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