InChI=1S/C21H22O11/c1-8(9-5-3-2-4-6-9)13(23)12-11(7-10(22)14(24)15(12)25)31-21-18(28)16(26)17(27)19(32-21)20(29)30/h2-8,16-19,21-22,24-28H,1H3,(H,29,30)