Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-[(chloromethoxyphosphino)methyl]-3′-deoxy-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-[[[bis(1-methylethyl)amino]methoxyphosphino]methyl]-3′-deoxy-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-[[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]methyl]-2′,3′-dideoxy-5-methyl-N-(1-methyl-2-pyrrolidinylidene)-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-[[chloro(2-cyanoethoxy)phosphino]methyl]-2′,3′-dideoxy-5-methyl-N-(1-methyl-2-pyrrolidinylidene)-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-[[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]methyl]-3′-deoxy-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-[[chloro(2-cyanoethoxy)phosphino]methyl]-3′-deoxy-

Thymidine, 3′-[(chloroethoxyphosphino)methyl]-3′-deoxy-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-[[(2-cyanoethoxy)phosphinyl]methyl]-2′,3′-dideoxy-5-methyl-

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′,3′-dideoxy-3′-[(hydroxyphosphinyl)methyl]-5-methyl-

Cytidine, N-benzoyl-2′,3′-dideoxy-3′-[(ethoxyphosphinyl)methyl]-5-methyl-

Cytidine, N-benzoyl-2′,3′-dideoxy-3′-[[(1,1-diethoxyethyl)ethoxyphosphinyl]methyl]-5-methyl-

Cytidine, N-benzoyl-2′,3′-dideoxy-3′-[[(1,1-diethoxyethyl)ethoxyphosphinyl]methyl]-5′-O-[(1,1-dimethylethyl)dimethylsilyl]-5-methyl-

Cytidine, 2′,3′-dideoxy-3′-[[(1,1-diethoxyethyl)ethoxyphosphinyl]methyl]-5′-O-[(1,1-dimethylethyl)dimethylsilyl]-5-methyl-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-3′-[(methoxyphosphinyl)methyl]-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-[[(2-cyanoethoxy)phosphinyl]methyl]-2′,3′-dideoxy-5-methyl-N-(1-methyl-2-pyrrolidinylidene)-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)thymidylyl(2-oxo-1,2-ethanediyl)imino-(3′→5′)-5′-deoxy-5-methyl-2′-O-[2-[(trifluoroacetyl)amino]ethyl]-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)thymidylyl(2-oxo-1,2-ethanediyl)imino-(3′→5′)-5′-deoxy-5-methyl-2′-O-[2-[(trifluoroacetyl)amino]ethyl]-

Uridine, 3′-de(phosphinicooxy)thymidylyl(2-oxo-1,2-ethanediyl)imino-(3′→5′)-5′-deoxy-5-methyl-2′-O-[2-[(trifluoroacetyl)amino]ethyl]-

Uridine, 3′-de(phosphinicooxy)-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-3-[(phenylmethoxy)methyl]thymidylyl(2-oxo-1,2-ethanediyl)imino-(3′→5′)-5′-deoxy-5-methyl-3-[(phenylmethoxy)methyl]-2′-O-[2-[(trifluoroacetyl)amino]ethyl]-

Thymidine, 3′-(carboxymethyl)-3′-deoxy-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-3-[(phenylmethoxy)methyl]-