InChI=1S/C19H18N4O2/c20-16-7-3-1-6-15(16)19(25)23-12-18(24)21-10-9-13-11-22-17-8-4-2-5-14(13)17/h1-11,22H,12,20H2,(H,21,24)(H,23,25)/b10-9+