InChI=1S/C15H14N4O6/c20-13-7-12(18-15(23)19-13)9-17-25-5-4-24-16-8-10-2-1-3-11(6-10)14(21)22/h1-3,6-9H,4-5H2,(H,21,22)(H2,18,19,20,23)/b16-8+,17-9+