Guanosine, (R)-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-methyl-2′-O-methyl-N-(2-methyl-1-oxopropyl)guanylyl-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-N-(2-methyl-1-oxopropyl)-

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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