N-(2-Chloro-4-nitro­phen­yl)maleamic acid monohydrate

The title compound, C₁₀H₇ClN₂O₅·H₂O, crystallizes with a half-mol­ecule each of N-(2-chloro-4-nitro­phen­yl)maleamic acid (located on a mirror plane) and water (located on a twofold rotation axis) in the asymmetric unit. The main mol­ecule is planar by symmetry and its conformation is stabilized by an intra­molecular O—H...O hydrogen bond. In the crystal, N—H...O and O—H...O hydrogen bonds link the mol­ecules into a three-dimensional network.