InChI=1S/C16H12N2O6/c1-7(20)17-14-10(21)5-12-15(13(14)16(22)23)18-9-4-8(6-19)2-3-11(9)24-12/h2-5,19H,6H2,1H3,(H,17,20)(H,22,23)