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