title: 2-Aminoterephthalic acid dimethyl ester.
abstract: Single crystals of the title compound, C(10)H(11)NO(4), an inter-mediate in the industrial synthesis of yellow azo pigments, were obtained from the industrial production. The mol-ecules crystallize as centrosymmetic dimers connected by two symmetry-related N-H⋯O=C hydrogen bonds. Each mol-ecule also contains an intra-molecular N-H⋯O=C hydrogen bond. The dimers form stacks along the a-axis direction. Neighbouring stacks are arranged into a herringbone structure.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Brüning
authors.forename: Jan W
authors.initials: JW
authors.lastname: Bats
authors.forename: Martin U
authors.initials: MU
authors.lastname: Schmidt