[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′,6′-dideoxy-2′-fluoro-β-D-allofuranoadenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-[2-(methylamino)-2-oxoethyl]-β-D-allofuranoadenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-(2-methoxyethyl)-β-D-allofuranoadenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-methyl-β-D-allofuranoadenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoroadenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-O-[2-(methylamino)-2-oxoethyl]adenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-O-(2-methoxyethyl)adenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyladenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′,6′-dideoxy-2′-fluoro-β-D-altrofuranoadenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′,6′-dideoxy-2′-fluoro-α-L-galactofuranoadenylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′,6′-dideoxy-2′-fluoro-α-L-talofuranocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-[2-(methylamino)-2-oxoethyl]-α-L-talofuranocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-(2-methoxyethyl)-α-L-talofuranocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-methyl-α-L-talofuranocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′,6′-dideoxy-2′-fluoro-β-D-allofuranocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-[2-(methylamino)-2-oxoethyl]-β-D-allofuranocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-(2-methoxyethyl)-β-D-allofuranocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-6′-deoxy-2′-O-methyl-β-D-allofuranocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluorocytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-O-[2-(methylamino)-2-oxoethyl]cytidylyl-(3′→5′-7′)-6′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribo-heptofuranothymidine