L-Alanine, N -(hydroxyphenoxyphosphinothioyl)-, 1-methylethyl ester, 5′-ester with4-amino-1-[4-C -(difluoromethyl)-β-D-xylofuranosyl]-2(1H )-pyrimidinone

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

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

4-Amino-5-chloro-1-[3-deoxy-4-C -(difluoromethyl)-3-fluoro-5-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-xylofuranosyl]-2(1H )-pyrimidinone4-Amino-5-chloro-1-[3-deoxy-4-C -(difluoromethyl)-3-fluoro-5-O -(2-oxido-4H -1,3,2-benzodioxaphosphorin-2-yl)-β-D-xylofuranosyl]-2(1H )-pyrimidinone

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

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

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

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

L-Alanine, N -(hydroxyphenoxyphosphinothioyl)-, 1-methylethyl ester, 5′-ester with4-amino-1-[4-C -(difluoromethyl)-β-D-arabinofuranosyl]-2(1H )-pyrimidinone

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

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

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

L-Alanine, N ,N '-phosphinicobis-, 1,1'-bis(1-methylethyl) ester, 5'-ester with 4-amino-1-[2-deoxy-4-C -(difluoromethyl)-2-fluoro-β-Darabinofuranosyl]-2(1H )-pyrimidinone

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

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

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

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

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

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

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