InChI=1S/C21H20BrN3O2/c22-15-5-8-17-18(11-15)19(21(27)24-20(17)26)12-23-16-6-3-14(4-7-16)13-25-9-1-2-10-25/h3-8,11-12,23H,1-2,9-10,13H2,(H,24,26,27)/b19-12-