InChI=1S/C22H20N2O4/c1-13-3-7-15(8-4-13)23-19-11-18(22(27)28)20(12-17(19)21(25)26)24-16-9-5-14(2)6-10-16/h3-12,23-24H,1-2H3,(H,25,26)(H,27,28)