Crystal structures of (<i>E</i>)-1-{3-[(5-fluoro-2-hydroxybenzylidene)amino]phenyl}ethanone and of a fourth polymorph of (<i>E</i>)-1-{3-[(2-hydroxy-3-methoxybenzylidene)amino]phenyl}ethanone
Acta crystallographica. Section E, Crystallographic communications