title: (Z)-Ethyl 4-chloro-2-[(4-chloro-phen-yl)hydrazono]-3-oxobutanoate.
abstract: The title compound, C(12)H(12)Cl(2)N(2)O(3), crystallizes as a non-merohedral twin with a twinning ratio of 0.51:0.49. The mol-ecule adopts a keto-hydrazo tautomeric form stabilized by an intra-molecular N-H⋯O hydrogen bond. The configuration around the N-N bond is trans.
authors.forename: Gökhan
authors.initials: G
authors.lastname: Alpaslan
authors.forename: Ozgür
authors.initials: O
authors.lastname: Ozdamar
authors.forename: Mustafa
authors.initials: M
authors.lastname: Odabaşoğlu
authors.forename: Orhan
authors.initials: O
authors.lastname: Büyükgüngör
authors.forename: Ahmet
authors.initials: A
authors.lastname: Erdönmez