7H-1,2,4-oxadiazino[6,5,4-ij]quinoline-6-carboxylic acid, 9,10-difluoro-3-methyl-7-oxo-, ethyl ester InChI=1/C14H10F2N2O4/c1-3-21-14(20)8-5-18-6(2)17-22-13-10(16)9(15)4-7(11(13)18)12(8)19/h4-5H,3H2,1-2H ethyl 9,10-difluoro-3-methyl-7-oxo-7H-[1,2,4]oxadiazino[6,5,4-ij]quinoline-6-carboxylate