InChI=1S/C20H18O8/c1-24-14-5-4-11(6-16(14)25-2)15-9-13(21)20-17(26-3)7-12(8-18(20)28-15)27-10-19(22)23/h4-9H,10H2,1-3H3,(H,22,23)