Isonicotinamide–2-naphthoic acid (1/1)

In the title 1:1 adduct, C(6)H(6)N(2)O·C(11)H(8)O(2), the amide group is slightly twisted out of the plane of the aromatic ring, with a C—C—C—N torsion angle of 25.11 (19)°, whereas the carb­oxy­lic acid group is approximately coplanar with the bicylic ring system, with a C—C—C—O torsion angle of 10.9 (2)°. The amide groups from two isonicotinamide mol­ecules form a dimer via N—H⋯O hydrogen bonds. In addition, the 2-naphthanoic acid mol­ecule is hydrogen bonded to the pyridine unit of an isonicotinamide mol­ecule via an O—H⋯N hydrogen bond. This gives rise to a centrosymmetric four-mol­ecule chain, which is cross-linked by further N—H⋯O hydrogen bonds from the amide group.