InChI=1S/C20H28O7/c1-10-5-6-18(25)16(3)9-19(26)17(4,12(7-13(16)22)11(2)8-21)15(24)20(18,27-19)14(10)23/h7,10-11,14,21,23,25-26H,5-6,8-9H2,1-4H3