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

5-Bromo-5'-O-methyluridine

2'-O-[(1R,2R)-2-[(Aminocarbonyl)amino]cyclohexyl]-5-methyluridine

N-Benzoyl-2'-C-fluoroadenosine

N-Benzoyl-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-C-fluoroadenosine

8-Cyano-N,N-dimethyladenosine

3',5'-Dideoxy-5'-iodouridine

N-Benzoyl-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-3'-[(4-carboxy-2,2,3,3,4,4-hexafluoro-1-oxobutyl)amino]-2',3'-dideoxycytidine

N-Benzoyl-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-3'-[(4-carboxy-2,2,3,3,4,4-hexafluoro-1-oxobutyl)amino]-2',3'-dideoxyadenosine

5'-[[(2Z)-4-Amino-2-buten-1-yl]methylamino]-5'-deoxy-2-methyladenosine

5'-[[(2Z)-4-Amino-2-buten-1-yl]methylamino]-5'-deoxy-8-methyladenosine

5'-[[(2Z)-4-Amino-2-buten-1-yl]methylamino]-2',5'-dideoxy-2'-fluoroadenosine

5'-Deoxy-5'-[[(2Z)-4-[[(1,1-dimethylethoxy)carbonyl]amino]-2-buten-1-yl]methylamino]-8-methyladenosine

5'-Chloro-5'-deoxy-8-methyladenosine

(1'ξ)-5-Methyluridine

4'-C-(Hydroxymethyl)-5-methyl-3',5'-bis-O-(phenylmethyl)-2-thiouridine

5'-Deoxy-2',3'-O-(diphenylmethylene)-5-fluorocytidine

2',3'-O-[(3-Chlorophenyl)methylene]-5'-deoxy-5-fluorocytidine

5'-Deoxy-2',3'-O-(diphenylmethylene)-5-fluorouridine

2',3'-O-[(3-Chlorophenyl)methylene]-5'-deoxy-5-fluorouridine