title: N-(2,4,6-Trichloro-phen-yl)maleamic acid.
abstract: In the crystal structure of the title compound, C(10)H(6)Cl(3)NO(3), the conformation of the amide bond is trans. The C=O and O-H bonds of the acid group are in the relatively rare anti position to each other. This is a consequence of the intra-molecular O-H⋯O hydrogen bond donated to the amide carbonyl group stabilizing the mol-ecular structure. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into zigzag chains along the c axis.
authors.forename: K
authors.initials: K
authors.lastname: Shakuntala
authors.forename: Sabine
authors.initials: S
authors.lastname: Foro
authors.forename: B Thimme
authors.initials: BT
authors.lastname: Gowda
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