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In the title compound, C9H9NO3·H2O, the plane of the acetamide group is oriented at 20.52 (8)° with respect to the benzene ring, whereas the plane of the carboxylic acid group is essentially coplanar with the benzene ring [maximum deviation = 0.033 (1) Å]. In the crystal, classical O—HO and N—HO hydrogen bonds and weak C—HO hydrogen bonds link the organic molecules and water molecules of crystallization into a three-dimensional supramolecular architecture.