title: 5-Methyl-1,2,3,3a-tetra-hydro-benzo[e]pyrrolo-[2,1-b][1,3]oxazepin-10(5H)-one.
abstract: The asymmetric unit of the title compound, C(13)H(15)NO(2), the main product of a photoreaction, contains two crystallographically independent mol-ecules. In both mol-ecules, the conformation of the seven-membered ring is twist sofa and that of the five-membered rings is envelope. In the crystal, mol-ecules are linked by weak inter-molecular C-H⋯O hydrogen bonds.
authors.affiliation: Chemistry Department, Tongji University, Shanghai 200092,  People's Republic of China.
authors.forename: Yun-Zhou
authors.initials: YZ
authors.lastname: Jin
authors.forename: Rong-Hua
authors.initials: RH
authors.lastname: Zhang
authors.forename: Da-Xu
authors.initials: DX
authors.lastname: Fu
authors.forename: Yao-Kang
authors.initials: YK
authors.lastname: Lv
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