InChI=1S/C20H26O7/c1-10-7-19-8-20(10,27)12(22)6-11(19)18(9-21)5-3-4-17(2,16(25)26)14(18)13(19)15(23)24/h9,11-14,22,27H,1,3-8H2,2H3,(H,23,24)(H,25,26)