InChI=1S/C20H26O7/c1-9-10-4-5-11-19(17(26)27)7-3-6-18(2,16(24)25)13(19)12(15(22)23)20(11,8-10)14(9)21/h10-14,21H,1,3-8H2,2H3,(H,22,23)(H,24,25)(H,26,27)