September ___, 2006 Cowen and Company, LLC CIBC World Markets Corp. JMP Securities LLC As representatives of the several Underwriters c/o Cowen and Company, LLC 1221 Avenue of the Americas New York, New York 10020 Re: Achillion Pharmaceuticals, Inc. -...Lock-Up Agreement • November 8th, 2006 • Advent International Corp Et Al • Pharmaceutical preparations
Cowen and Company, LLC CIBC World Markets Corp. JMP Securities LLC As representatives of the several Underwriters c/o Cowen and Company, LLC 1221 Avenue of the Americas New York, New York 10020
ACHILLION PHARMACEUTICALS, INC. Waiver of Registration Rights Reference is hereby made to that certain Second Amended and Restated Investor Rights Agreement (the "Agreement"), dated as of November 17, 2005 by and among Achillion Pharmaceuticals, Inc.,...Waiver of Registration Rights • November 8th, 2006 • Advent International Corp Et Al • Pharmaceutical preparations
Reference is hereby made to that certain Second Amended and Restated Investor Rights Agreement (the "Agreement"), dated as of November 17, 2005 by and among Achillion Pharmaceuticals, Inc., a Delaware corporation (the "Company"), the holders of the Company's Series A Preferred, Series B Preferred, Series C Preferred, Series C-1 Preferred and Series C-2 Preferred (collectively, the "Holders").
