InChI=1/C15H12N4O2/c20-12-6-5-11(14(21)7-12)9-17-19-15-13-4-2-1-3-10(13)8-16-18-15/h1-9,20-21H,(H,18,19)/b17-9+/f/h19H 38858E29A03323C1