title: Crystal structure of ethyl 1',5-dimethyl-2'',3-dioxo-3H-di-spiro-[benzo[b]thiophene-2,3'-pyrrolidine-2',3''-indoline]-4'-carboxyl-ate.
abstract: The title compound, C23H22N2O4S, crystallized with two independent mol-ecules (A and B) in the asymmetric unit. They have very similar conformations with the pyrrolidine ring having a twisted conformation, on the Cspiro-Cspiro bond, in both mol-ecules. In mol-ecule A, the mean planes of the benzo-thio-phene and indoline ring systems are inclined to the mean plane of the pyrrolidine ring by 87.59 (10) and 84.51 (11)°, respectively, and to one another by 72.69 (7)°. The corresponding angles in mol-ecule B are 87.15 (10), 84.58 (10) and 72.07 (7)°, respectively. In the crystal, the A and B mol-ecules are linked to one another by two N-H⋯O hydrogen bonds, forming a dimer. These dimers are linked via C-H⋯O hydrogen bonds, forming a three-dimensional structure.
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: benzo­thio­phene; crystal structure; di­spiro; hydrogen bonding; indoline; pyrrolidine
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