InChI=1S/C28H27NO5/c1-32-24-16-15-23(19-25(24)33-2)26(34-28(31)18-14-22-11-7-4-8-12-22)20-29-27(30)17-13-21-9-5-3-6-10-21/h3-19,26H,20H2,1-2H3,(H,29,30)/b17-13+,18-14+/t26-/m1/s1