Achillion Pharmaceuticals, Inc. (Achillion) is a biopharmaceutical company focused on the discovery, development and commercialization of treatments for infectious diseases. Within the anti-infective market, it focuses on the development of antivirals for the treatment of chronic hepatitis C and the development of antibacterials for the treatment of resistant bacterial infections. As of December 31, 2008, Achillion focused its efforts on advancing two late-stage preclinical candidates: ACH-1095, an NS4A antagonist for the treatment of chronic hepatitis C, being developed in collaboration with Gilead Sciences, Inc. (Gilead), and ACH-1625, a protease inhibitor also for the treatment of chronic hepatitis C. It has a pipeline of other product candidates, for which it is seeking appropriate collaborative partners. These product candidates include elvucitabine for the treatment of human immunodeficiency virus (HIV) infection and ACH-702 for the treatment of serious bacterial infections.