title: (2Z)-3-(4-Chloro-anilino)-1-(5-hy-droxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)but-2-en-1-one.
abstract: With the exception of the terminal benzene rings, the atoms in the title compound, C(20)H(18)ClN(3)O(2), are approximately coplanar (r.m.s. deviation = 0.0495 Å). The benzene/chloro-benzene rings form dihedral angles of 3.02 (4) and 41.59 (5)°, respectively, with this plane. The hy-droxy, amino and carbonyl groups all lie to the same side of the mol-ecule, enabling the formation of intra-molecular O-H⋯O and N-H⋯O hydrogen bonds that close S(6) rings. The configuration about the 2-butene bond is Z. Supra-molecular chains mediated by C-H⋯Cl inter-actions and aligned along the c axis are found in the crystal packing. These assemble into layers that are connected by weak π-π inter-actions between centrosymmetrically related chloro-benzene rings [3.8156 (9) Å].
authors.forename: Abdullah M
authors.initials: AM
authors.lastname: Asiri
authors.forename: Abdulrahman O
authors.initials: AO
authors.lastname: Al-Youbi
authors.forename: Khalid A
authors.initials: KA
authors.lastname: Alamry
authors.forename: Hassan M
authors.initials: HM
authors.lastname: Faidallah
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677