Idenix Letterhead] September 9, 2013 David Standring Milton, MA 02186 Dear David:Idenix Pharmaceuticals Inc • February 27th, 2014 • Pharmaceutical preparations • Massachusetts
Company FiledFebruary 27th, 2014 Industry JurisdictionAs we have discussed, your employment with Idenix Pharmaceuticals, Inc. (“Idenix” or the “Company”) will end on September 9, 2013. The Company will provide you with the severance benefits described in paragraph 2 below if you sign and return this letter agreement (the “Agreement”) to me on or before October 25th, 2013 (i.e. within 45 days from your receipt of this Agreement) — but no earlier than the close of business on September 9, 2013, and the Agreement becomes binding between you and the Company.