Crystal structure of (E,E)-2′,4′-di­hy­droxy­aceto­phenone azine di­methyl­formamide disolvate

In the title compound {systematic name: 4,4′-[1,1′-(hydrazinediyl­idene)bis­(ethan-1-yl-1-yl­idene)]bis­(benzene-1,3-diol)}, C16H16N2O4·2C3H7NO, the (E,E)-2′,4′-di­hydroxy­aceto­phenone azine mol­ecule is centrosymmetric, the mid-point of the N—N bond being located on an inversion centre. All the non-H atoms of the azine mol­ecule are approximately coplanar, the maximum deviation being 0.017 (2) Å. An intra­molecular O—H⋯N hydrogen bond occurs between the azine N atom and the hy­droxy group. In the crystal, azine and di­methyl­formamide solvent mol­ecules are linked by O—H⋯O hydrogen bonds.