InChI=1S/C28H26O8/c1-16(2)15-23(32)35-26-24-20(12-8-18-9-14-21(30)34-25(18)24)33-27(26)28(3,4)36-22(31)13-7-17-5-10-19(29)11-6-17/h5-15,26-27,29H,1-4H3/b13-7+