L-Alanine, N ,N '-phosphinicobis-, 1,1'-bis(1-methylethyl) ester, 5'-ester with 1-[3-deoxy-4-C -(difluoromethyl)-3-fluoro-β-D-xylofuranosyl]-2,4(1H ,3H )-pyrimidinedione

9-[5-O -[Bis(4-methoxyphenoxy)phosphinothioyl]-4-C -(difluoromethyl)-β-D-arabinofuranosyl]-9H -purin-6-amine

4-Amino-1-[5-O -[bis(4-methoxyphenoxy)phosphinyl]-2-deoxy-4-C -(difluoromethyl)-2-fluoro-β-D-arabinofuranosyl]-5-chloro-2(1H )-pyrimidinone

L-Alanine, N -(hydroxyphenoxyphosphinyl)-, 1-methylethyl ester, 5'-ester with 4-amino-1-[4-C -(difluoromethyl)-β-D-arabinofuranosyl]-2(1H )-pyrimidinone

L-Alanine, N ,N '-phosphinicobis-, 1,1'-bis(1-methylethyl) ester, 5'-ester with 1-[2-deoxy-4-C -(difluoromethyl)-2-fluoro-β-D-arabinofuranosyl]-2,4(1H ,3H )-pyrimidinedione

L-Alanine, N ,N '-(hydroxyphosphinothioylidene)bis-, 1,1'-bis(1-methylethyl) ester, 5'-ester with 1-[2-deoxy-4-C -(difluoromethyl)-2-fluoro-β-D-arabinofuranosyl]-2,4(1H ,3H )-pyrimidinedione

Bis(4-methoxyphenyl) 5-chloro-2'-deoxy-4'-C -(difluoromethyl)-2'-fluoro-5'-cytidylate

Bis(4-methoxyphenyl) 2'-deoxy-4'-C -(difluoromethyl)-2',5-difluoro-5'-cytidylate

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

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

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

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

Guanosine, 2'-deoxy-4'-C -(difluoromethyl)-2',2'-difluoro-, cyclic 3',5'-[O -(1-methylethyl)phosphorothioate]

Guanosine, 2'-deoxy-4'-C -(difluoromethyl)-2',2'-difluoro-, cyclic 3',5'-(1-methylethylphosphate)

4-Amino-5-chloro-1-[4-C -(difluoromethyl)-5-O -(2-sulfido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-xylofuranosyl]-2(1H )-pyrimidinone

4-Amino-1-[4-C -(difluoromethyl)-5-O -(2-sulfido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-arabinofuranosyl]-5-fluoro-2(1H )-pyrimidinone

4-Amino-5-chloro-1-[4-C -(difluoromethyl)-5-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-xylofuranosyl]-2(1H )-pyrimidinone

4-Amino-1-[4-C -(difluoromethyl)-5-O -(2-sulfido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-xylofuranosyl]-5-fluoro-2(1H )-pyrimidinone

4-Amino-1-[4-C -(difluoromethyl)-5-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-xylofuranosyl]-5-fluoro-2(1H )-pyrimidinone

4-Amino-1-[5-O -[bis(4-methoxyphenoxy)phosphinothioyl]-3-deoxy-4-C -(difluoromethyl)-3-fluoro-β-D-xylofuranosyl]-5-chloro-2(1H )-pyrimidinone