InChI=1S/C20H26O11/c1-7(8-4-5-10(21)9(12(8)22)6-11-20(2,3)31-11)18(28)30-19-15(25)13(23)14(24)16(29-19)17(26)27/h4-5,7,11,13-16,19,21-25H,6H2,1-3H3,(H,26,27)