4-[(2-Carb-oxy-eth-yl)amino]-benzoic acid monohydrate.

In the title compound, C(10)H(11)NO(4)·H(2)O, the carboxyl group is twisted at a dihedral angle of 6.1 (3)° with respect to the benzene ring. In the crystal, the organic mol-ecules are linked by pairs of O-H⋯O hydrogen bonds involving both carboxyl groups, forming zigzag chains propagating along the b-axis direction. The water mol-ecules form [100] chains linked by O-H⋯O hydrogen bonds. The organic mol-ecule and water chains are cross-linked by N-H⋯O(water) and O(water)-H⋯O hydrogen bonds, generating (001) sheets.