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The structure of the title compound, C23H27N2O4 +·C8H3Cl2O4 −, a 1:1 proton-transfer compound of brucine with 4,5-dichlorophthalic acid, has been determined at 130 K. The brucinium cations and the hydrogen phthalate anions associate through single N—H...Ocarboxylate hydrogen bonds [2.639 (3) Å], giving dimers which are extended via weak head-to-tail C—H...Omethoxy associations into chains forming down the 21 screw axis of the unit cell. The carboxyl proton of the anion gives a shortdoi:10.1107/s1600536807047952 fatcat:zr6ozrw7hnavlatjrul26tcqui