Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-(6-methyl-2-pyridinyl)thymidylyl-(3′→5′)-3′-O-[bis(4-methoxyphenyl)phenylmethyl]-

Cytidine, N-[3-[[4-[(3-aminopropyl)amino]butyl]amino]propyl]-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

Adenosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-N-[3-[[4-[(trifluoroacetyl)[3-[(trifluoroacetyl)amino]propyl]amino]butyl]amino]propyl]-2′-deoxy-

1-[(2S,4S,5R,6S)-4,6-Bis[(triethylsilyl)oxy]-1-oxaspiro[4.4]non-2-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(2R,4S,5R,6S)-4,6-Bis[(triethylsilyl)oxy]-1-oxaspiro[4.4]non-2-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

(2S,3R,5R,11R)-2,3-Dihydro-8-methyl-11-(triphenylmethoxy)-3-[(triphenylmethoxy)methyl]-2,5-methano-5H,9H-pyrimido[2,1-b][1,5,3]dioxazepin-9-one

Uridine, 2′-O-(1-ethoxyethyl)uridylyl-(3′→5′)-2′,3′-O-(1-ethoxyethylidene)-

Uridine, 2′,3′-dideoxy-3′-[(diethoxyphosphinothioyl)difluoromethyl]-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-fluoro-

Uridine, 2′,3′-dideoxy-3′-[(diethoxyphosphinothioyl)difluoromethyl]-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-

Thymidine, 3′-deoxy-3′-[(diethoxyphosphinyl)difluoromethyl]-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-

3-[2,3-Dideoxy-3-[(diethoxyphosphinothioyl)difluoromethyl]-5-O-[(1,1-dimethylethyl)diphenylsilyl]-α-D-erythro-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

Thymidine, 3′-deoxy-3′-[(diethoxyphosphinothioyl)difluoromethyl]-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-

3-[2,3-Dideoxy-3-[(diethoxyphosphinyl)difluoromethyl]-5-O-[(1,1-dimethylethyl)diphenylsilyl]-α-D-erythro-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

Cytidine, uridylyl-(3′→5′)-5-methyl-2′,3′-O-(1-methylethylidene)-

Uridine, 3′-benzeneacetate 5′-formate

Adenosine, 2′,3′-O-(ethoxymethylene)-, 5′-sulfamate

Uridine, 2′,3′-O-(1-methoxy-2-phenylethylidene)-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-2-pyridinyl-P-thiothymidylyl-(3′→5′)-3′-O-[bis(4-methoxyphenyl)phenylmethyl]-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-2-pyridinylthymidylyl-(3′→5′)-3′-O-[bis(4-methoxyphenyl)phenylmethyl]-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-[3′-O-[bis(4-methoxyphenyl)phenylmethyl]-5′-deoxythymidin-5′-yl]-P-thiothymidylyl-(3′→5′)-3′-O-[bis(4-methoxyphenyl)phenylmethyl]-