N-Benzoyl-2'-deoxy-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2',2'-difluorocytidine

2'-Deoxy-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-fluorouridine

8-[[(3,4-Dichlorophenyl)methyl]amino]-5'-O-methyladenosine

2'-O-[(1,1-Dimethylethyl)dimethylsilyl]-3'-O-methyluridine

3'-[[(2R,3R)-2-Amino-3-fluoro-1-oxo-3-phenylpropyl]amino]-3'-deoxy-N,N-dimethyladenosine

3'-Deoxy-3'-[[(2R,3R)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-3-fluoro-1-oxo-3-phenylpropyl]amino]-N,N-dimethyladenosine

3'-[(3S)-3-Amino-2-oxo-4-phenylbutyl]-3'-deoxy-N,N-dimethyladenosine

1-[2-O-[[[[4-[2-(2-Pyrenyl)ethynyl]phenyl]methyl]amino]carbonyl]-β-D-arabinofuranosyl]-2,4(1H,3H)-pyrimidinedione

2'-Deoxy-3,4,5,6-tetrahydro-4-O-methyluridine

5'-Guanylic acid, 3'-ester with 5-methyluridine

5-Chloro-5'-deoxy-5'-fluorouridine

2-Amino-5'-deoxy-5'-fluoroadenosine

3'-[[(2R,3S)-2-Amino-3-fluoro-1-oxo-3-phenylpropyl]amino]-3'-deoxy-N,N-dimethyladenosine

3'-[[(2S)-2-Amino-3-(3,4-difluorophenyl)-1-oxopropyl]amino]-3'-deoxy-N,N-dimethyladenosine

3'-[[(2S)-2-Amino-3-(3,4-dichlorophenyl)-1-oxopropyl]amino]-3'-deoxy-N,N-dimethyladenosine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-3'-deoxy-3'-[[(2S)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-1-oxo-3-[4-(trifluoromethyl)phenyl]propyl]amino]-N,N-dimethyladenosine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-3'-deoxy-3'-[[(2S)-3-[4-[[(1,1-dimethylethoxy)carbonyl]amino]phenyl]-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-1-oxopropyl]amino]-N,N-dimethyladenosine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-3'-deoxy-3'-[[(2S)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-3-(4-methylphenyl)-1-oxopropyl]amino]-N,N-dimethyladenosine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-3'-deoxy-3'-[[(2S)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-1-oxo-3-(2,3,4,5,6-pentafluorophenyl)propyl]amino]-N,N-dimethyladenosine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-3'-deoxy-3'-[[(2S)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-1-oxo-3-[2-(trifluoromethyl)phenyl]propyl]amino]-N,N-dimethyladenosine