InChI=1S/C20H22O8/c1-9-6-13(22)20(12(4)19(26)27-5)14(28-18(25)11(3)8-21)7-10(2)17(24)15(20)16(9)23/h6,10,14,21,23H,3-4,7-8H2,1-2,5H3