4-(2,3-Di-O-acetyl-β-D-ribofuranosyl)-3,4-dihydro-3-oxo-2-pyrazinecarboxamide

4-[2,3-Di-O-acetyl-5-O-[bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-3,4-dihydro-3-oxo-2-pyrazinecarboxamide

3,4-Dihydro-4-[2,3-O-[(4-methoxyphenyl)methylene]-β-D-ribofuranosyl]-3-oxo-2-pyrazinecarboxamide

6-Fluoro-3,4-dihydro-4-[5-O-[1-hydroxy-1,3-dioxido-5-[4-[(1-oxopentadecyl)oxy]phenyl]-3-[[4-[(1-oxopentyl)oxy]phenyl]methoxy]-2,4-dioxa-1,3-diphosphapent-1-yl]-β-D-ribofuranosyl]-3-oxo-2-pyrazinecarboxamide

6-Bromo-3,4-dihydro-3-oxo-4-(5-O-phosphono-β-D-ribofuranosyl)-2-pyrazinecarboxamide

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