ethyl (5R-cis)- and (5R-trans)-5-benzyloxymethyl-5-(2,4-difluorophenyl)-2-oxo-3-tetrahydrofurancarboxylate

(2R-trans)-2-benzyloxymethyl-2-(2,4-difluorophenyl)-4-[[(4-methylphenyl)sulfonyloxy]methyl]tetrahydrofuran