Crystal structure of 4-{[(2,4-dihydroxybenzylidene) amino] methyl} cyclohexanecarboxylic acid

In the title compound, C15H19NO4, the cyclo-hexyl ring adopts a chair conformation with both exocyclic C-C bonds in equatorial orientations. The dihedral angle between the basal plane of cyclo-hexyl ring and the 2,4-di-hydroxy-benzaldehyde moiety is 84.13(13). An intra-molecular O-H?N hydrogen bonds closes an S(6) ring. In the crystal, O-c-H center dot center dot center dot O-p (c = carb-oxy-lic acid, p = phenol) hydrogen bonds link the mol-ecules into [100] C(13) chains whereas an Op-H center dot center dot center dot O-c hydrogen bond generates [101] C(15) chains. Together, these bonds generate (010) sheets incorporating R-2(2)(20) loops. Weak C-H center dot center dot center dot O and C-H center dot center dot center dot pi inter-actions also occur.