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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)°. The crystal structure is stabilized by inter-molecular O-H⋯O hydrogen bonds.
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. In the crystal, mol-ecules are linked via inter-molecular N-H⋯O hydrogen bonds, forming chains along the a axis.