InChI=1/C20H16N4O4/c1-2-5-10(13-15(25)11-6-3-8-21-17(11)23-19(13)27)14-16(26)12-7-4-9-22-18(12)24-20(14)28/h2-10H,1H3,(H2,21,23,25,27)(H2,22,24,26,28)/p-2/b5-2+/fC20H14N4O4/h23-24H/q-2 5E6C3E2CA89A185C