InChI=1S/C18H23BrN2O4/c1-11-7-12(2)10-21(9-11)18(25)14-8-13(19)3-4-15(14)20-16(22)5-6-17(23)24/h3-4,8,11-12H,5-7,9-10H2,1-2H3,(H,20,22)(H,23,24)/t11-,12+