Shanghai Targetdrug Ltd. (TD) is a pharmaceutical research and development company, principally focused on drug discovery and development based on G protein coupled receptors (GPCR). It is engaged in the development of small molecule drug discovery. The product pipeline of the company include Nifeviroc, Microbicide and Anti-HCV drugs. TD also offers Chemokine receptors (CCR2, CCR5) for autoimmune diseases and CXCR4 for the treatment of leukemia and other types of tumors. In addition, the company also offers various other screening services. TD is headquartered in Shanghai, China.