??????????????? ??? ??? ??? DL-??? Sofosbuvir Impurity 17 sofosBuvir impurity 36 Sofosbuvir Impurity W ((2R,3R,4R,5R)-3-(benzoyloxy)-4-chloro-5-(2,4-dioxo-3,4-dihydropyriMidin-1(2H)-yl)-4-Methyltetrahydrofuran-2-yl)Methyl benzoate Sofosbuvir Sofosbuvir Impurity 32 SofosBuvir Impurity 18 sofosBuvir Impurity 35 Sofosbuvir metabolites GS566500 D-Alanine, N-[[P(R),2'R]-2'-deoxy-2'-fluoro-2'-Methyl-P-phenyl-5'-uridylyl]-, 1-Methylethyl ester SofosBuvir Impurity 3 SofosBuvir Impurity 55 2'-deoxy-2'-fluoro-2'-C-methyluridine Sofosbuvir impurity E Sofosbuvir Impurity U