An unusual acid: (+/-)-3-benzoyl-1,2-dimethyl-8a-phenyl-2-benzothieno[2,3-b]pyrrole-1,2-dicarboxylic anhydride

Acta Crystallogr C. 2005 Oct;61(Pt 10):o610-2. doi: 10.1107/S010827010502874X. Epub 2005 Sep 30.

Abstract

The title compound, C27H21NO4S, is a 2-benzothieno[2,3-b]pyrrole derivative with several substituents, present in the crystal as a racemate. The tetracyclic fused-ring system shows a 'U-shaped' molecular architecture, since the two rings flanking the central pyrrolidine ring both point in the same direction.