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In the title compound, C 18 H 40 NO 2+ ·Br − , the ion pairs formed by the hydrogen-bonded bromide anions and organic cations are arranged into thick layers with the alkyl groups directed to the inside and the trimethyl­aminium groups and the bromide anions situated on the layer surface. The long alkyl chain in the cation adopts an all- trans  conformation. In the crystal structure, molecules are connected by intermolecular O—H⋯Br hydrogen bonds, forming ionic pairs that are further connected into an extended chain structure  via  C—H⋯O hydrogen-bonding interactions. The crystal is chiral but nearly 90% of atoms in the unit cell are related by a pseudo-inversion center. The crystal shows racemic twinning with a 0.33:0.67 domain ratio.

3-Dodecyloxy-2-hydroxy-N,N,N-trimethylpropan-1-aminium bromide