2-[(2-Acetamido-6-oxo-1,6-dihydro-7H-purin-7-yl)methoxy]ethyl acetate; N,O-Diacetate Isoacyclovir; 2-[[2-(Acetylamino)-6-oxo-1,6-dihydro-7H-purin-7-yl]methoxy]ethyl Acetate; N,O-Diacetate Isoacyclovir; Acetamide, N-[7-[[2-(acetyloxy)ethoxy]methyl]-6,7-dihydro-6-oxo-1H-purin-2-yl]-; N-[7-[[2-(Acetyloxy)ethoxy]methyl]-6,7-dihydro-6-oxo-1H-purin-2-yl]acetamide; Aciclovir Impurity M