NCIt definition : The dihydrochloride salt of valopicitabine, a 3-O-valine ester prodrug form 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.;