Experimental

R factor = 0.044; wR factor = 0.096; data-to-parameter ratio = 15.9. In the title molecular salt, C19H18BrClN3O2 +Cl, the dihedral angles between the pyrimidine ring and the chlorobenzene and bromobenzene rings are 72.4 (2) and 45.5 (2), respec-tively. The dihedral angle between the chlorobenzene and bromobenzene rings is 27.5 (2). The conformation of the molecule is stabilized by an intramolecular C—H O inter-action. In the crystal, the anion and cation are linked by an N—H Cl hydrogen bond. Pairs of weak C—H O and C— H Cl hydrogen bonds form inversion dimers. Further N— H Cl hydrogen bonds form R21(6) motifs and link the dimers into chains along [101]. Br Cl short contacts [3.482 (2) Å] interlink the hydrogen-bonded chains along the b-axis direction. Related literature For a study of chloride salts of dihydropyrimidine derivatives and their anti-tubercular activity, see: Venugopala, Nayak, Pillay et al. (2012). For the crystal structures of dihydro