which we hold rights may not provide us with a basis for commercially viable products, may not provide us with any competitive advantages or may be challenged by
third parties as invalid, or unenforceable under U.S. or foreign laws;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | any of the issued patents under which we hold rights may not be valid or enforceable or may be circumvented successfully; or
| | - |  | ----------------------------------------------------------------------------------------------------------------------------



| |  |  | we may not develop additional proprietary technologies that are patentable.
| | - |  | ---------------------------------------------------------------------------

Proprietary trade secrets and unpatented know-how may also prove to be very important to our future research and development activities. However, we cannot be certain that others will not develop the same or similar
technologies on their own. We have taken steps, including entering into confidentiality agreements with all of our employees, consultants, outside scientific collaborators, sponsored researchers and other advisors, to protect our trade secrets and
unpatented know-how. We also typically obtain agreements from these parties which provide that inventions conceived by the party in the course of rendering services to us will be our exclusive property. However, these agreements may not be honored
and may not effectively assign intellectual property rights to us. Enforcing a claim that a party illegally obtained and is using our trade secrets or know-how is difficult, expensive and time consuming and the outcome is unpredictable. In addition,
courts outside the United States may be less willing to protect trade secrets or know-how.

A dispute concerning the infringement or misappropriation
of our proprietary rights or the proprietary rights of others could be time consuming and costly, and an unfavorable outcome could harm our business.

There is significant litigation in our industry regarding patent and other intellectual property rights. While we are not currently subject to any pending litigation, and are not aware of any threatened litigation, we
may be exposed to future litigation by third parties based on claims that our product candidates, technologies or activities infringe the intellectual property rights of others. There are many patents relating to chemical compounds and the uses
thereof. If our compounds are found to infringe any such patents, we may have to pay significant damages. A patent holder could prevent us from importing, making, using or selling the patented compounds. We may need to resort to litigation to
determine the scope and validity of third-party proprietary rights. Similarly, we may be subject to claims that we have inappropriately used or disclosed trade secrets or other proprietary information of third parties. If we become involved in
litigation, it could consume a substantial portion of our managerial and financial resources, regardless of whether we win or lose. We may not be able to afford the costs of litigation. Any legal action against us or our collaborators could lead to:



| |  |  | payment of damages, potentially treble damages, if we are found to have willfully infringed a third partys patent rights;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | injunctive or other equitable relief that may effectively block our ability to further develop, commercialize and sell our products;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | we or our collaborators having to enter into license arrangements that may not be available on commercially acceptable terms; or
| | - |  | --------------------------------------------------------------------------------------------------------------------------------



| |  |  | significant cost and expenses, as well as distraction of our management from our business.
| | - |  | ------------------------------------------------------------------------------------------

As a result, we could be prevented from commercializing current or future products.

Risks Related to Our Industry

We are subject to stringent regulation of our product candidates, which could
delay the development and commercialization of our products.

We, our third-party manufacturers, contractors, suppliers, partners,
and our product candidates are subject to stringent regulation by the FDA and other regulatory agencies in the United States and by comparable authorities in other countries. None of our product candidates can be marketed in the United States until
approved by the FDA. None of our product candidates has been approved, and we may never receive FDA approval for any of our product candidates. Obtaining FDA approval typically takes many years and requires substantial resources. Even if regulatory
approval is obtained, the FDA may impose significant restrictions on the indicated uses, conditions for use and labeling of such products. Additionally, the FDA may require post-approval studies, including additional research and development and
clinical trials. These regulatory requirements may limit the size of the market for the product or result in the incurrence of additional costs. Any delay or failure in obtaining required approvals could have a material adverse effect on our ability
to generate revenues from the particular product candidate.

In addition, both before and after regulatory approval, we, our partners, and
our product candidates are subject to numerous FDA requirements covering, among other things, testing, manufacturing, quality control, labeling, advertising, promotion, distribution and export. The FDAs requirements may change and additional
government regulations may be promulgated that could affect us, our partners, and our product candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action,
either in the United States or abroad.

In order to market our products outside of the United States, we and our strategic partners and
licensees must establish and comply with numerous and varying regulatory requirements of other countries regarding safety and efficacy. Approval procedures vary among countries and can involve additional product testing and additional administrative
review periods. The time required to obtain approval in other countries might differ from that required to obtain FDA approval. The regulatory approval process in other countries may include all of the risks detailed above regarding FDA approval in
the United States. Regulatory approval in one country does not ensure regulatory approval in another, but a failure or delay in obtaining regulatory approval in one country may negatively impact the regulatory process in others. Our product
candidate may not be approved for all indications that we request, which would limit the uses of our product and adversely impact our potential royalties and product sales. Such approval may be subject to limitations on the indicated uses for which
the product may be marketed or require costly, post-marketing follow-up studies.

If we fail to comply with applicable regulatory
requirements in the United States and other countries, among other things, we may be subject to fines and other civil penalties, delays in approving or failure to approve a product, suspension or withdrawal of regulatory approvals, product recalls,
seizure of products, operating restrictions, interruption of manufacturing or clinical trials, injunctions and criminal prosecution.

If our
competitors develop and market products that are more effective than our product candidates, they may reduce or eliminate our commercial opportunities.

Competition in the pharmaceutical industry is intense and is expected to increase. We face competition from pharmaceutical and biotechnology companies, as well as numerous academic and research institutions and



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governmental agencies, both in the United States and abroad. Some of these competitors have products or are pursuing the development of drugs that target the
same diseases and conditions that are the focus of our product development programs.

Our competitors could have products that are in
advanced development and may succeed in developing drugs that are more effective, safer and more affordable or more easily administered than ours, or that achieve patent protection or commercialization sooner than our products. Our competitors may
also develop alternative therapies that could further limit the market for any drugs that we may develop.

In many of our target disease
areas, potential competitors are working to develop new compounds with different mechanisms, biologies and side effects. Many of our competitors have substantially greater capital and research and development resources, manufacturing, sales and
marketing capabilities and production facilities than we do. Smaller companies also may prove to be significant competitors, particularly through proprietary research discoveries and collaboration arrangements with established pharmaceutical
companies.

Rapid technological change could make our products obsolete.

Biopharmaceutical technologies have undergone rapid and significant change and we expect that they will continue to do so. As a result, there is
significant risk that our current product candidates may be rendered obsolete or uneconomical by new discoveries before we recover any expenses incurred in connection with their development. If our product candidates are rendered obsolete by
advancements in biopharmaceutical technologies, our future prospects will suffer.

Consumers may sue us for product liability, which could result in
substantial liabilities that exceed our available resources and damage our reputation.

Developing and commercializing drug products
entails significant product liability risks. Liability claims may arise from our and our partners use of products in clinical trials and the commercial sale of those products.

Consumers may make product liability claims directly against us and/or our collaborators, and our collaborators or others selling these products may seek
contribution from us if they incur any loss or expenses related to such claims. We currently have insurance that covers our clinical trials. We believe our current insurance coverage is reasonably adequate at this time. We will, however, need to
increase and expand this coverage as we commence additional clinical trials, as well as larger scale trials, and if our product candidates are approved for commercial sale. This insurance may be prohibitively expensive or may not fully cover our
potential liabilities. Inability to obtain sufficient insurance coverage at an acceptable cost or otherwise to protect against potential product liability claims could prevent or inhibit the commercialization of products that we or one of our
partners develop. Product liability claims could have a material adverse effect on our business and results of operations. Liability from such claims could exceed our total assets if we do not prevail in any lawsuit brought by a third party alleging
that an injury was caused by one or more of our drug products.

Health care reform measures could adversely affect our business.

The business and financial condition of pharmaceutical and biotechnology companies are affected by the efforts of governmental and third-party payers
to contain or reduce the costs of health care. In the United States and in foreign jurisdictions there have been, and we expect that there will continue to be, a number of legislative and regulatory proposals aimed at changing the health care
system. For example, in some countries other than the United States, pricing of prescription drugs is subject to government control, and we expect proposals to implement similar controls in the United States to continue. Another example of proposed
reform that could affect our business is the current discussion of drug reimportation into the United States. In 2000, Congress directed the FDA to adopt regulations allowing the reimportation of approved drugs originally manufactured in the United
States back into the United States from other countries where the drugs were sold at lower prices.



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Although the Secretary of Health and Human Services has refused to implement this directive, in July 2003, the House of Representatives passed a similar bill
that does not require the Secretary of Health and Human Services to act. The reimportation bills have not yet resulted in any new laws or regulations; however, these and other initiatives could decrease the price we or any potential collaborators
receive for our product candidates once they are approved for sale, adversely affecting our future revenue growth and potential profitability. Moreover, the pendency or approval of such proposals could result in a decrease in our stock price or our
ability to raise capital or to obtain strategic partnerships or licenses.

Risks Related to the Market for our Common Stock

Our stock price may be volatile, and you may not be able to resell our shares at a profit or at all.

The trading price of our common stock could fluctuate due to the factors discussed in this Report. For example, since the date of our initial public
offering through March 31, 2006, our stock has traded as high as 440 Japanese Yen (or approximately $4.19) and as low as 105 Japanese Yen (or approximately $0.89) per share. The trading market for our common stock also may be influenced by the
research and reports that industry or securities analysts publish about us or our industry. If one or more of the analysts who cover us or our industry were to publish an unfavorable research report or to downgrade our stock, our stock price likely
would decline. If one or more of these analysts were to cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which in turn could cause our stock price or trading volume to
decline.

If the holders of the shares offered by the registration statement dated September 19, 2005, or the registration statement dated
November 23, 2005 were to determine to sell all or a significant portion of their shares at one time, there would be significant downward pressure on our stock price and it may be difficult to sell your shares.

On September 19, 2005, we filed a Registration Statement on Form S-1 to register 67,335,356 shares of common stock for resale from time to time,
which registration statement was subsequently declared effective by the U.S. Securities and Exchange Commission, or SEC. The registered shares were beneficially owned by 47 holders. On November 23, 2005, we filed a Registration Statement on
Form S-1 to register 13,356,572 shares issuable upon the exercise of warrants held by three individuals, of which warrants held by our two founders that relate to 12,856,572 shares are exercisable at $0.10 per share and a warrant held by a separate
investor that relates to 500,000 shares is exercisable at $1.00 per share. The trading volume for our stock is low, with an average trading volume of approximately 610,526 shares per day during the month of January 2006. If the holders of the shares
offered by these registration statements, to the extent such shares have not been sold already, were to attempt immediately to sell their shares, there would be significant downward pressure on our stock price and it may be difficult, or even
impossible, to find a buyer for shares of our common stock. The warrants held by our founders expire in 2007 and the warrant held by the other party expires in 2009. If the foregoing warrants are exercised, our stockholders will experience immediate
and substantial dilution.

Anti-takeover provisions in our charter documents and under Delaware law may make an acquisition of us more complicated
and the removal and replacement of our directors and management more difficult.

Our restated certificate of incorporation and
amended and restated bylaws contain provisions that may delay or prevent a change in control, discourage bids at a premium over the market price of our common stock or adversely affect the market price of our common stock and the voting and other
rights of the holders of our common stock. These provisions may also make it difficult for stockholders to remove and replace our board of directors and management. These provisions:



| |  |  | establish that members of the board of directors may be removed only for cause upon the affirmative vote of stockholders owning at least a majority of our capital stock;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | authorize the issuance of blank check preferred stock that could be issued by our board of directors in a discriminatory fashion designed to increase the number of
outstanding shares and prevent or delay a takeover attempt;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | limit who may call a special meeting of stockholders;
| | - |  | -----------------------------------------------------



| |  |  | establish advance notice requirements for nominations for election to the board of directors or for proposing matters that can be acted upon at stockholder meetings;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | prohibit our stockholders from making certain changes to our restated certificate of incorporation or amended and restated bylaws except with 662/3% stockholder approval; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | provide for a classified board of directors with staggered terms.
| | - |  | -----------------------------------------------------------------

We also may be subject to provisions of the Delaware corporation law that, in general, prohibit any business combination with a beneficial owner of 15% or more of our common stock for three years unless the holders acquisition of our
stock was approved in advance by our board of directors.

Although we believe these provisions collectively provide for an opportunity to
receive higher bids by requiring potential acquirors to negotiate with our board of directors, they would apply even if the offer may be considered beneficial by some stockholders. In any event, these provisions may delay or prevent a third party
from acquiring us. Any such delay or prevention could cause the market price of our common stock to decline.

We have never paid dividends on our
capital stock, and we do not anticipate paying any cash dividends in the foreseeable future.

We have paid no cash dividends on any
of our classes of capital stock to date and we currently intend to retain our future earnings, if any, to fund the development and growth of our businesses. In addition, the terms of existing or any future debts may preclude us from paying these
dividends. As a result, appreciation in the market value, if any, of our common stock will be our stockholders sole source of gain for the foreseeable future. The market value for our common stock has decreased since the time of the initial
public offering, may not increase, and in fact, the market value may decrease further.

Any increase in the market value of our common
stock is uncertain and unpredictable. Stockholders should not invest in our stock if they are seeking dividend income.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.

We effected the initial public
offering of our common stock pursuant to a Registration Statement on Form S-1 (File No. 333-119433) that was declared effective by the Securities and Exchange Commission on January 28, 2005.

As of March 31, 2006, we had used approximately $27.5 million of the net proceeds from our initial public offering to fund our operations, including
development of our clinical programs and payment of $0.4 million in compensation to our Executive Chairman of the Board and President and Chief Executive Officer, and Acting Chief Financial Officer, Dr. Yuichi Iwaki. In addition, as of
March 31, 2006, we had used $1.0 million for acquisitions of property and equipment. Other than the compensation paid to Dr. Iwaki, no proceeds were paid directly to any of our directors or officers (or their associates) or persons
owning ten percent or more of any class of our equity securities or to any other affiliates. We expect to use a majority of the remainder of the net proceeds from our initial public offering to continue the development of our existing clinical
programs. In addition, we may use a portion of the net proceeds from our initial public offering to acquire technologies or businesses that are complementary to our own, but we currently have no commitments or agreements relating to any such
transaction.

We cannot specify with certainty all of the particular uses for the net proceeds received from our initial public offering.
The amount and timing of our expenditures will depend on several factors, including, the progress of our development efforts and the amount of cash used in our operations. Accordingly, our



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management will have broad discretion in the continued application of the net proceeds from our initial public offering. Pending the uses described above, we
plan to invest the net proceeds from our initial public offering in short-term, investment-grade, interest-bearing instruments.

Repurchases of Equity
Securities

|              |  |                                      |  |                                                   |  |                                                                          |  |                                                              
|------------- |  | ------------------------------------ |  | ------------------------------------------------- |  | ------------------------------------------------------------------------ |  | -------------------------------------------------------------
|Period        |  | Total Numberof SharesPurchased(#)(a) |  | WeightedAverage PricePaid per Share(Japanese
yen) |  | Total Number ofSharesPurchased asPart of PubliclyAnnouncedProgram (#)(a) |  | Number of Sharesthat may yet bePurchased underOur Program (#)
|January 2006  |  |                                     |  |                                                  |  | 50,000                                                                   |  | 4,950,000                                                    
|              |  |                                      |  |                                                  
|February 2006 |  | 332,000                              |  | 126 yen (approximately $1.08)                     |  | 382,000                                                                  |  | 4,618,000                                                    
|              |  |                                      |  |                                                  
|March 2006    |  | 416,000                              |  | 129 yen (approximately $1.11)                     |  | 798,000                                                                  |  | 4,202,000                                                    
|              |  |                                      |  |                                                  
|Total         |  | 748,000                              |  | 128 yen (approximately $1.10)                     |  | 798,000                                                                  |  | 4,202,000                                                    

---

|(a) | In December 2005, our Board of Directors authorized the repurchase of up to 5.0 million shares of our common stock at an aggregate purchase price of up to 700.0 million
Japanese yen. This repurchase program will expire no later than June 12, 2006. We publicly announced the repurchase program in our press release dated December 5, 2005, which was attached as Exhibit 99.1 of our Current Report of Form 8-K
filed with the SEC on December 5, 2005.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

ITEM 3. DEFAULTS UPON SENIOR SECURITIES.

None.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

At our Annual Meeting of Stockholders held
May 4, 2006, Yuichi Iwaki, M.D., Ph.D., and Daniel Vapnek, Ph.D. were re-elected Class II Directors to serve until the Annual Meeting of Stockholders in 2009 or until their successors are duly elected. Also at the Annual Meeting, stockholders
ratified the Board of Directors selection of Ernst & Young LLP as our registered independent public accounting firm for the year ended December 31, 2006.

Votes were cast as follows:



|                         |  |            |  |                    |  |        
|------------------------ |  | ---------- |  | ------------------ |  | -------
|Election of Directors    |  |            |  |                    |  |        
|                         |  | For        |  | Withhold Authority
|Yuichi Iwaki M.D., Ph.D. |  | 58,385,756 |  | 785,000            |  |        
|Daniel Vapnek, Ph.D.     |  | 58,404,756 |  | 766,000            |  |        
|                         |  |            | 
|Ratification of Auditors |  |            |  |                    |  |        
|                         |  | For        |  | Against            |  | Abstain
|                         |  | 58,970,756 |  | 123,000            |  | 77,000 



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ITEM 5. OTHER INFORMATION.

None.

ITEM 6. EXHIBITS



|              |  |                                                                                                                                                         
|------------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------
|ExhibitNumber |  | Description                                                                                                                                             
|              | 
|31.1          |  | Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                         
|              | 
|31.2          |  | Certification of Principal Accounting Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                
|              | 
|32.1          |  | Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002).
|              | 
|32.2          |  | Certification of Principal Accounting Officer pursuant to 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002).                       



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SIGNATURES

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



|                   |  |                  |  |                                                                                                                                                                                                                     
|------------------ |  | ---------------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                   |  | MEDICINOVA, INC.
|                   |  |                 
|Date: May 10, 2006 |  | By:              |  | /S/ YUICHI IWAKI                                                                                                                                                                                                    
|                   |  |                  |  | Yuichi Iwaki, M.D., Ph.D. President and Chief Executive Officer and Acting Chief Financial Officer (on behalf of the registrant and as the registrants Principal Executive Officer and Principal Financial
Officer)



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INDEX TO EXHIBITS



|              |  |                                                                                                                                                         
|------------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------
|ExhibitNumber |  | Description                                                                                                                                             
|              | 
|31.1          |  | Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                         
|              | 
|31.2          |  | Certification of Principal Accounting Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                
|              | 
|32.1          |  | Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002).
|              | 
|32.2          |  | Certification of Principal Accounting Officer pursuant to 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002).                       



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