... 3-DIHYDRO-7H-PYRIDO (1,2,3-DE)-1,4-BENZOXAZINE-6-CARBOXYLIC ACID;S-(-)-9,10-DIFLUORO-2,3-DIHYDRO-3-METHYL ... 7-OXO-7H-PYRIDO-[1,2,3-DE] [1,4]-BENZOXAZINE-6-CARBOXYLIC ACID;8,9-difluoro-3-methyl-6-oxo-2,3 ... 3-DIHYDRO-7H- PYRIDO (1,2,3-DE)-1,4-BENZOXAZINE-6-CARBOXYLIC ACID;S-(-)-9,10-DIFLUORO-2,3-DIHYDRO-3-METHYL ... 7-OXO-7H-PYRIDO-[1,2,3-DE][1,4]-BENZOXAZINE-6-CARBOXYLIC ACID;9,10-Difluoro-3(S)-methyl-7-oxo-2 ...