InChI=1S/C20H18O8/c1-24-13-7-11(8-14(25-2)17(13)23)18-15(9-21)26-12-5-3-10-4-6-16(22)27-19(10)20(12)28-18/h3-8,15,18,21,23H,9H2,1-2H3/t15-,18-/m0/s1