Acyclovir impurity 1/Acyclovir EP Impurity A/O-Acetyl Acyclovir/Valaciclovir EP Impurity I/2-[(2-Amino-6-oxo-1,6-dihydro-9H-purin-9-yl)methoxy]ethyl acetate;9-(2'-ACETOXYETHOXYMETHYL)-GUANINE;Acyclovir Related Compound A (50 mg) (2-[(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)methoxy]ethyl acetate);Acyclovir IMpurity A;9-[[2-(Acetyloxy)ethoxy]Methyl]-2-aMino-1,9-dihydro-6H-purin-6-one;Aciclovir impurity A (PhEur);Aciclovir Related Compound A (USP);2-[(2-Amino-6-oxo-1,6-dihydro-9H-purin-9-yl)methoxy]ethyl acetate