1,4,7-Tri(1,1-dimethylethyl) 10-[6-[[1-(6-amino-9H-purin-9-yl)-1-deoxy-2,3-O-(1-methylethylidene)-β-D-ribofuranuronoyl]amino]-1-oxohexyl]-1,4,7,10-tetraazacyclododecane-1,4,7-tricarboxylate

1-[3,5-O-[(1S)-3-Azido-1-(diethoxyphosphinyl)propylidene]-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3,5-O-[(1S)-4-(Acetyloxy)-1-(diethoxyphosphinyl)butylidene]-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3,5-O-[(1S)-4-Bromo-1-(diethoxyphosphinyl)butylidene]-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[2-Deoxy-3,5-O-[(1S)-1-(diethoxyphosphinyl)-3-hydroxypropylidene]-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[2-Deoxy-3,5-O-[(1S)-1-(diethoxyphosphinyl)-3-[[(1,1-dimethylethyl)diphenylsilyl]oxy]propylidene]-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3,5-O-[(1S)-3-(Benzoyloxy)-1-(diethoxyphosphinyl)propylidene]-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[2-Deoxy-3,5-O-[(1S)-1-(diethoxyphosphinyl)-2-[[(phenylmethoxy)carbonyl]amino]ethylidene]-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3,5-O-[(1S)-2-Chloro-1-(diethoxyphosphinyl)ethylidene]-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3,5-O-[(1S)-2-Bromo-1-(diethoxyphosphinyl)ethylidene]-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

2,4(1H,3H)-Pyrimidinedione, 1-[3,5-O-[4-(acetyloxy)-1-methoxybutylidene]-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

2,4(1H,3H)-Pyrimidinedione, 1-[3,5-O-(4-bromo-1-methoxybutylidene)-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

2,4(1H,3H)-Pyrimidinedione, 1-[2-deoxy-3,5-O-[3-[[(1,1-dimethylethyl)diphenylsilyl]oxy]-1-methoxypropylidene]-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

2,4(1H,3H)-Pyrimidinedione, 1-[2-deoxy-3,5-O-(3-hydroxy-1-methoxypropylidene)-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

2,4(1H,3H)-Pyrimidinedione, 1-[3,5-O-[3-(benzoyloxy)-1-methoxypropylidene]-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

2,4(1H,3H)-Pyrimidinedione, 1-[2-deoxy-3,5-O-[1-ethoxy-2-[[(phenylmethoxy)carbonyl]amino]ethylidene]-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

2,4(1H,3H)-Pyrimidinedione, 1-[2-deoxy-3,5-O-(1-ethoxy-2-iodoethylidene)-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

2,4(1H,3H)-Pyrimidinedione, 1-[3,5-O-(2-bromo-1-ethoxyethylidene)-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

2,4(1H,3H)-Pyrimidinedione, 1-[3,5-O-(2-chloro-1-ethoxyethylidene)-2-deoxy-β-D-threo-pentofuranosyl]-5-methyl-, (S)-

Cytidylyl-(3′→5′)-cytidylyl-(3′→5′)-uridylyl-(3′→5′)-cytidylyl-(3′→5′)-cytidine