Cytidine, N-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′,2′-difluoro-3′,5′-bis-O-(trimethylsilyl)-, cyclic 3′,5′-[[P(S)]-N-[(1R)-1-methyl-2-(2-methyl-1-oxopropoxy)ethyl]phosphoramidate]

Cytidine, N-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′,2′-difluoro-3′,5′-bis-O-(trimethylsilyl)-, cyclic 3′,5′-[[P(R)]-N-[(1R)-1-methyl-2-(2-methyl-1-oxopropoxy)ethyl]phosphoramidate]

L-Alanine, N-(S)-phosphono-, 1-(1-methylethyl) ester, cyclic (P→3′,5′)-ester with N-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′,2′-difluorocytidine

L-Alanine, N-(R)-phosphono-, 1-(1-methylethyl) ester, cyclic (P→3′,5′)-ester with N-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′,2′-difluorocytidine

N-(2-Furanylmethyl)-3-β-D-ribofuranosyl-3H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazin-9-amine

N-(Phenylmethyl)-3-β-D-ribofuranosyl-3H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazin-9-amine

N-(3-Methyl-2-buten-1-yl)-3-β-D-ribofuranosyl-3H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazin-9-amine

N-(3-Methylbutyl)-3-β-D-ribofuranosyl-3H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazin-9-amine

N-Butyl-3-β-D-ribofuranosyl-3H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazin-9-amine

9-Chloro-3-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-3H-imidazo[4′,5′:5,6]pyrido[2,3-b]pyrazine