1015073-42-3

(2'R)??-2'-??Deoxy-??2'-??fluoro-??2'-??methyl-uridine 5'-??Triphosphate Tetrasodium Salt is an impurity of Sofosbuvir (P839640) which is a prodrug that is metabolized to the active antiviral agent 2'-deoxy-2'-a-fluoro-b-C-methyluridine-5'-monophosphate.