InChI=1S/C13H13BrN4O2/c1-18-9(5-16-13(18)15)10-7-4-6(14)2-3-8(7)17-11(10)12(19)20/h2-4,9,17H,5H2,1H3,(H2,15,16)(H,19,20)/t9-/m1/s1