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