InChI=1/C16H14N2O4/c1-21-12-5-2-10(3-6-12)8-15(19)17-11-4-7-14-13(9-11)18-16(20)22-14/h2-7,9H,8H2,1H3,(H,17,19)(H,18,20)/f/h17-18H D8F1273583893796