N-[(Cyclopentyloxy)carbonyl]-2′-deoxy-3′,5′-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2′,2′-difluorocytidine

N-(4-Chloro-5-iodo-7H-pyrrolo[2,3-d]pyrimidin-2-yl)-2-methyl-N-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)propanamide

N-(5-Bromo-4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-yl)-2-methyl-N-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)propanamide

N-(4-Chloro-7H-pyrrolo[2,3-d]pyrimidin-2-yl)-2-methyl-N-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)propanamide

N-[4-Chloro-7-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-2-yl]-2,2-dimethylpropanamide

4′-Chloro-7-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-4,7′-bi-7H-pyrrolo[2,3-d]pyrimidine

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-3-deoxy-β-D-erythro-pentofuranosyl]-5-methyl-4-(1H-1,2,4-triazol-1-yl)-2(1H)-pyrimidinone