InChI=1S/C21H22O8/c1-9(2)11-5-4-10(3)12-6-7-13(14(12)8-11)20(27)29-21-17(24)15(22)16(23)18(28-21)19(25)26/h4-8,15-18,21-24H,1H2,2-3H3,(H,25,26)