10-hydroxy-9H-quino[4,3,2-de]-1,10-phenanthrolin-9-one 9H-quino[4,3,2-de][1,10]phenanthrolin-9-one, 10-hydroxy- InChI=1/C18H9N3O2/c22-12-6-8-20-16-14(12)18(23)17-13-10(5-7-19-15(13)16)9-3-1-2-4-11(9)21-17/h1-8H,(H,20,22