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