2'-Deoxy-3'-O-(1,3-dihydro-1,3- dioxo-2H-isoindol-2-yl)-Guanosine

N-[16-[(6-Amino-3-acridinyl)amino]-1,13,16-trioxo-3,6,9-trioxa-12-azahexadec-1-yl]-2'-deoxy-2',2'-difluorocytidine

N,N''-[[[5-[[2-[2-[2-[4-[5-(4-Methyl-1-piperazinyl)[2,5'-bi-1H-benzimidazol]-2'-yl]phenoxy]ethoxy]ethoxy]ethyl]amino]-5-oxopentyl]imino]bis[3,1-propanediyldithio(1-oxo-3,1-propanediyl)]]bis[2'-deoxy-2',2'-difluorocytidine]

N-(4-Amino-2-methylbenzoyl)-2'-deoxy-2',2'-difluorocytidine

N-(4-Amino-2-fluorobenzoyl)-2'-deoxy-2',2'-difluorocytidine

N-(4-Amino-2-chlorobN-(4-Amino-2-chlorobenzoyl)-2'-deoxy-2',2'-difluorocytidineenzoyl)-2'-deoxy-2',2'-difluorocytidine

N-(4-Aminobenzoyl)-2'-deoxy-2',2'-difluorocytidine

N-(2-Chloro-4-nitrobeN-(2-Chloro-4-nitrobenzoyl)-2'-deoxy-2',2'-difluorocytidinenzoyl)-2'-deoxy-2',2'-difluorocytidine

N-[2-[3-Chloro-4-(3-oxo-1,2-benzisoselenazol-2(3H)-yl)phenyl]acetyl]-2'-deoxy-2',2'-difluorocytidine

N-[2-Chloro-5-(3-oxo-1,2-benzisoselenazol-2(3H)-yl)benzoyl]-2'-deoxy-2',2'-difluorocytidine

N-[3-(Acetyloxy)-4-(3-oxo-1,2-benzisoselenazol-2(3H)-yl)benzoyl]-2'-deoxy-2',2'-difluorocytidine

N-[2-Chloro-4-(3-oxo-1,2-benzisoselenazol-2(3H)-yl)benzoyl]-2'-deoxy-2',2'-difluorocytidine

2'-C-Fluoroadenosine

(2'R)-2'-Deoxy-2'-ethynyl-2'-fluoroadenosine

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

2'-Deoxy-N-[[(5,7-dimethoxy-2-benzofuranyl)methoxy]carbonyl]-2',2'-difluorocytidine

N-[(2-Benzofuranylmethoxy)carbonyl]-2'-deoxy-2',2'-difluorocytidine

2',3'-O-Bicyclo[2.2.1]hept-2-ylidene-5-fluorouridine

2',3'-O-[(1S)-4-Ethoxy-1-methyl-4-oxobutylidene]-5-fluorouridine

2',3'-O-[(1R)-4-Ethoxy-1-methyl-4-oxobutylidene]-5-fluorouridine