InChI=1/C21H20N2O4/c1-25-17-8-12(9-18(26-2)20(17)27-3)19-15(11-23-21(19)24)14-10-22-16-7-5-4-6-13(14)16/h4-10,22H,11H2,1-3H3,(H,23,24)/f/h23H 0DD1EA40C39B4430