InChI=1/C18H16N2O4/c1-2-24-16-11-12(8-9-15(16)21)10-14-17(22)20(18(23)19-14)13-6-4-3-5-7-13/h3-11,21H,2H2,1H3,(H,19,23)/b14-10+/f/h19H 8B2EA203B56032A2