InChI=1S/C23H20N2O4/c26-21-7-3-1-5-17(21)14-24-19-11-9-16(10-12-23(28)29)13-20(19)25-15-18-6-2-4-8-22(18)27/h1-9,11,13-15,24-25H,10,12H2,(H,28,29)/b17-14-,18-15-