InChI=1S/C19H15N7O2/c27-26(28)17-6-2-5-16(10-17)23-19-21-8-7-18(24-19)15-4-1-3-14(9-15)11-25-13-20-12-22-25/h1-6,8-10,12-13H,7,11H2/b23-19-