InChI=1S/C21H20N4O/c1-14(26)12-22-20-18-17(15-8-4-2-5-9-15)19(16-10-6-3-7-11-16)25-21(18)24-13-23-20/h2-11,13-14,26H,12H2,1H3,(H2,22,23,24,25)/t14-/m1/s1