InChI=1S/C21H18N4O2/c1-12-19-24-17-9-5-3-7-15(17)21(27)25(19)18(20(26)23-12)10-13-11-22-16-8-4-2-6-14(13)16/h2-9,11-12,18,22H,10H2,1H3,(H,23,26)/t12-,18+/m0/s1