DL-Methyl 4-(4-methoxyphenyl)-2,7,7-trimethyl-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate

In the title compound, C(21)H(25)NO(4), the dihydropyridine ring adopts a flattened boat conformation. The N atom and the sp(3) C atom deviate in the same direction from the mean plane of the other four C atoms, by 0.269 (6) and 0.111 (6) Å, respectively. This mean plane is inclined to the 4-methoxy-phenyl ring by 87.3 (5)°. The cyclohexenone ring has a sofa conformation with the C atom bearing the methyl groups deviating from the mean plane through the other five C atoms by 0.628 (6) Å. There is a short C-H⋯O hydrogen bond in the molecule. In the crystal, molecules are linked by an N-H⋯O hydrogen bond to form chains propagating along the c-axis direction.