1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-7-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[2-ethoxy-1-(ethoxycarbonyl)-1-[[4-(methoxycarbonyl)phenyl]methyl]-2-oxoethyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

2-Chloro-7-[2-deoxy-5-O-(1,1-dicarboxy-2-phenylethyl)-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Chloro-7-[2-deoxy-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-7-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-7-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-7-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-7-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[(1,1-dimethylethyl)diphenylsilyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

2-Chloro-7-[2-deoxy-5-O-[(1,1-dimethylethyl)diphenylsilyl]-2-fluoro-β-D-arabinofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Chloro-7-(2-deoxy-2-fluoro-β-D-arabinofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine

7-(5-O-Benzoyl-2-deoxy-2-fluoro-β-D-arabinofuranosyl)-2-chloro-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Chloro-7-(3,5-di-O-benzoyl-2-deoxy-2-fluoro-β-D-arabinofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Chloro-9-[2-chloro-2-deoxy-5-O-(1,1-dicarboxy-2-phenylethyl)-β-D-arabinofuranosyl]-9H-purin-6-amine

2-Chloro-9-[2-chloro-2-deoxy-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]-β-D-arabinofuranosyl]-9H-purin-6-amine

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[2-chloro-2-deoxy-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]-β-D-arabinofuranosyl]-9H-purin-6-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[2-chloro-2-deoxy-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-β-D-arabinofuranosyl]-9H-purin-6-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-(2-chloro-2-deoxy-β-D-arabinofuranosyl)-9H-purin-6-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[2-chloro-2-deoxy-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-arabinofuranosyl]-9H-purin-6-yl]imidodicarbonate

2-Chloro-3'-deoxy-5'-O-(1,1-dicarboxy-2-phenylethyl)-3'-fluoroadenosine

2-Chloro-3'-deoxy-5'-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]-3'-fluoroadenosine

2-Chloro-3'-deoxy-2'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]-3'-fluoroadenosine