(E)-2-{4-[1-(Hydroxyimino)ethyl]phenyl-iminomethyl}-6-methoxyphenol mono-hydrate.

In the title compound, C(16)H(16)N(2)O(3)·H(2)O, the benzene rings are nearly coplanar with each other, forming a dihedral angle of 4.46 (3)°. There is a strong intra-molecular O-H⋯N hydrogen bond which results in a six-membered ring. In the crystal, the mol-ecules are connected into a three-dimensional network via O-H⋯O and O-H⋯N inter-molecular hydrogen bonds, forming a centrosymmetric ring along the b axis with graph-set motif R(4) (4)(10). In addition, the short distances between the centroids of six-membered rings [3.555 (1) Å], indicate the existence of π-π stacking inter-actions, which may stabilize the crystal structure.