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The title compound, C22H17N3O4, was prepared through 1,3-dipolar cycloaddition: the dihedral angle between the benzimidazole and benzene rings is 80.93 (6)°. The crystal structure is stabilized by weak π–π interactions between the planar pyrrolobenzimidazole rings (r.m.s. deviation = 0.0293 Å) of neighbouring molecules, forming chains along the c axis. The perpendicular distance is 3.47 (2) Å and the centroid–centroid distances are in the range of 3.590 (3)–3.944 (3) Å.