Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-2′-[(phenylmethoxy)amino]-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-2′-(methoxyamino)-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-2′-[(phenylmethoxy)amino]-

1-[(3aR,4R,6R,6aS)-6-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]hexahydro-3-methoxy-2-oxofuro[3,4-d]oxazol-4-yl]-2,4(1H,3H)-pyrimidinedione

1-[(3aR,4R,6R,6aS)-6-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]hexahydro-2-oxo-3-(phenylmethoxy)furo[3,4-d]oxazol-4-yl]-2,4(1H,3H)-pyrimidinedione

Ethyl 3-[9-[5-O-(diethoxyphosphinyl)-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-9H-purin-6-yl]-α-fluorobenzeneacetate

9-[5-O-(Diethoxyphosphinyl)-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-6-[3-(1,1-dimethylethyl)phenyl]-9H-purine

9-[5-O-(Dimethoxyphosphinyl)-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-6-[3-(1,1-dimethylethyl)phenyl]-9H-purine

6-[3-(1,1-Dimethylethyl)phenyl]-9-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-9H-purine

Guanosine 5'-(pentahydrogen tetraphosphate), P'''-ester with 2',3'-dideoxyadenosine

3′-O-[(2-Nitrophenyl)methyl]thymidine 5′-(tetrahydrogen triphosphate)

Phosphoramidous acid, bis(1-methylethyl)-, (1R,3R,4R,7S)-1-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-5-methyl-2-oxa-5-azabicyclo[2.2.1]hept-7-yl 2-cyanoethyl ester

1-[(1R,3R,4R,7S)-1-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-7-hydroxy-5-methyl-2-oxa-5-azabicyclo[2.2.1]hept-3-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(1R,3R,4R,7S)-7-Hydroxy-1-(hydroxymethyl)-5-methyl-2-oxa-5-azabicyclo[2.2.1]hept-3-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

2,4(1H,3H)-Pyrimidinedione, 5-methyl-1-[(6aR,9R,9aS,10R)-tetrahydro-8-methyl-2,2,4,4-tetrakis(1-methylethyl)-6H-6a,9-(epoxymethano)-1,3,5,2,4-trioxadisilocino[6,7-c]pyrrol-10-yl]-

2,4(1H,3H)-Pyrimidinedione, 5-methyl-1-[(6aR,9R,9aS,10R)-tetrahydro-2,2,4,4-tetrakis(1-methylethyl)-6H-6a,9-(epoxymethano)-1,3,5,2,4-trioxadisilocino[6,7-c]pyrrol-10-yl]-

Phosphoramidous acid, bis(1-methylethyl)-, (1R,3R,4R,7S)-1-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-5-(trifluoroacetyl)-2-oxa-5-azabicyclo[2.2.1]hept-7-yl 2-cyanoethyl ester

1-[(1R,3R,4R,7S)-1-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-7-hydroxy-5-(2,2,2-trifluoroacetyl)-2-oxa-5-azabicyclo[2.2.1]hept-3-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione