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

N-[[[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-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

O-[(1,1-Dimethylethyl)dimethylsilyl]-N-[[[9-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-9H-purin-6-yl]amino]carbonyl]-L-threonine 2-(trimethylsilyl)ethyl ester

O-[(1,1-Dimethylethyl)dimethylsilyl]-N-[[[9-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-9H-purin-6-yl]amino]carbonyl]-L-threonine (1,1-dimethylethyl)dimethylsilyl ester

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-5-[[methyl(trifluoroacetyl)amino]methyl]-2-thio-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-5-[[methyl(trifluoroacetyl)amino]methyl]-2-thio-

N-[[[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-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

O-[(1,1-Dimethylethyl)dimethylsilyl]-N-[[(9-β-D-ribofuranosyl-9H-purin-6-yl)amino]carbonyl]-L-threonine 2-(trimethylsilyl)ethyl ester

O-[(1,1-Dimethylethyl)dimethylsilyl]-N-[[[9-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-9H-purin-6-yl]amino]carbonyl]-L-threonine