Acta Cryst. (2008). E64, o1954  [ doi:10.1107/S1600536808029085 ]

(S)-(-)-6-(4-Bromophenyl)-2,3,5,6-tetrahydrothiazolo[2,3-b]imidazolium hydrogen oxalate

T. Minor and M. Chruszcz

Abstract: The structure of the title compound, C₁₁H₁₂BrN₂S⁺·C₂HO₄^- (common name 6-bromolevamisole hydrogen oxalate), is stabilized mainly by hydrogen bonds. Hydrogen oxalate anions form parallel coplanar chains via O-HO hydrogen bonds, while there are N-HO hydrogen-bonding interactions between the 6-bromolevamisole cations and oxalate anions. Both five-membered rings from the 6-bromolevamisole molecule have a twist conformation. The molecule has an extended conformation, with the 4-bromophenyl substituent positioned equatorially with N-C-C-C and C-C-C-C torsion angles of 39.8 (3) and 100.4 (3)°, respectively.

Online 17 September 2008

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