6,6′-dihydroxy-2,2′-[(propane-1,3-diyldioxy)bis(nitrilomethylidyne)]diphenol

The molecule of the title compound, C(17)H(18)N(2)O(6), adopts a V-shaped conformation, the dihedral angle between the two halves of the molecule being 81.31 (4) degrees. There is one half-molecule in the asymmetric unit, with a crystallographic twofold rotation axis passing through the central C atom. There are strong intramolecular O-H center dot center dot center dot N and O-H center dot center dot center dot O hydrogen bonds involving the hydroxy group and adjacent O and N atoms. In the crystal structure, intermolecular O-H center dot center dot O hydrogen bonds link the molecules, forming an infinite three-dimensional supramolecular structure.