Crystal structure of ethyl 2'',3-dioxo-7',7a'-di-hydro-1'H,3H,3'H-di-spiro[benzo[b]thio-phene-2,6'-pyrrolo-[1,2-c]thia-zole-5',3''-indoline]-7'-carboxyl-ate.

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).