InChI=1S/C19H16O8/c1-18(26)7-3-2-4-10(20)13(7)16(24)14-8(18)5-9-15(23)11(21)6-12(22)19(9,27)17(14)25/h2-4,8-9,14,20,26-27H,5-6H2,1H3/t8?,9?,14?,18-,19-/m1/s1