(2S)-2-((2-amino-6-oxo-1H-purin-9(6H)-yl)methoxy)-3-hydroxypropyl 2-amino-3-methylbutanoate hydrochloride; 2-[(2-Amino-1,6-dihydro-6-oxo-9H-purin-9-yl)methoxy]-3-hydroxypropyl Ester L-Valine Hydrochloride; RS 079070-194; Ro 107-9070/194; Valcyte; (S)-Valganciclovir Hydrochloride; Ganciclovir Mono-N-methyl Valinate Impurity