InChI=1S/C24H26O8/c1-3-17(13-5-9-15(25)10-6-13)18(4-2)14-7-11-16(12-8-14)31-24-21(28)19(26)20(27)22(32-24)23(29)30/h4-12,19-22,24-28H,2-3H2,1H3,(H,29,30)/b18-17-