2-[(2-amino-6-oxo-3H-purin-9-yl)methoxy]ethyl (2S)-2-aminopropanoate; Acyclovir alaninate; Valaciclovir EP Impurity H; Valacyclovir EP Impurity H; Valaciclovir EP Impurity H HCl; Valacyclovir Impurity H (EP); L-Alanine, 2-[(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)methoxy]ethyl ester; Valacyclovir Impurity 22; Valaciclovir Impurity H