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In the title compound, C25H23FN2O4S, the fused piperidine ring of the octa-hydro-indolizine ring system adopts a chair conformation and the five-membered ring has a twisted conformation on the N-C(spiro) bond. The mean planes of the benzo-thio-phene and indoline ring systems are inclined to the mean plane of the pyrrolidine ring by 83.1 (1) and 84.9 (1)°, respectively, and to each other by 29.37 (17)°. 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 hydrogen bonds, forming slabs lying parallel to (100). The packing between the slabs features a short [2.734 (2) Å] F⋯F contact.

acta crystallographica. section e, crystallographic communications

Crystal structure of ethyl 5′′-fluoro-2′′,3-dioxo-6′,7′,8′,8a'-tetrahydro-2′H,3H,5′H-dispiro[benzo[b]thiophene-2,1′-indolizine-3′,3′′-indoline]-2′-carboxylate