1H-Pyrazolo[3,4-d]pyrimidine-6-carbonitrile, 4-(cyclopentylamino)-1-[5-deoxy-2,3-O-(1-methylethylidene)-5-[(phosphonomethyl)sulfonyl]-β-D-ribofuranosyl]-

1H-Pyrazolo[3,4-d]pyrimidine-6-carbonitrile, 4-(cyclopentylamino)-1-[5-deoxy-5-[[(diethoxyphosphinyl)methyl]sulfonyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-

1H-Pyrazolo[3,4-d]pyrimidine-6-carbonitrile, 4-(cyclopentylamino)-1-[5-S-[(diethoxyphosphinyl)methyl]-2,3-O-(1-methylethylidene)-5-thio-β-D-ribofuranosyl]-

4-(Cyclopentylamino)-1-[2,3-O-(1-methylethylidene)-5-O-(methylsulfonyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidine-6-carbonitrile

4-(Cyclopentylamino)-1-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidine-6-carbonitrile

2-Chloro-N-cyclopentyl-7-[5-O-[hydroxy(phosphonomethoxy)phosphinyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2,4-Dichloro-7-[5-O-[hydroxy(phosphonomethoxy)phosphinyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 7-[5-[[[bis(1-methylethoxy)phosphinyl]methyl]sulfonyl]-5-deoxy-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-2-chloro-N-cyclopentyl-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-N-cyclopentyl-7-[2,3-O-(1-methylethylidene)-5-thio-β-D-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 7-[5-S-acetyl-2,3-O-(1-methylethylidene)-5-thio-β-D-ribofuranosyl]-2-chloro-N-cyclopentyl-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-7-[5-deoxy-2,3-O-(1-methylethylidene)-5-[(phosphonomethyl)sulfonyl]-β-D-ribofuranosyl]-N-[(1R)-1-phenylethyl]-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-7-[5-deoxy-5-[[(diethoxyphosphinyl)methyl]sulfonyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-N-[(1R)-1-phenylethyl]-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-7-[5-S-[(diethoxyphosphinyl)methyl]-2,3-O-(1-methylethylidene)-5-thio-β-D-ribofuranosyl]-N-[(1R)-1-phenylethyl]-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 7-[5-[[[bis[(2,2-dimethyl-1-oxopropoxy)methoxy]phosphinyl]methyl]sulfonyl]-5-deoxy-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-2-chloro-N-cyclopentyl-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-7-[5-deoxy-2,3-O-(1-methylethylidene)-5-(methylsulfonyl)-β-D-ribofuranosyl]-N-[(1R)-1-phenylethyl]-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 7-[5-[[[bis[(2,2-dimethyl-1-oxopropoxy)methoxy]phosphinyl]methyl]sulfinyl]-5-deoxy-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-2-chloro-N-cyclopentyl-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 7-[5-S-[[bis[(2,2-dimethyl-1-oxopropoxy)methoxy]phosphinyl]methyl]-2,3-O-(1-methylethylidene)-5-thio-β-D-ribofuranosyl]-2-chloro-N-cyclopentyl-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-N-cyclopentyl-7-[2,3-O-(1-methylethylidene)-5-S-(phosphonomethyl)-5-thio-β-D-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 7-[5-S-[[bis(1-methylethoxy)phosphinyl]methyl]-2,3-O-(1-methylethylidene)-5-thio-β-D-ribofuranosyl]-2-chloro-N-cyclopentyl-

7H-Pyrrolo[2,3-d]pyrimidin-4-amine, 2-chloro-N-cyclopentyl-7-[5-deoxy-5-C-[(S)-ethylsulfinyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-