LEXINGTON, Mass. & SAN DIEGO--(BUSINESS WIRE)-- Cubist Pharmaceuticals, Inc. (NASDAQ: CBST) and Trius Therapeutics, Inc. (NASDAQ: TSRX) today announced that they have signed a definitive agreement under which Cubist will acquire all outstanding shares of Trius (TSRX) for $13.50 per share in cash or approximately $707 million on a fully diluted basis. In addition to the upfront cash payment, each Trius stockholder will receive one Contingent Value Right (CVR), entitling the holder to receive an additional cash payment of up to $2.00 for each share they own if certain commercial sales milestones are achieved. The total transaction is valued at up to $818 million on a fully diluted basis. The transaction has been approved by the Boards of Directors of both companies. The companies expectation is to close the transaction later this year, subject to required regulatory approvals and other customary closing conditions. Cubist will host a conference call and webcast today at 6:00 p.m. ET (details below).