PSI-6130 is a nucleoside inhibitor of the NS5B RNA polymerase of hepatitis C virus (HCV; Ki = 4.3 μM). It inhibits HCV genotype 1b (GT-1b) Con1 and GT-1a H77 viral replication in Huh7 replicon cells using a luciferase-based assay (EC50s = 0.51 and 0.30 μM, respectively). PSI-6130 also inhibits replication of HCV GT-1b and GT-1a replicons from clinical isolates, with EC50 values ranging from 0.60 to 1.41 μM, and 0.20 to 0.43 μM, respectively, in the same assay. It has little or no activity against West Nile Virus (WNV), Dengue type 2 virus (DV), human immunodeficiency virus (HIV), or hepatitis B virus (HBV; EC90s = 46.3, >100, >100, and >10 μM, respectively).
