(Z)-3-Methyl-4-[1-(4-methyl-anilino)propyl-idene]-1-phenyl-1H-pyrazol-5(4H)-one.

In the title mol-ecule, C20H21N3O, the central pyrazole ring forms dihedral angles of 4.75 (9) and 49.11 (9)°, respectively, with the phenyl and methyl-substituted benzene rings. The dihedral angle between the phenyl and benzene rings is 51.76 (8)°. The amino group and carbonyl O atom are involved in an intra-molecular N-H⋯O hydrogen bond. In the crystal, π-π inter-actions are observed between benzene rings [centroid-centroid seperation = 3.892 (2) Å] and pyrazole rings [centroid-centroid seperation = 3.626 (2) Å], forming chains along [111]. The H atoms of the methyl group on the p-tolyl substituent were refined as disordered over two sets of sites in a 0.60 (4):0.40 (4) ratio.