title: (Z)-4-[(2-Amino-4,5-dichloro-anilino)(phenyl)methyl-idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one.
abstract: The mol-ecule of the title compound, C(23)H(18)Cl(2)N(4)O, assumes a non-planar conformation in which the pyrazolone ring forms dihedral angles of 32.61 (19), 76.73 (14) and 52.57 (19)° with the three benzene rings. The secondary amino group is involved in an intra-molecular N-H⋯O hydrogen bond. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers. An offset stacking inter-action is observed between the chloro-substituted benzene rings protruding on both sides of these dimers [centroid-centroid distance = 3.862 (1) Å].
authors.affiliation: College of Chemical Engineering, Northwest University, Xi'an 710069, Shannxi,  People's Republic of China.
authors.forename: Dan
authors.initials: D
authors.lastname: Zou
authors.forename: Xingqiang
authors.initials: X
authors.lastname: Lü
authors.forename: Shunsheng
authors.initials: S
authors.lastname: Zhao
authors.forename: Xiangrong
authors.initials: X
authors.lastname: Liu