(S)-2,2′-Dihydroxy-N,N′-(6-hydroxyhexane-1,5-diyl)dibenzamide

In the title compound, C20H24N2O5, the dihedral angle between the two roughly planar salicylamide fragments [r.m.s. deviations = 0.043 (2) and 0.149 (2) ] is 25.50 (5)°. The molecular conformation is stabilized by intramolecular O—H...O hydrogen bonds involving phenol –OH groups and amide O atoms. Intermolecular hydroxymethyl–amide O—H...O and amine–hydroxymethyl N—H...O hydrogen bonds form infinite chains along the b axis. These chains are further interlinked by amine–amide N—H...O and phenol–phenol O—H...O interactions, thus giving layers parallel to (001).