Synthesis and structure of 4-{[(E)-(7-meth-oxy-1,3-benzodioxol-5-yl)methyl-idene]amino}-1,5-dimethyl-2-phenyl-2,3-di-hydro-1H-pyrazol-3-one.

In the title compound, C20H19N3O4, the dihedral angles between the central pyrazole ring and the pendant phenyl and substituted benzene rings are 50.95 (8) and 3.25 (12)°, respectively, and an intra-molecular C-H⋯O link generates an S(6) ring. The benzodioxolyl ring adopts a shallow envelope conformation with the methyl-ene C atom as the flap. In the crystal, the mol-ecules are linked by non-classical C-H⋯O inter-actions, which generate a three-dimensional network. Solvent-accessible voids run down the c-axis direction and the residual electron density in these voids was modelled during the refinement process using the SQUEEZE algorithm [Spek (2015 ▸). Acta Cryst. C71, 9-18] within the structural checking program PLATON.