InChI=1S/C21H18N4O4/c26-19-13-29-12-11-25(19)17-7-5-16(6-8-17)23-21-22-10-9-18(24-21)14-1-3-15(4-2-14)20(27)28/h1-10H,11-13H2,(H,27,28)(H,22,23,24)