9-[5-O-[1-[[4-(Benzoylamino)phenyl]methyl]-2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-deoxy-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-amine

1,3-Bis(1,1-dimethylethyl) 2-[9-[5-O-[1-[[4-(benzoylamino)phenyl]methyl]-2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-yl]imidodicarbonate

9-[5-O-[2-[4-(Acetylamino)phenyl]-1,1-dicarboxyethyl]-2-deoxy-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-amine

9-[5-O-[1-[[4-(Acetylamino)phenyl]methyl]-2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-deoxy-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-amine

1,3-Bis(1,1-dimethylethyl) 2-[9-[5-O-[1-[[4-(acetylamino)phenyl]methyl]-2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-yl]imidodicarbonate

9-[5-O-[2-(4-Aminophenyl)-1,1-dicarboxyethyl]-2-deoxy-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-amine

9-[5-O-[1-[(4-Aminophenyl)methyl]-2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-amine

1,3-Bis(1,1-dimethylethyl) 2-[9-[5-O-[1-[(4-aminophenyl)methyl]-2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-yl]imidodicarbonate

2-Chloro-9-[2-deoxy-5-O-[1,1-dicarboxy-2-(4-nitrophenyl)ethyl]-2-fluoro-β-D-arabinofuranosyl]-9H-purin-6-amine

1H-Pyrazolo[3,4-d]pyrimidin-4-amine, 6-chloro-1-[2-deoxy-5-O-(1,1-dicarboxy-2-phenylethyl)-2-fluoro-β-D-arabinofuranosyl]-, C,C′-bis(1,1-dimethylethyl) ester

6-Chloro-1-[2-deoxy-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]-2-fluoro-β-D-arabinofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1,3-Bis(1,1-dimethylethyl) 2-[6-chloro-1-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]-2-fluoro-β-D-arabinofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[6-chloro-1-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-fluoro-β-D-arabinofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[6-chloro-1-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-2-fluoro-β-D-arabinofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[6-chloro-1-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[(1,1-dimethylethyl)diphenylsilyl]-2-fluoro-β-D-arabinofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-yl]imidodicarbonate

6-Chloro-1-[2-deoxy-5-O-[(1,1-dimethylethyl)diphenylsilyl]-2-fluoro-β-D-arabinofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

6-Chloro-1-(2-deoxy-2-fluoro-β-D-arabinofuranosyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

4,6-Dichloro-1-(3,5-di-O-benzoyl-2-deoxy-2-fluoro-β-D-arabinofuranosyl)-1H-pyrazolo[3,4-d]pyrimidine

2-Chloro-7-[2-deoxy-5-O-[1,1-dicarboxy-2-(4-carboxyphenyl)ethyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Chloro-7-[2-deoxy-5-O-[2-ethoxy-1-(ethoxycarbonyl)-1-[[4-(methoxycarbonyl)phenyl]methyl]-2-oxoethyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine