InChI=1S/C21H24O9/c1-7-4-10-13(9(3)6-28-10)14-12(7)11(5-8(2)15(14)22)29-21-18(25)16(23)17(24)19(30-21)20(26)27/h4,6,8,11,16-19,21,23-25H,5H2,1-3H3,(H,26,27)