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 carb-oxy-lic 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 mol-ecules form a dimer via N-H⋯O hydrogen bonds. In addition, the 2-naphthanoic acid mol-ecule is hydrogen bonded to the pyridine unit of an isonicotinamide mol-ecule via an O-H⋯N hydrogen bond. This gives rise to a centrosymmetric four-mol-ecule chain, which is cross-linked by further N-H⋯O hydrogen bonds from the amide group.