InChI=1/C18H16N4O4/c1-11-15(18(26)22(21-11)12-5-3-2-4-6-12)10-19-20-17(25)14-8-7-13(23)9-16(14)24/h2-10,19,23-24H,1H3,(H,20,25)/b15-10-/f/h20H A73F7F0A2E75A01B