InChI=1S/C27H22N2O4/c30-26(32-24-7-3-1-4-8-24)28-22-15-11-20(12-16-22)19-21-13-17-23(18-14-21)29-27(31)33-25-9-5-2-6-10-25/h1-18H,19H2,(H,28,30)(H,29,31)