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