title: Crystal structure of 1-ethyl-spiro-[imid-az-olidine-4,1'-indane]-2,5-dione.
abstract: In the title compound, C13H14N2O2, the C5 ring has an envelope conformation with the C atom adjacent to the quaternary C being the flap. The five atoms comprising the imidazolidine-2,4-dione ring are almost planar (r.m.s. deviation = 0.004 Å). The dihedral angle between the five-membered rings is 89.66 (10)°. In the crystal, inversion-related mol-ecules are connected via {⋯HNCO}2 synthons. These are linked into a helical supra-molecular chain along [010] by C-H⋯O inter-actions.
authors.affiliation: Department of Studies in Physics, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: Wahraan Mohammed
authors.initials: WM
authors.lastname: Hussein
authors.affiliation: Department of Chemistry, School of Engineering and Technology, Jain University, Bangalore 562 112, India.
authors.forename: Cynthia E
authors.initials: CE
authors.lastname: Theodore
authors.affiliation: Department of Chemistry, School of Engineering and Technology, Jain University, Bangalore 562 112, India.
authors.forename: S B
authors.initials: SB
authors.lastname: Benaka Prasad
authors.affiliation: Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: M
authors.initials: M
authors.lastname: Madaiah
authors.affiliation: Institution of Excellence, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: S
authors.initials: S
authors.lastname: Naveen
authors.affiliation: Department of Studies in Physics, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: N K
authors.initials: NK
authors.lastname: Lokanath
keywords: C—H⋯O inter­actions; crystal structure; helical supra­molecular chain; hydantoin derivatives; spiro compounds; {⋯HNCO}2 synthons