Sofosbuvir is a nucleotide conjugate that is used in combination with ledipasvir (under the trade name Harvoni) for the treatment of chronic hepatitis C genotype 1 infection. It has a role as a prodrug, an antiviral drug and a hepatitis C protease inhibitor. It is a L-alanyl ester, a phosphoramidate ester, a nucleotide conjugate, an organofluorine compound and an isopropyl ester. It is functionally related to a uridine 5'-monophosphate.