InChI=1S/C20H26O11/c1-8(7-21)3-4-11-12(22)6-5-10(13(11)23)9(2)19(29)31-20-16(26)14(24)15(25)17(30-20)18(27)28/h3,5-6,9,14-17,20-26H,4,7H2,1-2H3,(H,27,28)/b8-3+