2-[(2-Hy-droxy-4-meth-oxy-benzyl-idene)aza-nium-yl]benzoate monohydrate.

In the title compound, C(15)H(13)NO(4)·H(2)O, the Schiff base exists in a zwitterionic form and a bifurcated intra-molecular N-H⋯(O,O) hydrogen bond generates two S(6) rings. The dihedral angle between the two benzene rings is 25.8 (2)°.

N'-(2-Hy-droxy-1-naphth-yl-methylidene)-3-meth-oxy-benzohydrazide.

In the title compound, C(19)H(16)N(2)O(3), the dihedral angle between the naphthalene ring system and the benzene ring is 19.8 (3)°. An intra-molecular O-H⋯N hydrogen bond stabilizes the mol-ecular conformation.