InChI=1S/C20H26O11/c21-8-11-14(23)17(26)19(29-11)28-9-12-15(24)16(25)18(27)20(30-12)31-13(22)7-6-10-4-2-1-3-5-10/h1-7,11-12,14-21,23-27H,8-9H2/b7-6+