1-(2-Deoxy-2-fluoro-β-D-arabinofuranosyl)-3-(difluoromethoxy)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

4-Amino-1-[2-deoxy-2-fluoro-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-arabinofuranosyl]-1,2-dihydro-3H-pyrazolo[3,4-d]pyrimidin-3-one

1-[2-Deoxy-2-fluoro-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-arabinofuranosyl]-3-(phenylmethoxy)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

9-(1-Isoquinolinyl)-7-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-7H-pyrrolo[3,2-e]tetrazolo[1,5-c]pyrimidine

9-(3-Isoquinolinyl)-7-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-7H-pyrrolo[3,2-e]tetrazolo[1,5-c]pyrimidine

9-(2-Quinolinyl)-7-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-7H-pyrrolo[3,2-e]tetrazolo[1,5-c]pyrimidine

1-(2-Deoxy-2-fluoro-β-D-arabinofuranosyl)-3-(phenylmethoxy)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

3-[(3-Chlorophenyl)thio]-1-(2-deoxy-2-fluoro-β-D-arabinofuranosyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2-Deoxy-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-3-[(3-methylphenyl)thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-3-[(3-methylphenyl)thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-(2-Deoxy-2-fluoro-β-D-arabinofuranosyl)-3-[(3-methylphenyl)thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-(2-Deoxy-2-fluoro-β-D-arabinofuranosyl)-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-(3,5-Di-O-benzoyl-2-deoxy-2-fluoro-β-D-arabinofuranosyl)-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2-Deoxy-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-3-[(1-methyl-1H-imidazol-5-yl)thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-3-[(1-methyl-1H-imidazol-5-yl)thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-(2-Deoxy-2-fluoro-β-D-arabinofuranosyl)-3-[(1-methyl-1H-imidazol-5-yl)thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

N-[3-[2-Amino-7-[2-deoxy-5-O-[hydroxy[(hydroxyoxidophosphonophosphinyl)oxy]phosphinyl]-β-D-erythro-pentofuranosyl]-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl]-2-propyn-1-yl]-2,2,2-trifluoroacetamide