Cubist Pharmaceuticals, Inc. (Cubist) is a biopharmaceutical company focused on the research, development and commercialization of therapies to treat serious medical conditions in acutely ill patients who are hospitalized or are being treated in other acute care settings. As of December 31, 2011, the Company had two marketed products, CUBICIN (daptomycin for injection) and ENTEREG (alvimopan). The Company also co-promotes DIFICIDTM in the United States, under its co-promotion agreement with Optimer Pharmaceuticals, Inc. (Optimer). As of December 31, 2011, the Company had three drug candidates in late-stage clinical trials. On December 12, 2011, the Company acquired Adolor Corporation (Adolor) and rights to ENTEREG.