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In the title salt, C5H7N+·C6H3ClNO−, the 2-amino­pyri­din­ium cation inter­acts with the carboxyl­ate group of the 6-chloro­nicotinate anion through a pair of independent N—H⋯O hydrogen bonds, forming an R 2 2(8) ring motif. In the crystal, these dimeric units are connected further via N—H⋯O hydrogen bonds, forming chains along [001]. In addition, weak C—H⋯N and C—H⋯O hydrogen bonds, together with weak π–π inter­actions, with centroid–centroid distances of 3.6560 (5) and 3.6295 (5) Å, connect the chains, forming a two-dimensional network parallel to (100).

The N9—H protonated and N7—H tautomeric form of N 6-benzoyl­adenine cations are bridged by one of the oxygen atoms of the nitrate anion via N—H⋯O hydrogen bonds, generating a ribbon motif. The cations also form base pairs via N—H⋯O and C—H⋯N hydrogen bonds.

The title compound, C5H6N4O, is approximately planar, with an angle of 11.04 (15)° between the planes of the pyrimidine ring and the non-H atoms of the carboximidamide unit. The mol­ecule adopts an E configuration about the C=N double bond. In the crystal, adjacent mol­ecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R 2 2(10) ring motif. The dimers are further linked via N—H⋯N and O—H⋯N hydrogen bonds into a sheet structure parallel to the ac plane. The crystal structure also features N—H⋯O and weak C—H⋯O hydrogen bonds and offset π–π stacking inter­actions between adjacent pyrimidine rings [centroid–centroid distance = 3.622 (1) Å].