9H-Imidazo[1,2-a]purin-9-one, 3-[2-O-[[[(1S,2R,3R)-3-(6-chloro-9H-purin-9-yl)-2-(hydroxymethyl)cyclobutyl]methoxy](2-cyanoethoxy)phosphinyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-3,5-dihydro-5-[2-(4-nitrophenyl)ethyl]-

9H-Imidazo[1,2-a]purin-9-one, 3-[2-O-[[[(1S,2R,3R)-3-(6-amino-9H-purin-9-yl)-2-[(triphenylmethoxy)methyl]cyclobutyl]methoxy]mercaptophosphinyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-5-O-[(3aS,6R,7aS)-hexahydro-3a-methyl-6-(1-methylethenyl)-2-sulfido-1,3,2-benzoxathiaphosphol-3-yl]-β-D-ribofuranosyl..

9H-Imidazo[1,2-a]purin-9-one, 3-[2-O-[[[(1S,2R,3R)-3-(6-amino-9H-purin-9-yl)-2-[(triphenylmethoxy)methyl]cyclobutyl]methoxy]mercaptophosphinyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-3,5-dihydro-5-[2-(4-nitrophenyl)ethyl]-

9H-Imidazo[1,2-a]purin-9-one, 3-[2-O-[[[(1S,2R,3R)-3-(6-amino-9H-purin-9-yl)-2-[(triphenylmethoxy)methyl]cyclobutyl]methoxy]mercaptophosphinyl]-5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-3,5-dihydro-5-[2-(4-nitrophenyl)ethyl]-

9H-Imidazo[1,2-a]purin-9-one, 3-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-O-[(3aR,6S,7aR)-hexahydro-3a-methyl-6-(1-methylethenyl)-2-sulfido-1,3,2-benzoxathiaphosphol-3-yl]-β-D-ribofuranosyl]-3,5-dihydro-5-[2-(4-nitrophenyl)ethyl]-

9H-Imidazo[1,2-a]purin-9-one, 3-[2-O-[[[(1S,2R,3R)-3-(6-chloro-9H-purin-9-yl)-2-(hydroxymethyl)cyclobutyl]methoxy](2-cyanoethoxy)phosphinothioyl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-3,5-dihydro-5-[2-(4-nitrophenyl)ethyl]-

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-3,5-dihydro-5-[2-(4-nitrophenyl)ethyl]-9H-imidazo[1,2-a]purin-9-one