Achillion Pharmaceuticals, Inc.
300 George Street
New Haven, CT 06511
October 18, 2006
BY EDGAR
United States Securities and Exchange Commission
Division of Corporation Finance
100 F Street, N.E.
Washington, DC 20549
Re: | Achillion Pharmaceuticals, Inc. |
Request to Withdraw Registration Statement on Form 8-A filed, April 5, 2006
File Number: 333-132921
Ladies and Gentlemen:
Achillion Pharmaceuticals, Inc. (the Company) hereby requests the consent of the Securities and Exchange Commission to withdraw the Form 8-A filed by the Company via EDGAR on April 5, 2006. The Company inadvertently filed the Form 8-A under Section 12(g) of the Securities Exchange Act of 1934. A corrected Form 8-A under Section 12(b) of the Securities Exchange Act of 1934 is being filed concurrently herewith.
Should you have any questions regarding this request, please contact me at 203-752-5414 or Susan Mazur of Wilmer Cutler Pickering Hale and Dorr LLP, counsel to the Company, at 781-966-2005.
Thank you for your assistance.
Very truly yours,
/s/ Mary Kay Fenton |
Mary Kay Fenton Vice President and Chief Financial Officer |