5-Bromo-5'-(butylamino)-2',5'-dideoxy-2',2'-difluorocytidine

5'-(Cyclohexylamino)-2',5'-dideoxy-2',2'-difluorocytidine

2'-Deoxy-5'-O-[(1,1-dimethylethyl)dimethylsilyl]-2',2',5-trifluorocytidine

5'-(Butylamino)-2',5'-dideoxy-2',2',5-trifluorocytidine

5'-[(Cyclohexylmethyl)amino]-2',5'-dideoxy-2',2'-difluorocytidine

5'-[(Cyclopropylmethyl)amino]-2',5'-dideoxy-2',2'-difluorocytidine

2',5'-Dideoxy-5'-[[1-(ethoxycarbonyl)propyl]amino]-2',2'-difluorocytidine

2',5'-Dideoxy-5'-[(2-ethylbutyl)amino]-2',2'-difluorocytidine

2',5'-Dideoxy-5'-[(3,3-dimethylbutyl)amino]-2',2'-difluorocytidine

5'-(Butylamino)-2',5'-dideoxy-2',2'-difluorocytidine

2',5'-Dideoxy-N-[2-(dimethylamino)ethyl]-5'-[[2-(dimethylamino)ethyl]amino]-2',2'-difluorocytidine

5'-[(2-Amino-2-oxoethyl)amino]-2',5'-dideoxy-2',2'-difluorocytidine

5'-[Bis(2-methoxyethyl)amino]-2',5'-dideoxy-2',2'-difluorocytidine

2',5'-Dideoxy-5'-[[2-(dimethylamino)ethyl]amino]-2',2'-difluorocytidine

2',5'-Dideoxy-5'-[(2-ethoxyethyl)amino]-2',2'-difluorocytidine

2'-Deoxy-5'-O-[(1,1-dimethylethyl)dimethylsilyl]-2',2'-difluorocytidine

N-(3,4-Dichlorophenyl)-2-methyladenosine

5'-O-[(2S)-6,8-Bis(1,1-dimethylethyl)-5-fluoro-2-oxido-4H-1,3,2-benzodioxaphosphorin-2-yl]-3'-deoxy-3'-fluorothymidine

5'-O-[(2R)-6,8-Bis(5'-O-[(2R)-6,8-Bis(1,1-dimethylethyl)-5-fluoro-2-oxido-4H-1,3,2-benzodioxaphosphorin-2-yl]-3'-deoxy-3'-fluorothymidine1,1-dimethylethyl)-5-fluoro-2-oxido-4H-1,3,2-benzodioxaphosphorin-2-yl]-3'-deoxy-3'-fluorothymidine

5'-O-[6,8-Bis(1,1-dimethylethyl)-5-fluoro-2-oxido-4H-1,3,2-benzodioxaphosphorin-2-yl]-2',3'-dideoxy-3'-fluoro-5-iodouridine