InChI=1S/C20H20BrN5O/c1-26(2)10-4-7-19(27)24-16-8-9-18-17(12-16)20(23-13-22-18)25-15-6-3-5-14(21)11-15/h3-9,11-13H,10H2,1-2H3,(H,24,27)(H,22,23,25)/b7-4+