5-Chloro-N-cyclopentyl-3-[2-deoxy-5-O-[(diethoxyphosphinyl)methyl]-2-fluoro-3-O-(tetrahydro-2H-pyran-2-yl)-β-D-arabinofuranosyl]-3H-imidazo[4,5-b]pyridin-7-amine

5-Chloro-N-cyclopentyl-3-[2-deoxy-5-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-3-O-(tetrahydro-2H-pyran-2-yl)-β-D-arabinofuranosyl]-3H-imidazo[4,5-b]pyridin-7-amine

2-Chloro-N-cyclopentyl-9-[2-deoxy-5-O-[(diethoxyphosphinyl)methyl]-2-fluoro-3-O-(tetrahydro-2H-pyran-2-yl)-β-D-arabinofuranosyl]-9H-purin-6-amine

2-Chloro-N-cyclopentyl-9-[2-deoxy-5-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-3-O-(tetrahydro-2H-pyran-2-yl)-β-D-arabinofuranosyl]-9H-purin-6-amine

2-Chloro-N-cyclopentyl-9-[2-deoxy-5-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-9H-purin-6-amine

5-Chloro-N-cyclopentyl-3-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-3H-imidazo[4,5-b]pyridin-7-amine

5-Chloro-N-cyclopentyl-3-[2-deoxy-5-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-3H-imidazo[4,5-b]pyridin-7-amine

2-Chloro-N-[(1S)-1-(4-fluorophenyl)ethyl]-7-[5-O-[8-methyl-2-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-2-oxido-6-oxo-3,5,7-trioxa-2-phosphanon-1-yl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Chloro-7-[5-O-[8-methyl-2-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-2-oxido-6-oxo-3,5,7-trioxa-2-phosphanon-1-yl]-β-D-ribofuranosyl]-4-(1-pyrrolidinyl)-7H-pyrrolo[2,3-d]pyrimidine

6-Chloro-N-[(1S)-1-(4-fluorophenyl)ethyl]-1-[5-O-[8-methyl-2-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-2-oxido-6-oxo-3,5,7-trioxa-2-phosphanon-1-yl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-b]pyridin-4-amine

6-Chloro-N-[(1R)-1-(4-fluorophenyl)ethyl]-1-[5-O-[8-methyl-2-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-2-oxido-6-oxo-3,5,7-trioxa-2-phosphanon-1-yl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

6-Chloro-N-[(1S)-1-(4-fluorophenyl)ethyl]-1-[5-O-[8-methyl-2-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-2-oxido-6-oxo-3,5,7-trioxa-2-phosphanon-1-yl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

6-Chloro-1-[5-O-[8-methyl-2-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-2-oxido-6-oxo-3,5,7-trioxa-2-phosphanon-1-yl]-β-D-ribofuranosyl]-N-[(1S)-1-phenylethyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine