N-[[[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-9H-purin-6-yl]amino]carbonyl]-O-[(1,1-dimethylethyl)dimethylsilyl]-L-threonine 2-(trimethylsilyl)ethyl ester

N-[[[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-9H-purin-6-yl]amino]carbonyl]-O-[(1,1-dimethylethyl)dimethylsilyl]-L-threonine 2-(trimethylsilyl)ethyl ester