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The title compound, [Sn(C4H9)(C13H21N)Cl3]·CH2Cl2, was obtained by recrystallization of [2-(diisopropylaminomethyl)phenyl]tin(IV) butyl dichloride from a CH2Cl2/n-hexane mixture (1:4 v/v) in the presence of ambient moisture. Partial hydrolysis led to the title compound, the hydrochloric acid adduct of the dichloride, having a pentacoordinated Sn atom with a trigonal–bipyramidal C2SnCl3 core. The N atom of the 2-[(diisopropylammonio)methyl]phenyl ligand forms a strong intramolecular N—H...Cl hydrogen bond, resulting in a zwitterionic species, [2-(iPr2HN+CH2)C6H4]SnBuCl3−·CH2Cl2. Disorder was found in the n-butyl group, which was refined as disordered over three positions, with site occupancies of 0.22 (1), 0.51 (1) and 0.27 (2).