Uridine, [P(R)]-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-methyl-2′-O-methyluridylyl-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyl-N-(2-methyl-1-oxopropyl)-, 3′-(S-methyl methylphosphonothioate)

Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyl-, 3′-(S-methyl methylphosphonothioate)

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-(P-methyl-N-phenylphosphonamidothioate)

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-(S-methyl methylphosphonothioate)

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyl-N-(2-methyl-1-oxopropyl)-, 3′-(S-methyl methylphosphonothioate)

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-(S-methyl P-methylphosphonothioate)

Guanosine, (S)-N-benzoyl-P,2′-dideoxy-P-methylcytidylyl-(3′→5′)-(S)-N-benzoyl-P,2′-dideoxy-P-methylcytidylyl-(3′→5′)-(S)-P-deoxy-P-methylthymidylyl-(3′→5′)-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-acetate

Guanosine, (R)-N-benzoyl-P,2′-dideoxy-P-methylcytidylyl-(3′→5′)-(R)-N-benzoyl-P,2′-dideoxy-P-methylcytidylyl-(3′→5′)-(R)-P-deoxy-P-methylthymidylyl-(3′→5′)-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-acetate

Guanosine, (S)-N-benzoyl-P,2′-dideoxy-P-methylcytidylyl-(3′→5′)-(S)-P-deoxy-P-methylthymidylyl-(3′→5′)-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-acetate

Guanosine, (R)-N-benzoyl-P,2′-dideoxy-P-methylcytidylyl-(3′→5′)-(R)-P-deoxy-P-methylthymidylyl-(3′→5′)-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-acetate

Guanosine, (S)-N-benzoyl-P,2′-dideoxy-P-methylcytidylyl-(3′→5′)-(R)-N-benzoyl-P,2′-dideoxy-P-methylcytidylyl-(3′→5′)-(R)-P-deoxy-P-methylthymidylyl-(3′→5′)-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-acetate

Guanosine, (R)-P-deoxy-P-methylthymidylyl-(3′→5′)-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-acetate

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyl-N-(2-methyl-1-oxopropyl)-, 3′-(P-methyl-N-phenylphosphonamidate)

Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyl-, 3′-(P-methyl-N-phenylphosphonamidate)

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyl-, 3′-(P-methyl-N-phenylphosphonamidothioate)

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyl-, 3′-(S-methyl methylphosphonothioate)

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-(2-methyl-1-oxopropyl)-, 3′-(P-methyl-N-phenylphosphonamidothioate)

Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-, 3′-(P-methyl-N-phenylphosphonamidothioate)

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-, 3′-(P-methyl-N-phenylphosphonamidothioate)