InChI=1/C18H14N2O3/c21-16-8-4-3-7-15(16)18(23)20-19-11-14-9-12-5-1-2-6-13(12)10-17(14)22/h1-11,21-22H,(H,20,23)/b19-11+/f/h20H 35D626028489F5DB