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In the title compound, C21H25NO3·C2H4O2, the piperidone ring adopts a chair conformation. The two meth­oxy groups are nearly coplanar with the aromatic rings to which they are attached. The dihedral angle between the two aromatic rings is 60.9 (2)°. There are two short intra­molecular N—H...O contacts. The crystal packing is stabilized by inter­molecular O—H...N and C—H...O inter­actions.

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In the title compound, C20H20BrNO2, the piperidone ring adopts a boat conformation. The phenyl rings are oriented at dihedral angles of 97.8 (2) and 96.0 (1)° with respect to the best plane through the piperidine ring. The dihedral angle between the two phenyl rings is 49.7 (1)°. In the crystal, bifurcated C—H...O hydrogen bonds form a R21(7) ring motif, linking the mol­ecules into centrosymmetric dimers.
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