title: Crystal structure of ethyl 5''-fluoro-2'',3-dioxo-6',7',8',8a'-tetra-hydro-2'H,3H,5'H-di-spiro-[benzo[b]thio-phene-2,1'-indol-izine-3',3''-indoline]-2'-carboxyl-ate.
abstract: 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.
authors.affiliation: Department of Physics, Presidency College (Autonomous), Chennai 600 005, India.
authors.forename: R
authors.initials: R
authors.lastname: Raja
authors.affiliation: Department of Physics, Pachaiyappa's College for Men, Kanchipuram 631 501, India.
authors.forename: J
authors.initials: J
authors.lastname: Govindaraj
authors.affiliation: Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 602 025, India.
authors.forename: M
authors.initials: M
authors.lastname: Suresh
authors.affiliation: Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 602 025, India.
authors.forename: R
authors.initials: R
authors.lastname: Raghunathan
authors.affiliation: Department of Physics, Presidency College (Autonomous), Chennai 600 005, India.
authors.forename: A
authors.initials: A
authors.lastname: SubbiahPandi
keywords: F⋯F inter­actions; benzo­thio­phene; crystal structure; di­spiro; hydrogen bonds; indoline; indolizine
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