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

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

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

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

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

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

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

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

N ,N '-[4'-C -(Difluoromethyl)-5'-cytidylylidene]bis[L-alanine] 1,1'-bis(1-methylethyl) ester

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

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

L-Alanine, N ,N '-(hydroxyphosphinothioylidene)bis-, 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

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

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

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

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 ,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

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

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

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