InChI=1S/C14H17BrN2O5/c1-21-9-4-3-8(15)12(22-2)11(9)13(19)16-7-14(20)6-5-10(18)17-14/h3-4,20H,5-7H2,1-2H3,(H,16,19)(H,17,18)/t14-/m1/s1