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

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

2-Amino-9-[5-O -[bis(4-methoxyphenoxy)phosphinyl]-4-C -(difluoromethyl)-β-D-xylofuranosyl]-1,9-dihydro-6H -purin-6-one

9-[5-O -[Bis(4-methoxyphenoxy)phosphinothioyl]-3-deoxy-4-C -(difluoromethyl)-3-fluoro-β-D-xylofuranosyl]-9H -purin-6-amine

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

9-[5-O -[Bis(4-methoxyphenoxy)phosphinyl]-3-deoxy-4-C -(difluoromethyl)-3-fluoro-β-Dxylofuranosyl]-9H -purin-6-amine

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-[5-O -[bis(4-methoxyphenoxy)phosphinothioyl]-4-C -(difluoromethyl)-β-Darabinofuranosyl]-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

2-Amino-9-[5-O -[bis(4-methoxyphenoxy)phosphinyl]-4-C -(difluoromethyl)-β-Darabinofuranosyl]-1,9-dihydro-6H -purin-6-one

9-[5-O -[Bis(4-methoxyphenoxy)phosphinothioyl]-2-deoxy-4-C -(difluoromethyl)-2-fluoro-β-D-arabinofuranosyl]-9H -purin-6-amine

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

9-[5-O -[Bis(4-methoxyphenoxy)phosphinyl]-2-deoxy-4-C -(difluoromethyl)-2-fluoro-β-Darabinofuranosyl]-9H -purin-6-amine

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

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

Bis(4-methoxyphenyl) 4'-C -(difluoromethyl)-5'-guanylate

4'-C -(Difluoromethyl)-5'-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)guanosine

4'-C -(Difluoromethyl)-5'-O -(2-sulfido-4H -1,3,2-benzodioxaphosphorin-2-yl)guanosine

Adenosine, N -benzoyl-4'-C -(difluoromethyl)-3',5'-bis-O -(phenylmethyl)-, 2'-acetate