[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][Branch1][C][C][C@@H1][Branch2][Ring2][Ring2][C][=Branch1][C][=O][O][C@@H1][C@H1][Branch2][Ring1][Branch2][O][C@H1][Branch1][Branch2][C@][Ring1][Branch1][Branch1][C][C][O][N][C][=C][C][=Branch1][=Branch1][=N][C][Ring1][=Branch1][=O][N][C][O][N]"}, {"from": "gpt", "value": "The molecule is the 3-O-valine ester prodrug of the nucleoside analog 2'-C-methylcytidine with anti-hepatitis C virus (HCV) activity. Upon administration, valopicitabine is converted into 2'-C-methylcytidine; upon phosphorylation into its 5-triphosphate form, this metabolite inhibits viral RNA chain elongation and viral RNA-dependent RNA polymerase activity. This blocks viral production of HCV RNA and thus viral replication."}]