2'-O-[2-[[[2-(Dimethylamino)ethyl]amino]oxy]ethyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyluridine

3'-Azido-2',3'-dideoxy-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2-thiouridine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-2'-[methyl(1-pyrenylmethyl)amino]-2-thiouridine

6-S-(2-Cyanoethyl)-2'-deoxy-3',5'-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-N-(2-phenoxyacetyl)-6-thioguanosine

3',5'-O-[Bis(1,1-dimethylethyl)silylene]-2'-chloro-2'-deoxy-5-methyluridine

3',5'-O-(Diethylsilylene)-5-methyluridine

Glycine, N-(1-oxo-2-propylpentyl)-, 5'-ester with 5-fluorouridine

2'-O-[2-[(Aminocarbonyl)amino]cyclohexyl]-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-5-methyluridine

3'-O-(2-Methoxycyclohexyl)-5-methyluridine

2'-O-(2-Methoxycyclohexyl)-5-methyluridine

2'-Deoxy-4'-C-ethyl-5-iodouridine

2'-Deoxy-5-iodo-4'-C-methyluridine

5'-O-[(1,1-Dimethylethyl)dimethylsilyl]-8-methyladenosine

Benzimidazole, 5,6-dichloro-1-ribofuranosyl-

2'-Deoxy-3',5'-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-4'-C-ethyl-5-iodouridine

2'-Deoxy-3',5'-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-5-iodo-4'-C-methyluridine

2'-Deoxy-5-iodo-4'-C-methylcytidine

2'-Deoxy-3',5'-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-4'-C-ethyl-5-iodocytidine

2'-Deoxy-3',5'-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-5-iodo-4'-C-methylcytidine

4-S-[2-[[4-[(2-Bromoacetyl)amino]phenyl]amino]-2-oxoethyl]-4-thiouridine