更昔洛韦

(2S)-2-azido-3-methylbutanoic acid

N-trytil-2-(2-amino-1,6-dihydro-6-oxopurin-9-yl)methoxy-3-trityloxy-1'-propanyl-2'-(S)-azido-3'-methylbutanoate

N2-trityl-9-<(3-hydroxy-2-propoxy-1-trityloxy)methyl>guanine

valganciclovir acetate