InChI=1S/C20H16O8/c1-27-19(26)20(9-11-2-7-15(23)13(8-11)10-21)16(17(24)18(25)28-20)12-3-5-14(22)6-4-12/h2-8,10,22-24H,9H2,1H3/t20-/m1/s1