InChI=1S/C18H16N6O2/c1-12-21-22-17-18(26)23(14-8-5-9-19-16(14)24(12)17)11-15(25)20-10-13-6-3-2-4-7-13/h2-9H,10-11H2,1H3,(H,20,25)