3′-Azido-3′-deoxy-3-(1,1-dimethylethyl)-5′-O-(1,1-dimethylethyl)thymidine

3′-Azido-3′-deoxy-5′-O-(2-methylpropyl)thymidine

3′-Azido-3′-deoxy-3-(2-methylpropyl)-5′-O-(2-methylpropyl)thymidine

5′-O-Butyl-3′-azido-3′-deoxythymidine

3-Butyl-5′-O-butyl-3′-azido-3′-deoxythymidine

3′-Azido-3′-deoxy-5′-O-propylthymidine

3′-Azido-3′-deoxy-3-propyl-5′-O-propylthymidine

3′-Azido-3′-deoxy-5′-O-ethylthymidine

3′-Azido-3′-deoxy-3-ethyl-5′-O-ethylthymidine

3′-Azido-3′-deoxy-3-methyl-5′-O-methylthymidine

Uridine, 2′-deoxy-5-fluoro-, 3′-benzoate

Cytidine, 5′-O-acetyl-P(S)-(4-chlorophenyl)-P-thiothymidylyl-(3′→5′)-P(S)-(2-cyanoethyl)-2′-deoxy-6-O-(2,5-dichlorophenyl)-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-N-benzoyl-P(S)-(4-chlorophenyl)-2′-deoxy-P-thioadenylyl-(3′→5′)-N-benzoyl-2′-deoxy-, 3′-(4-oxopentanoate)

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

Guanosine, 3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-5′-O-(methyleneamino)-N-(2-methyl-1-oxopropyl)-

Guanosine, 3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-5′-O-(methyleneamino)-

Adenosine, N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-5′-O-(methyleneamino)-

Guanosine, 5′-O-amino-N-[(dimethylamino)methylene]-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-

Adenosine, 5′-O-amino-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-

Adenosine, 5′-O-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-3′-formyl-5-methyl-2′-O-methyl-