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The title compounds, C11H10Cl2N2O4, are constitutional isomers which exhibit similar molecular geometry. The configuration about the N=C bond is E in both molecules. The same packing pattern was found in both structures. Hydrogen-bonded dimers, formed around the inversion centres via O-H...O interactions of carboxyl groups are connected into infinite chains. The intramolecular hydrogen bond N—H...Cl observed only in the 2,5-dichlorophenyl derivative contributes to the planarity of the molecule.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, 1, 2

CCDC references: 128165; 128166

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