InChI=1S/C20H28O7/c1-9-6-12-7-10(2)16(22)15(12)11(3)13(9)4-5-26-20-19(25)18(24)17(23)14(8-21)27-20/h6,10,14,17-21,23-25H,4-5,7-8H2,1-3H3