Ethyl 4-(5-chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)-6-methyl-2-oxo-1,2,3,4-tetra­hydro­pyrimidine-5-carboxyl­ate

In the title compound, C(18)H(19)ClN(4)O(3), the dihydro­pyrimidin­one ring adopts a flattened boat conformation. The dihedral angle between the phenyl and pyrazole rings is 43.39 (6)°. An intra­molecular C—H⋯O contact generates an S(8) ring motif that stabilizes the mol­ecular conformation and precludes the carbonyl O atom of the ester group from forming inter­molecular inter­actions. Mol­ecules are linked into centrosymmetric dimers by pairs of N—H⋯O hydrogen bonds and the dimers are linked into infinite chains along [101] by N—H⋯N hydrogen bonds.