InChI=1/C15H13N4O4/c1-21-11-6-3-8(7-12(11)22-2)15-16-14-10(19(15)20)5-4-9-13(14)18-23-17-9/h3,6-7H,4-5H2,1-2H3/q-1 451407198D2FE6DF