7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-N-cyclopentyl-7-[5-deoxy-5-[[8-methyl-2-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-2-oxido-6-oxo-3,5,7-trioxa-2-phosphanon-1-yl]sulfonyl]-β-D-ribofuranosyl]-

2-Chloro-4-[(2S)-2-methyl-1-pyrrolidinyl]-7-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine

(2R)-1-[2-Chloro-7-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-2-pyrrolidinemethanol

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-N-cyclopentyl-7-[5-O-[(1,4-dihydro-8-methyl-2-oxido-2H-3,1,2-benzoxazaphosphor-2-yl)methyl]-β-D-ribofuranosyl]-

3-[6-Chloro-1-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-yl]-3-azabicyclo[3.1.0]hexane

6-Chloro-N-cyclopentyl-1-[5-O-[[[(2,2-dimethyl-1-oxopropoxy)methoxy]hydroxyphosphinyl]methyl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[5-O-[[Bis[(2,2-dimethyl-1-oxopropoxy)methoxy]phosphinyl]methyl]-β-D-ribofuranosyl]-6-chloro-N-cyclopentyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2-[4-(Cyclopentylamino)-1-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-6-yl]ethynyl]cyclopropanol

6-Chloro-4-(3,3-difluoro-1-pyrrolidinyl)-1-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidine

6-Chloro-4-(hexahydrocyclopenta[c]pyrrol-2(1H)-yl)-1-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidine

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-N-cyclopentyl-7-[5-O-(2-hydroxy-7,7-dimethyl-2-oxido-6-oxo-3,5,9,12-tetraoxa-2-phosphatridec-1-yl)-β-D-ribofuranosyl]-

4-[4-(Cyclopentylamino)-7-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-2-yl]-2-methyl-3-butyn-2-ol

6-Chloro-N-(3,3-difluorocyclobutyl)-1-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

6-Chloro-N-cyclobutyl-1-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

6-Chloro-N-[(1R)-1-(4-fluorophenyl)ethyl]-1-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-N-cyclopentyl-7-[5-O-[2-[[3-(2-methoxyethoxy)-2,2-dimethyl-1-oxopropoxy]methoxy]-7,7-dimethyl-2-oxido-6-oxo-3,5,9,12-tetraoxa-2-phosphatridec-1-yl]-β-D-ribofuranosyl]-

(2R)-4-[4-(Cyclopentylamino)-7-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-2-yl]-3-butyn-2-ol

N-Cyclopentyl-7-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-2-(1-propyn-1-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine

N-Cyclopentyl-7-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-2-(2-pyridinylmethoxy)-7H-pyrrolo[2,3-d]pyrimidin-4-amine

1-[[4-(Cyclopentylamino)-7-[5-O-(phosphonomethyl)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-2-yl]oxy]-2-propanol