InChI=1S/C20H26O8/c1-8-5-19-6-9(8)3-4-11(19)20(17(27)28)7-10(21)14(22)18(2,16(25)26)13(20)12(19)15(23)24/h9-14,21-22H,1,3-7H2,2H3,(H,23,24)(H,25,26)(H,27,28)