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

In the title compound, C(23)H(20)N(2)O(4)S(2), the central pyrrolidine ring adopts an envelope conformation with the spiro C atom, shared with the benzo­thio­phene ring system, as the flap. The thia­zole 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 benzo­thio­phene 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, mol­ecules 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 eth­oxy­carbonyl group is disordered over two orientations, with an occupancy ratio of 0.717 (12):0.283 (12).