title: 3-Phenyl-2-(piperidin-1-yl)-3,5,6,8-tetra-hydro-4H-thio-pyrano[3',4':2,3]thieno[5,4-d]pyrimidin-4-one.
abstract: In the title compound, C(20)H(21)N(3)OS(2), the piperidinyl ring has a distorted chair conformation. Weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers. The crystal packing exhibits short inter-molecular S⋯S distances of 3.590 (2) Å.
authors.affiliation: College of Chemistry and Chemical Engineering, ShanXi Datong University, Datong, Shanxi 037009, People's Republic of China.
authors.forename: Hai
authors.initials: H
authors.lastname: Xie
authors.forename: Shuang-Ming
authors.initials: SM
authors.lastname: Meng
authors.forename: Yue-Qin
authors.initials: YQ
authors.lastname: Fan
authors.forename: Yong
authors.initials: Y
authors.lastname: Guo