Ethyl 4-cyano-7-nitro-1,2,3,3a,4,5-hexahydropyrrolo[1,2-a]quinoline-4-carboxylate

In the title compound, C16H17N3O4, the six-membered N-containing ring adopts a half-chair conformation. One C atom of the five-membered ring is disordered over two sites, with occupancy factors of ca 0.67 and 0.33. The major pyrroline component adopts a half-chair conformation. Intermolecular C—H...O hydrogen bonds forming centrosymmetric dimers are observed in the crystal.