The crystal structure of the title salt, C 8 H 12 N + ÁC 4 H 3 O 4 À , consists of a 2,5-dimethylanilinium cation and an hydrogen maleate anion. In the anion, a strong intramolecular O-HÁ Á ÁO hydrogen bond is observed, leading to an S(7) graphset motif. In the crystal, the cations and anions pack in alternating layers parallel to (001).
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