1-Amino-6-chloro-2-(1H-pyrrol-2-yl)­benz­imidazole (RS 1350)

The title compound (RS 1350), C₁₁H₉ClN₄, was recently synthesized by a Smiles rearrangement of 1-[(5-chloro-2-nitro­phenyl)­sulfonyl]-1H-pyrrole-2-carbohydrazide or 1-(5-chloro-2-nitro­phenyl)-1H-pyrrole-2-carbohydrazide in pow­der­ed iron–glacial acetic acid medium. From the crystallographic analysis, it is observed that, in the title compound, the benz­imidazole moiety is planar and forms a dihedral angle of 3.8 (2)° with the pyrrole ring. The near planarity of the two rings indicates an extended conjugation.