Synonyms: 7H-Pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylicacid, 9,10-difluoro-2,3-dihydro-3-methyl-7-oxo-, (S)-;(S)-(-)-9,10-Difluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylicacid;9,10-Difluoro-3-(S)-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylicacid; Levofloxacin Q-acid