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) °. 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⋯N and O—H⋯O hydrogen bonds involving the hydr­oxy group and adjacent O and N atoms. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules, forming an infinite three-dimensional supra­molecular structure.