InChI=1S/C28H26O8/c1-14-8-20(19-7-6-18(30)13-23(19)32)26(28(35)36)21(9-14)27-24(33)10-15(11-25(27)34)2-3-16-4-5-17(29)12-22(16)31/h2-7,9-13,20-21,26,29-34H,8H2,1H3,(H,35,36)/b3-2+