(2<i>Z</i>)-3-(4-Chloroanilino)-1-(5-hydroxy-3-methyl-1-phenyl-1<i>H</i>-pyrazol-4-yl)but-2-en-1-one

In the title compound, C(20)H(18)BrN(3)O(2), the central carbonyl group forms amine-N-H⋯O and hy-droxy-O-H⋯O hydrogen bonds, which lead to two fused S(6) rings. The N-bound phenyl ring is coplanar with the five-membered ring to which it is attached [dihedral angle = 5.22 (18)°], but the dihedral angle [33.87 (17)°] between the terminal phenyl and bromo-benzene rings indicates an overall twist in the mol-ecule. In the crystal packing, mol-ecules assemble into dimeric aggregates via C-H⋯π inter-actions.