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

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

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

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

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

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

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

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

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