175865-59-5 L-Valine, 2-((2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)methoxy)-3-hydroxypropyl ester, monohydrochloride RO 107-9070/194 RS 079070-194 Valcyt Valcyte Valganciclovir hydrochloride