InChI=1S/C18H19BrN4O/c1-23(2)10-9-21-18(24)13-7-3-5-11-15(20)12-6-4-8-14(19)17(12)22-16(11)13/h3-8H,9-10H2,1-2H3,(H2,20,22)(H,21,24)/p+2