InChI=1/C14H12N2O4/c1-8(17)9-4-11(15-6-9)14(18)16-10-2-3-12-13(5-10)20-7-19-12/h2-6,15H,7H2,1H3,(H,16,18)/f/h16H C01F54F8D5EEA2F8