Hepatitis C virus (HCV) protease NS3/4A inhibitor. Orally bioavailable. Inhibits HCV RNA replication in vitro (IC50 = 0.35 μM). Also used in Stabilizable Polypeptide Linkages (StaPLs) chemogenetic platform, for pharmacological regulation of protein expression/function. StaPL sequences can be engineered into target proteins rendering them functional only in the presence of Telaprevir. Plasmid vectors for the transfection of cells with StaPLs are available from Addgene.. Purity 98%. MW (observed): 679.85