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The structure of the centrosymmetric title compound, C8H6Cl2N2O2·2C3H7NO, shows that the hydro­ximo­yl chloride substituent has an essentially planar arrangement and the dihedral angle between this plane and the benzene plane is 18.3 (4)°. The hydro­ximo­yl chloride group has a cis configuration. The packing can be described as a polymeric arrangement of mol­ecules linked through O—H...O hydrogen bonds.

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The title compound, C13H11N3O, is essentially planar in the solid state and displays a trans configuration with respect to the azo double bond. The dihedral angle between the planes of the two aromatic rings is 4.9 (4)°. Mol­ecules form infinite chains via N—H...O and C—H...O hydrogen bonds.
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