1-Formyl-r-2,c-6-bis­(4-methoxy­phen­yl)-t-3-methyl­piperidin-4-one

The asymmetric unit of the title compound, C(21)H(23)NO(4), contains two crystallographically independent mol­ecules A and B. In both mol­ecules, the piperidine-4-one rings adopt a distorted twist-boat conformation. The formyl group at position 1, the methoxy­phenyl ring at position 2 and the methyl group at position 3 are attached equatorially. The meth­oxy phenyl ring at position 6 has an axial orientation. The dihedral angle between the two benzene rings is 55.27 (8)° in mol­ecule A, and 55.29 (8)° in mol­ecule B. In the crystal, the mol­ecules are linked by weak C—H⋯O inter­molecular hydrogen-bond inter­actions. In addition, weak C—H⋯π inter­molecular inter­actions involving the benzene rings at positions 6 and 2 of mol­ecule B are also found in the crystal structure.