4'-C-1-Buten-1-yl-2'-deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2'-fluorouridine

4'-C-(2-Chloroethenyl)-2'-deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2'-fluorouridine

4'-C-1-Buten-1-yl-2'-deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2'-fluorocytidine

2'-Deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2'-fluoro-4'-C-(3-methyl-1-buten-1-yl)cytidine

2'-Deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2'-fluoro-4'-C-(3-methyl-1-buten-1-yl)uridine

Uridine,4'-C-(cyanomethyl)-5-methyl-3',5'-bis-O-(phenylmethyl)-,2'-acetate

N-[[P(S)]-2'-Deoxy-4'-C-ethenyl-2'-fluoro-P-phenyl-5'-uridylyl]-L-alanine-methylethylester

2'-Deoxy-4'-C-ethenyl-2'-fluoro-N-[(4-methoxyphenyl)diphenylmethyl]guanosine

N-[[P(R)]-2'-Deoxy-4'-C-ethenyl-2'-fluoro-P-phenyl-5'-uridylyl]-L-alanine-methylethylester

N-(2'-Deoxy-4'-C-ethenyl-2'-fluoro-P-phenyl-5'-cytidylyl)-L-alanine-methylethylester

2'-Deoxy-4'-C-ethenyl-2',2'-difluoro-N-[(4-methoxyphenyl)diphenylmethyl]guanosine

2'-Deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-4'-C-ethenyl-2'-fluoro-N-[(4-methoxyphenyl)diphenylmethyl]adenosine

2'-Deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-4'-C-ethenyl-2'-fluoro-N-[(4-methoxyphenyl)diphenylmethyl]guanosine

2'-Deoxy-4'-C-ethenyl-2'-fluoro-N-[(4-methoxyphenyl)diphenylmethyl]-3'-O-[(4-methoxyphenyl)diphenylmethyl]guanosine

2'-Deoxy-4'-C-ethenyl-2',2'-difluorouridine

2'-Deoxy-4'-C-ethenyl-2',2'-difluorocytidine

2',3'-O-Cyclopentylidene-4'-C-ethenylcytidine

4'-C-(2-Chloroethenyl)-2'-deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2'-fluoro-N-[(4-methoxyphenyl)diphenylmethyl]guanosine

5'-Guanylicacid,2'-deoxy-4'-C-ethenyl-2'-fluoro-N-[(4-methoxyphenyl)diphenylmethyl]-3'-O-[(4-methoxyphenyl)diphenylmethyl]-,bis[(2,2-dimethyl-1-oxopropoxy)methyl]ester,6-[bis[(2,2-dimethyl-1-oxopropoxy)methyl]phosphate]

2'-Deoxy-3'-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-4'-C-ethenyl-2',2'-difluorocytidine