Crystal structure of [propane-1,3-diylbis(piperidine-4,1-di-yl)]bis-[(pyridin-4-yl)methanone]-4,4'-oxydi-benzoic acid (1/1).

In the title co-crystal, C25H32N4O2·C14H10O5, mol­ecules are connected into supra­molecular chains aligned along [102] by O—H⋯N hydrogen bonding. These aggregate into supra­molecular layers oriented parallel to (20-1) by C—H⋯O inter­actions. These layers then stack in an ABAB pattern along the c crystal direction to give the full three-dimensional crystal structure. The central chain in the dipyridylamide has an anti–anti conformation. The dihedral angle between the aromatic ring planes is 29.96 (3)°. Disorder is noted in some of the residues in the structure and this is manifested in two coplanar dispositions of one statistically disordered carb­oxy­lic acid group.