5'-S-[(4-Methoxyphenyl)diphenylmethyl]-2',3'-O-(1-methylethylidene)-N-(2-methyl-1-oxopropyl)-8-[[(methylsulfonyl)oxy]methyl]-6-O-[2-(4-nitrophenyl)ethyl]-5'-thioguanosine

8-(Hydroxymethyl)-5'-S-[(4-methoxyphenyl)diphenylmethyl]-2',3'-O-(1-methylethylidene)-N-(2-methyl-1-oxopropyl)-6-O-[2-(4-nitrophenyl)ethyl]-5'-thioguanosine

8-(Hydroxymethyl)-5'-S-[(4-methoxyphenyl)diphenylmethyl]-2',3'-O-(1-methylethylidene)-N-(2-methyl-1-oxopropyl)-5'-thioguanosine

5'-S-[(4-Methoxyphenyl)diphenylmethyl]-2',3'-O-(1-methylethylidene)-N-(2-methyl-1-oxopropyl)-5'-thioguanosine

5,6-Dimethyl 1-β-D-ribofuranosyl-1H-benzimidazole-5,6-dicarboxylate

2',3'-Dideoxy-3'-fluoro-5-iodocytidine

5-Iodo-4-thiouridine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-3'-[(2-carboxyethyl)dithio]-2',3'-dideoxyuridine

3'-[(2-Aminoethyl)dithio]-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2',3'-dideoxyuridine

(2'R)-2',3'-Dideoxy-2'-fluoro-2'-methylcytidine

2'-Deoxy-2',2'-difluoro-4'-C-methylcytidine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-2'-O-(2-methoxyphenyl)-5-methyluridine

5-(31-Azido-5-oxo-8,11,14,17,20,23,26,29-octaoxa-4-azahentriacont-1-yn-1-yl)-2',3'-dideoxyuridine 5'-(tetrahydrogen triphosphate)

5-(19-Azido-5-oxo-8,11,14,17-tetraoxa-4-azanonadec-1-en-1-yl)-2'-deoxyuridine 5'-(tetrahydrogen triphosphate)

5-(2-Benzofuranyl)-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxyuridine

5'-S-(Carboxymethyl)-3'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2'-O-methyl-5'-thiouridine

3'-O-[(1,1-Dimethylethyl)diphenylsilyl]-5'-S-(2-ethoxy-2-oxoethyl)-5-methyl-2'-O-methyl-5'-thiouridine

5,6-Dimethyl 1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-1H-benzimidazole-5,6-dicarboxylate

5-(5-Azido-1-pentyn-1-yl)-2'-deoxyuridine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-4-O-(4-chlorophenyl)-2'-O-methyluridine