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

[[3-[4-Amino-1-[2-deoxy-5-O-[hydroxy[(1,2,2-trihydroxy-1,2-dioxidodiphosphoranyl)oxy]phosphinyl]-β-D-erythro-pentofuranosyl]-1,2-dihydro-2-oxo-5-pyrimidinyl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

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

[[3-[4-Amino-7-[2-deoxy-5-O-[hydroxy[(1,2,2-trihydroxy-1,2-dioxidodiphosphoranyl)oxy]phosphinyl]-β-D-erythro-pentofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

[[3-[1-(2-Deoxy-β-D-erythro-pentofuranosyl)-1,2,3,4-tetrahydro-2,4-dioxo-5-pyrimidinyl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

[[3-[4-Amino-1-(2-deoxy-β-D-erythro-pentofuranosyl)-1,2-dihydro-2-oxo-5-pyrimidinyl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate