InChI=1S/C21H16N2O4.Fe/c24-19-7-3-1-5-15(19)12-22-17-10-9-14(21(26)27)11-18(17)23-13-16-6-2-4-8-20(16)25;/h1-13,24-25H,(H,26,27);/q;+4/p-2/b22-12+,23-13+;