InChI=1/C15H12N4O4/c1-8-3-4-12(13(5-8)19(22)23)17-7-11-9(2)10(6-16)14(20)18-15(11)21/h3-5,7H,1-2H3,(H2,18,20,21)/p-2/fC15H10N4O4/q-2 992B1A4E47F3E23D