3-[[(1S,2S)-2-[[(1,1-Dimethylethyl)dimethylsilyl]oxy]cyclopentyl]thio]-1-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

(1R,2R)-2-[[4-Amino-1-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]cyclopentanol

(1S,2S)-2-[[4-Amino-1-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]cyclopentanol

1-[5-O-[(1,1-Dimethylethyl)dimethylsilyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-3-[[(1R,2R)-2-[[(1,1-dimethylethyl)dimethylsilyl]oxy]cyclopentyl]thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[5-O-[(1,1-Dimethylethyl)dimethylsilyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-3-[[(1S,2S)-2-[[(1,1-dimethylethyl)dimethylsilyl]oxy]cyclopentyl]thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

(1R,2R)-2-[[4-Amino-1-[2,3-O-(1-methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]cyclopentanol

(1S,2S)-2-[[4-Amino-1-[2,3-O-(1-methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]cyclopentanol

(1R,2R)-2-[[4-Amino-1-[5-O-(aminosulfonyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]cyclopentanol

1-[2,3-O-(1-Methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-3-[[(2R)-2-[[(2S)-tetrahydro-2H-pyran-2-yl]oxy]propyl]thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2,3-O-(1-Methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-3-[[(2R)-2-[[(2R)-tetrahydro-2H-pyran-2-yl]oxy]propyl]thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2,3-O-(1-Methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-3-[[(2S)-2-[[(2R)-tetrahydro-2H-pyran-2-yl]oxy]propyl]thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2,3-O-(1-Methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-3-[[(2S)-2-[[(2S)-tetrahydro-2H-pyran-2-yl]oxy]propyl]thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2,3-O-(1-Methylethylidene)-β-D-ribofuranosyl]-3-[[2-[(tetrahydro-2H-pyran-2-yl)oxy]propyl]thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

(2R)-1-[[4-Amino-1-[2,3-O-(1-methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]-2-propanol

(2S)-1-[[4-Amino-1-[2,3-O-(1-methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]-2-propanol

1-[5-O-(Aminosulfonyl)-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-3-[(1-cyclohexen-1-ylmethyl)thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[[[4-Amino-1-[5-O-(aminosulfonyl)-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]methyl]cyclohexanol

1-[[[4-Amino-1-[2,3-O-(1-methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl]thio]methyl]cyclohexanol

4-Amino-1,2-dihydro-1-[2,3-O-(1-methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-3H-pyrazolo[3,4-d]pyrimidine-3-thione

1-[2,3-O-(1-Methylethylidene)-5-O-[tris(1-methylethyl)silyl]-β-D-ribofuranosyl]-3-(methylthio)-1H-pyrazolo[3,4-d]pyrimidin-4-amine