Acta Cryst. (2008). E64, o428 [ doi:10.1107/S1600536807065300 ]
Abstract: The title compound, C12H12Cl2N2O3, crystallizes as a non-merohedral twin with a twinning ratio of 0.51:0.49. The molecule adopts a keto-hydrazo tautomeric form stabilized by an intramolecular N-HO hydrogen bond. The configuration around the N-N bond is trans.
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