Figure 1 The molecular structure of the title compound, showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. O-H...Cl and N-H...Cl hydrogen bonds are shown as double dashed lines [symmetry code: (i) -x+1, -y+1, -z]. The 4-(dimethylamino)pyridinium cations consists of ordered (A) and disordered (B) entities. The organic entity (B) is disordered about an inversion center.  [article HTML]