InChI=1S/C21H30O9/c1-9-4-5-19(2)11(6-9)29-16-10(7-20(19,3)21(16)8-27-21)28-18-14(24)12(22)13(23)15(30-18)17(25)26/h6,10-16,18,22-24H,4-5,7-8H2,1-3H3,(H,25,26)