InChI=1S/C18H14N2O5/c1-24-8-9-5-6-14(25-9)17-16-11(7-12(19-17)18(22)23)10-3-2-4-13(21)15(10)20-16/h2-7,20-21H,8H2,1H3,(H,22,23)