6-Chloro-9-[(2R)-3,5-di-O-benzoyl-2-deoxy-2-fluoro-2-methyl-α-D-erythro-pentofuranosyl]-9H-purine

5-Ethynyl-7-(2-C-ethynyl-4-C-fluoro-β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine

4-Amino-7-(2-C-ethynyl-4-C-fluoro-β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidine-5-carboxamide

4-Amino-7-(2-C-ethynyl-4-C-fluoro-β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidine-5-carbonitrile

4-Amino-7-[3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-C-ethynyl-4-C-fluoro-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine-5-carbonitrile

1,3-Bis(1,1-dimethylethyl) 2-[5-cyano-7-[3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-C-ethynyl-4-C-fluoro-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[5-cyano-7-[5-deoxy-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-C-ethynyl-4-C-fluoro-5-iodo-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[5-cyano-7-(5-deoxy-2-C-ethynyl-4-C-fluoro-5-iodo-β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate