InChI=1/C14H10N4O4/c19-14(11-8-15-12-4-2-1-3-10(11)12)17-16-7-9-5-6-13(22-9)18(20)21/h1-8,15H,(H,17,19)/b16-7+/f/h17H B2ACAF782ABAD437