1-(2,3-Di-hydroxy-prop-yl)-4-{2-[4-(di-methyl-amino)-phen-yl]vin-yl}pyridinium chloride.

The title compound, C18H23N2O2 (+)·Cl(-), crystallizes with two independent cations and anions per cell. Each cation has twofold rotational disorder about the linking vinyl groups but with unequal occupancies [0.963 (5):0.037 (5) and 0.860 (8):0.140 (8)]. The two independent cations are close to being related by an inversion centre but the data does not support the expected centrosymmetric space-group assignment. The conclusion is that the differing rotational disorder has lead to an overall non-centrosymmetric lattice. In the crystal, the mol-ecules pack in layers parallel to (133) and (-13-3), chain-linked with motif C (1) 2(7) by the di-hydroxy-propyl O-H⋯Cl⋯H-O hydrogen bonds. Other lattice binding is provided by O-H⋯Cl, C-H⋯Cl and C-H⋯N inter-actions.