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(4Z)-4-[(2-Chloro-anilino)(phen-yl)methyl-idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one. 2012

Li-Ying Xu, and Ning Li, and Jia-Min Li, and Heng-Qiang Zhang, and Zhen-Hai Sun

The title compound, C(23)H(18)ClN(3)O, exists in an enamine-keto form with the amino group involved in an intra-molecular N-H⋯O hydrogen bond. The five-membered ring is nearly planar, the largest deviation being 0.0004 (7) Å, and makes dihedral angles of 16.62 (6), 41.89 (5) and 71.27 (4)° with the phenyl rings. In the crystal, weak C-H⋯O hydrogen bonds link the mol-ecules into supra-molecular chains along the b axis.

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