IDENIX PHARMACEUTICALS, INC. (a Delaware corporation) 7,248,936 Shares of Common Stock PURCHASE AGREEMENTPurchase Agreement • August 5th, 2009 • Idenix Pharmaceuticals Inc • Pharmaceutical preparations • New York
Idenix Pharmaceuticals, Inc., a Delaware corporation (the “Company”) confirms its agreement with Leerink Swann LLC (“Leerink Swann”) and each of the other Underwriters named in Schedule A hereto (collectively, the “Underwriters,” which term shall also include any underwriter substituted as hereinafter provided in Section 10 hereof), for whom Leerink Swann is acting as representative (in such capacity, the “Representative”), with respect to the issue and sale by the Company and the purchase by the Underwriters, acting severally and not jointly, of the respective numbers of shares of Common Stock, par value $0.001 per share, of the Company (“Common Stock”) set forth in said Schedule A. The aforesaid 7,248,936 shares of Common Stock to be purchased by the Underwriters are hereinafter called the “Securities.” If the only firm named in Schedule A hereto is Leerink Swann, then the term “Underwriters” shall be deemed to refer solely to Leerink Swann.
