InChI=1S/C16H19BrN4O2/c1-4-23-16(14(22)20(2)15(18)21(16)3)8-10-9-19-13-7-11(17)5-6-12(10)13/h5-7,9,18-19H,4,8H2,1-3H3/t16-/m1/s1