Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methylcytidylylmethylene(methylimino)-(3′→5′)-N-benzoyl-2′-O-methyl-

Uridine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethylene(methylimino)-(3′→5′)-5-methyl-2′-O-methyl-

Guanosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethylene(methylimino)-(3′→5′)-2′-O-methyl-N-(2-methyl-1-oxopropyl)-

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethylene(methylimino)-(3′→5′)-N-benzoyl-5-methyl-2′-O-methyl-

Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethylene(methylimino)-(3′→5′)-N-benzoyl-2′-O-methyl-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methyluridylylmethylene(methylimino)-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methyluridylylmethylene(methylimino)-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-N-(2-methyl-1-oxopropyl)-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methyluridylylmethylene(methylimino)-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Adenosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methyluridylylmethylene(methylimino)-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyl-N-(2-methyl-1-oxopropyl)guanylylmethylene(methylimino)-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-N-(2-methyl-1-oxopropyl)-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyl-N-(2-methyl-1-oxopropyl)guanylylmethylene(methylimino)-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Adenosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyl-N-(2-methyl-1-oxopropyl)guanylylmethylene(methylimino)-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-

Uridine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methylcytidylylmethylene(methylimino)-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Guanosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methylcytidylylmethylene(methylimino)-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-N-(2-methyl-1-oxopropyl)-

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methylcytidylylmethylene(methylimino)-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methylcytidylylmethylene(methylimino)-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-

Uridine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethylene(methylimino)-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Guanosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethylene(methylimino)-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-N-(2-methyl-1-oxopropyl)-

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethylene(methylimino)-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethylene(methylimino)-(3′→5′)-N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-