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The title mol­ecule, C 22 H 23 N 3 O 2 , was obtained  via  an intra­molecular cyclo­addition of an azomethine ylide and an alkene tethered by a benzimidazole unit. The benzoimidazole unit is essentially planar, with an r.m.s. deviation of 0.0087 Å from the nine constituent atoms. It has a  cis  fusion of the two pyrrolidine rings as well as a  cis  ester appendage. The two pyrrolidine rings rings have envelope conformations. The crystal packing is stabilized by aromatic π–π stacking of parallel benzimidazole ring systems, with a centroid-to-centroid distance of 3.518 (6) Å. Weak inter­molecular C—H⋯O contacts may also play a role in the stability of the packing.

Ethyl 1-benzyl-1,2,3,3a,4,10b-hexahydropyrrolo[2′,3′:3,4]pyrrolo[1,2-a]benzimidazole-2-carboxylate