InChI=1/C14H11BrN2O4/c1-2-5-17-13(20)9(12(19)16-14(17)21)6-8-3-4-11(18)10(15)7-8/h2-4,6-7,18H,1,5H2,(H,16,19,21)/b9-6+/f/h16H 2091D7B4255335C4