Crystal structure of ethyl N-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)carbamate

In the title compound, C14H17N3O3, the dihedral angle between the benzene ring and the five-membered dihydropyrazole ring is 52.26 (9)degrees. The ethyl ester group is approximately planar (r. m. s. deviation 0.0568 angstrom) and subtends an angle 67.73 (8)degrees to the pyrazole ring. In the crystal, molecules are linked by pairs of N-H center dot center dot center dot O hydrogen bonds, forming inversion dimers with an R-2(2)(10) ring motif. Weaker C-H center dot center dot center dot O contacts link these dimers into a three-dimensional network of molecules stacked along the a-axis direction. Offset pi-pi stacking interactions between the benzene rings [centroid-to-centroid distance = 3.8832 (12) angstrom] further stabilize the crystal packing.