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NEW HAVEN, Conn., Aug. 18, 2010 (GLOBE NEWSWIRE) -- Achillion Pharmaceuticals, Inc., (Nasdaq:ACHN) a leader in the discovery and development of small molecule drugs to combat the most challenging infectious diseases, today announced that it has entered into definitive agreements for the purchase of $50.1 million of Achillion's common stock and warrants in a private placement financing with a select group of institutional and accredited investors, namely Domain Associates, Clarus Ventures, Quaker BioVentures and Pappas Ventures. The investment in Achillion consists of the sale and issuance of 19,755,101 shares of common stock at a price of $2.49 per share, the consolidated closing bid price reported by NASDAQ on August 17, 2010, as well as the sale and issuance of warrants to purchase 0.35 shares of common stock for each share of common stock at a price of $0.125 per warrant share. The warrants, which represent the right to acquire an aggregate of 6,921,285 shares of common stock, have a seven-year term from the date of issuance and will be exercisable at a price of $3.1125 per share. The transaction is expected to close on or about August 20, 2010, subject to the satisfaction of certain customary closing conditions.