InChI=1/C20H16N2O4/c1-25-15-8-7-11(9-16(15)26-2)17-18(20(24)22-19(17)23)13-10-21-14-6-4-3-5-12(13)14/h3-10,21H,1-2H3,(H,22,23,24)/f/h22H 6CEBC46ECAFB3205