InChI=1S/C28H26N2O5/c1-20-26(29-28(35-20)23-10-6-3-7-11-23)19-33-24-14-12-21(13-15-24)18-34-30-25(16-17-27(31)32)22-8-4-2-5-9-22/h2-15H,16-19H2,1H3,(H,31,32)/b30-25+