title: 3,4-Dihydro-1,4-benzothia-zepin-5(2H)-one.
abstract: In the mol-ecule of the title compound, C(9)H(9)NOS, the seven-membered ring has a twist conformation. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers.
authors.forename: Zhi-Long
authors.initials: ZL
authors.lastname: Chen
authors.forename: Feng
authors.initials: F
authors.lastname: Hong
authors.forename: Sheng-Yin
authors.initials: SY
authors.lastname: Zhao