2-(6-Bromo­benzo[d]thia­zol-2-yl)-5,5-di­methyl­thia­zol-4(5H)-one

The title compound, C₁₂H₉BrN₂OS₂, was obtained by reacting 6-bromo­benzo[d]thia­zole-2-carbo­nitrile in iso-propanol with ethyl 2-mercapto-2-methyl­propano­ate at reflux temperature for several hours. The resulting di­methyl­oxyluciferin derivative shows partial double-bond character of the carbon-carbon bond between the two heterocyclic moieties [C-C = 1.461 (3) Å]. This double bond restricts rotation around this C-C axis, therefore leading to an almost planar mol­ecular structure [N-C-C-S torsion angle = 9.7 (3)°]. The five-membered thiazoline ring is not completely planar as a result of the bulky S atom [C-S-C-C torsion angle = 5.17 (12)°].