InChI=1S/C20H18N4OS/c21-12-16(13-4-2-1-3-5-13)24-20(25)18-7-6-17(26-18)14-8-10-22-19-15(14)9-11-23-19/h1-11,16H,12,21H2,(H,22,23)(H,24,25)/t16-/m1/s1