title: (1'S,4'S)-5-(2,5-Dimethyl-phen-yl)-4'-meth-oxy-6-oxa-3-aza-spiro-[bicyclo-[3.1.0]hexane-2,1'-cyclo-hexa-n]-4-one.
abstract: In the title compound, C18H23NO3, the cyclo-hexane 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 cyclo-hexane 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, mol-ecules 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.
authors.affiliation: College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China.
authors.forename: Xing-Rui
authors.initials: XR
authors.lastname: He
authors.forename: Bing-Rong
authors.initials: BR
authors.lastname: Xu
authors.forename: Jing-Li
authors.initials: JL
authors.lastname: Cheng
authors.forename: Jin-Hao
authors.initials: JH
authors.lastname: Zhao