2'-Deoxy-4'-C -(difluoromethyl)-2',5-difluoro-5'-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)cytidine

2'-Deoxy-4'-C -(difluoromethyl)-2',5-difluoro-5'-O -(2-sulfido-4H -1,3,2-benzodioxaphosphorin-2-yl)cytidine

5-Chloro-2'-deoxy-4'-C -(difluoromethyl)-2'-fluoro-5'-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)cytidine

5'-Chloro-2'-deoxy-4'-C -(difluoromethyl)-2'-fluoro-5'-O -(2-sulfido-4H -1,3,2-benzodioxaphosphorin-2-yl)cytidine

N -[4'-C -(Difluoromethyl)-P (O )-phenyl-P -thio-5'-cytidylyl]-L-alanine 1-methylethyl ester

Uridine, 5-chloro-3'-deoxy-4'-C -(difluoromethyl)-3',3'-difluoro-, 5'-[O ,O -bis(methoxyphenyl) phosphorothioate]

N ,N '-[2'-Deoxy-4'-C -(difluoromethyl)-2'-fluoro-5'-cytidylylidene]bis[L-alanine] 1,1'-bis(1-methylethyl) ester

L-Alanine, N ,N ′-(hydroxyphosphinothioylidene)bis-, 1,1′-bis(1-methylethyl) ester, 5′-ester with 4-amino-1-[3-deoxy-4-C -(difluoromethyl)-3-fluoro-β-D-xylofuranosyl]-2(1H )-pyrimidinone 1

L-Alanine, N -(hydroxyphenoxyphosphinothioyl)-, 1-methylethyl ester, 5′-ester with1-[3-deoxy-4-C -(difluoromethyl)-3-fluoro-β-Dxylofuranosyl]-2,4(1H ,3H )-pyrimidinedione

N ,N '-[3'-Deoxy-4'-C -(difluoromethyl)-3'-fluoro-P -thio-5'-cytidylylidene]bis[L-alanine] 1,1'-bis(1-methylethyl) ester

N -[3'-Deoxy-4'-C -(difluoromethyl)-3'-fluoro-P(O )-phenyl-P -thio-5'-uridylyl]-L-alanine 1-methylethyl ester

N -[2'-Deoxy-4'-C -(difluoromethyl)-2'-fluoro-P(O )-phenyl-P -thio-5'-uridylyl]-L-alanine 1-methylethyl ester

L-Alanine, N ,N ′-(hydroxyphosphinothioylidene)bis-, 1,1′-bis(1-methylethyl) ester, 5′-ester with 4-amino-1-[2-deoxy-4-C -(difluoromethyl)-2-fluoro-β-D-arabinofuranosyl]-2(1H )-pyrimidinone 1

L-Alanine, N -(hydroxyphenoxyphosphinothioyl)-, 1-methylethyl ester, 5′-ester with1-[2-deoxy-4-C -(difluoromethyl)-2-fluoro-β-Darabinofuranosyl]-2,4(1H ,3H )-pyrimidinedione

N ,N '-[2'-Deoxy-4'-C -(difluoromethyl)-2'-fluoro-P -thio-5'-cytidylylidene]bis[L-alanine] 1,1'-bis(1-methylethyl) ester

2-Amino-9-[4-C -(difluoromethyl)-5-O -(2-sulfido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-xylofuranosyl]-1,9-dihydro-6H -purin-6-one

2-Amino-9-[4-C -(difluoromethyl)-5-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-xylofuranosyl]-1,9-dihydro-6H -purin-6-one

2-Amino-9-[4-C -(difluoromethyl)-5-O -(2-sulfido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-arabinofuranosyl]-1,9-dihydro-6H -purin-6-one

2-Amino-9-[4-C -(difluoromethyl)-5-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-arabinofuranosyl]-1,9-dihydro-6H -purin-6-one

Adenosine, 2'-deoxy-4'-C -(difluoromethyl)-2'-fluoro-, 5'-[O ,O -bis(4-methoxyphenyl)phosphorothioate]