(1′S,4′S)-5-(2,5-Dimethyl­phen­yl)-4′-meth­oxy-6-oxa-3-aza­spiro­[bicyclo­[3.1.0]hexane-2,1′-cyclo­hexa­n]-4-one

In the title compound, C(18)H(23)NO(3), the cyclo­hexane ring has a chair conformation. The oxirane plane (OCC) makes a dihedral angle of 76.15 (13)° with that of the pyrrolidine ring to which it is fused. The mean plane of the cyclo­hexane ring and the benzene ring are almost normal to the pyrrolidine ring, with dihedral angles of 88.47 (8) and 77.85 (8)°, respectively. In the crystal, mol­ecules are linked via pairs of N—H⋯O hydrogen bonds, forming inversion dimers. These dimers are linked via pairs of C—H⋯O hydrogen bonds, forming chains along the a-axis direction.