InChI=1S/C21H26O8/c1-8-4-5-11-9(2)6-12-13(10(3)7-27-12)14(11)18(8)28-21-17(24)15(22)16(23)19(29-21)20(25)26/h6-8,15-19,21-24H,4-5H2,1-3H3,(H,25,26)