title: 6-Amino-8-(2-bromo-phen-yl)-1,7,8,8a-tetrahydro-3H-isothio-chromene-5,7,7-tricarbonitrile dimethyl-formamide solvate.
abstract: In the title compound, C(18)H(13)BrN(4)S·C(3)H(7)NO, the thio-pyran ring and the adjacent six-numbered ring adopt distorted boat conformations. The mol-ecules, lying about inversion centers, form hydrogen-bonded dimers involving one of the H atoms on the amino group with the N atom of a cyano group of an adjacent mol-ecule, resulting in a 12-membered ring system [R(2) (2)(12) ring motif]. The other H atom of the amino group forms an inter-molecular hydrogen bond with the O atom of the dimethyl-formamide (DMF) mol-ecule. Another lone pair of electrons on the same carbonyl O atom of DMF mol-ecule forms a non-classical C-H⋯O inter-molecular hydrogen bond, resulting in a chain of mol-ecules.
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Zhang
authors.forename: Jian-Rong
authors.initials: JR
authors.lastname: Wu
authors.forename: Xiang-Shan
authors.initials: XS
authors.lastname: Wang