Bis(2-hydroxy­benzaldehyde oxime) O,O′-butane-1,4-diyldicarbonyl ether

The mol­ecule of the title compound, C(20)H(20)N(2)O(6), lies across a crystallographic inversion centre, the asymmetric unit comprising one half-mol­ecule. An intra­molecular O—H⋯N hydrogen bond generates a six-membered ring, producing an S(6) ring motif. Pairs of inter­molecular C—H⋯O hydrogen bonds link neighbouring mol­ecules into a layer with R (2) (2)(38) ring motif. The crystal structure is further stabilized by the inter­molecular C—H⋯π inter­actions.