N-(2,5-Dichlorophenyl)maleamic acid

The asymmetric unit of the title compound, C10H7Cl2NO3, contains two independent molecules. The molecular conformation of each maleamic unit is stabilized by an intramolecular O—H...Ocarbonyl hydrogen bond owing to the anti disposition of the participating entities. The mean planes through the benzene ring and the amido group are inclined at angles of 45.7 (1) and 40.8 (1)° in the two molecules. In the crystal, the independent molecules self-associate via N—H...O hydrogen bonds into zigzag ribbons propagating along the a axis. The ribbons are weakly coupled by C—H...π and C—H...O interactions