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In the crystal structure of the title salt, C 6 H 10 N 3 O + ·C 7 H 4 ClO 2  - , the dihedral angle between the pyrimidine ring of the 2-amino-4-meth-oxy-6-methyl-pyrimidine cation and the the benzene ring of the 2-chloro-benzoate anion is 2.2 (1)°. In the anion, the benzene ring forms a dihedral angle of 8.5 (2)° with the carboxyl group. The pyrimidine N atom of the cation is protonated and the meth-oxy substituent is essentially coplanar with the parent ring. The protonated N atom and the N atom of the 2-amino group are hydrogen bonded to the 4-chloro-benzoate anion through a pair of N-H⋯O carbox-yl hydrogen bonds, forming an R  2  2 (8) ring motif linked through a centrosymmetric R  2  4 (8) ring motif, resulting in a pseudo-tetra-meric DDAA array. These units are linked through inter-molecular meth-oxy C-H⋯Cl hydrogen bonds into ribbon-like chains extending along the c -axis direction. The crystal structure also features π-π stacking inter-actions between the rings in the cation and anion [minimum ring centroid separation = 3.7707 (12) Å].

Crystal structure, hydrogen bonding and Hirshfeld surface analysis of 2-amino-4-methoxy-6-methylpyrimidinium 4-chlorobenzoate