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In the title compound, C23H20N2O4S2, the central pyrrolidine ring adopts an envelope conformation with the spiro C atom, shared with the benzo-thio-phene ring system, as the flap. The thia-zole ring has a twisted conformation on the S-C bond, where the C atom is that closest to methine C atom. The mean planes of the benzo-thio-phene and indoline ring systems are inclined to the mean plane of the central pyrrolidine ring by 82.75 (8) and 80.03 (8)°, respectively, and to each other by 61.49 (6)°. In the crystal, mol-ecules are linked via pairs of N-H⋯O hydrogen bonds, forming inversion dimers with an R 2 (2)(8) ring motif. The dimers are linked via C-H⋯O and C-H⋯N hydrogen bonds, forming a three-dimensional structure. The eth-oxy-carbonyl group is disordered over two orientations, with an occupancy ratio of 0.717 (12):0.283 (12).

acta crystallographica. section e, crystallographic communications

Crystal structure of ethyl 2′′,3-dioxo-7′,7a'-dihydro-1′H,3H,3′H-dispiro[benzo[b]thiophene-2,6′-pyrrolo[1,2-c]thiazole-5′,3′′-indoline]-7′-carboxylate