Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-(2-cyanoethyl)-P-deoxo-2′-O-(2-methoxyethyl)-N-(2-methyl-1-oxopropyl)guanylyl-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-

Cytidine, P(O)-(2-cyanoethyl)-2′-O-(2-methoxyethyl)-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→N)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-(2-cyanoethyl)-2′-O-(2-methoxyethyl)-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→N)-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-(2-cyanoethyl)-P-deoxo-2′-O-(2-methoxyethyl)-N-(2-methyl-1-oxopropyl)guanylyl-(3′→N)-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-(2-cyanoethyl)-P-deoxo-2′-deoxy-5-methylcytidylyl-(3′→5′)-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-

Cytidine, 2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-

Cytidine, 5′-O-[(1,1-dimethylethyl)diphenylsilyl]-P-thiothymidylyl-(3′→5′)-N-benzoyl-2′-deoxy-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-(2-methoxyethyl)-5-methyl-P-thiouridylyl-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-

Cytidine, P(O)-(2-cyanoethyl)-2′-deoxy-P-thiothymidylyl-(3′→5′)-N-benzoyl-2′-deoxy-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-

Cytidine, N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-, 5′-(2,2,2-trifluoroacetate)

Cytidine, N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-, 5′-(2,2,2-trichloroacetate)

Cytidine, N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-, 5′-(2,2-dichloroacetate)

Cytidine, 3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-

Uridine, 3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-(2-methoxyethyl)-5-methyl-5′-O-(triethylsilyl)-

Uridine, P(O)-(2-cyanoethyl)-2′-O-(2-methoxyethyl)-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-2′-O-(2-methoxyethyl)-5-methyl-