Sofosbuvir IMpurity Sofosbuvir impurity H sofosBuvir impurity 47 Sofosbuvir impurity M SofosBuvir Impurity 40 SofosBuvir Impurity 42 Sofosbuvir Impurity 7 sofosBuvir impurity 41 sofosBuvir impurity 1 SofosBuvir impurity 45 (2R,3R,4R,5R)-5-(4-benzaMido-2-oxopyriMidin-1(2H)-yl)-2-((benzoyloxy)Methyl)-4-chloro-4-Methyltetrahydrofuran-3-yl benzoate PSI 352707-13C,D3 Sofosbuvir metabolites GS566500 SofosBuvir impurity 48 Sofosbuvir impurity L Sofosbuvir IMpurity 4 Sofosbuvir IMpurity B Sofosbuvir Impurity U