InChI=1S/C19H16O8/c1-22-13-3-9-11(5-14(13)23-2)27-17-7-24-12-6-16-15(25-8-26-16)4-10(12)19(17,21)18(9)20/h3-6,17,21H,7-8H2,1-2H3/t17-,19-/m1/s1