6,7-difluoro-1-(2-fluoro-4-nitrophenyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid ethyl ester
1-(2-Chloro-benzyl)-6,7-difluoro-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid ethyl ester
6,7-Difluoro-1-(2-fluoro-benzyl)-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid ethyl ester
1-(4-chlorobenzyl)-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid ethyl ester
ethyl 1-benzyl-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate