InChI=1S/C21H20N4O2/c1-26-18-7-3-5-16(14-20-24-10-11-25-20)21(18)27-17-6-2-4-15(12-17)13-19-22-8-9-23-19/h2-12H,13-14H2,1H3,(H,22,23)(H,24,25)