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The title compound, C12H12Cl2N2O3, crystallizes as a non-merohedral twin with a twinning ratio of 0.51:0.49. The molecule adopts a keto&#8211;hydrazo tautomeric form stabilized by an intramolecular N&#8212;H...O hydrogen bond. The configuration around the N&#8212;N bond is trans

(Z)-Ethyl 4-chloro-2-[(4-chlorophenyl)hydrazono]-3-oxobutanoate