InChI=1S/C28H26O5/c1-17-5-21(29)13-23(7-17)31-25-9-19(3)11-27(15-25)33-28-12-20(4)10-26(16-28)32-24-8-18(2)6-22(30)14-24/h5-16,29-30H,1-4H3