FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
AMARANTH LLC
   2. Issuer Name and Ticker or Trading Symbol
Healthcare Acquisition Partners Corp. [HAQPU] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
ONE AMERICAN LANE		 3. Date of Earliest Transaction (Month/Day/Year)
04/20/2006
(Street)

GREENWICH, CT 06831		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Shares 04/20/2006   S   149,450 D $ 6.0625 1,835,700 D (1) (2)  
Common Shares 04/20/2006   S   89,800 D $ 6.0625 1,745,900 D (1) (2)  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
AMARANTH LLC
ONE AMERICAN LANE
GREENWICH, CT 06831		     X    
AMARANTH GLOBAL EQUITIES MASTER FUND LTD

 		     X    

Signatures

 Nicholas M. Maounis, Managing Member of Amaranth Advisors, L.L.C., Trading Advisor for Amaranth LLC   04/24/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents transactions by Amaranth LLC, a Caymans Islands exempted company ("Amaranth"). Amaranth Global Equities Master Fund Limited, a Cayman Islands exempted company ("Global") directly owns 77,350 shares of common stock.
(2) Amaranth Advisors L.L.C., a Delaware limited liability company ("Advisors") is the trading advisor of Amaranth and Global. Nicholas M. Maounis ("Maounis") is the Managing Member of Advisors and therefore may be deemed to share beneficial ownership of the shares beneficially owned by Amaranth and Global. Amaranth, Global, Advisors and Maounis each disclaims beneficial ownership of the securities with respect to which indirect beneficial ownership is reported in this Form 3, except to the extent of its or his respective pecuniary interest therein. Pursuant to Rule 16a-1(4) promulgated under the Securities Exchange Act of 1934, as amended, each of the Reporting Persons herein states that the filing of this Form 3 and the statements made herein shall not be deemed an admission that he or it is the beneficial owner of any of the securities covered by this Form.

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