Daclatasvir- 13 C2,d 6 (BMS-790052- 13 C2,d 6 ) is 13 C and deuterium labeled Daclatasvir. Daclatasvir (BMS-790052) is a potent and orally active HCV NS5A protein inhibitor with EC 50 s range of 9-146 pM for multiple HCV replicon genotypes. Daclatasvir is also a organic anion transporting polypeptide 1B (OATP1B) and OATP1B3 inhibitor with IC 50 s of 1.5 μM and 3.27 μM, respectively.