{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,1,14]],"date-time":"2025-01-14T05:12:17Z","timestamp":1736831537120,"version":"3.33.0"},"reference-count":7,"publisher":"International Union of Crystallography (IUCr)","issue":"9","license":[{"start":{"date-parts":[[2014,8,1]],"date-time":"2014-08-01T00:00:00Z","timestamp":1406851200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/uk\/legalcode"},{"start":{"date-parts":[[2014,8,1]],"date-time":"2014-08-01T00:00:00Z","timestamp":1406851200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/uk\/legalcode"}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr E Struct Rep Online","Acta Crystallogr E","Acta Cryst E","Acta Cryst E Struct Rep Online","Acta Cryst Sect E","Acta Cryst Sect E Struct Rep Online","Acta Crystallogr Sect E","Acta Crystallogr Sect E Struct Rep Online"],"published-print":{"date-parts":[[2014,9,1]]},"abstract":"<jats:p>In the title compound, C<jats:sub>13<\/jats:sub>H<jats:sub>14<\/jats:sub>N<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub>, the C<jats:sub>5<\/jats:sub>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\u2005\u00c5). The dihedral angle between the five-membered rings is 89.66\u2005(10)\u00b0. In the crystal, inversion-related molecules are connected<jats:italic>via<\/jats:italic>{...HNCO}<jats:sub>2<\/jats:sub>synthons. These are linked into a helical supramolecular chain along [010] by C\u2014H...O interactions.<\/jats:p>","DOI":"10.1107\/s1600536814017097","type":"journal-article","created":{"date-parts":[[2014,8,1]],"date-time":"2014-08-01T09:44:47Z","timestamp":1406886287000},"page":"o954-o954","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["Crystal structure of 1-ethylspiro[imidazolidine-4,1\u2032-indane]-2,5-dione"],"prefix":"10.1107","volume":"70","author":[{"given":"Wahraan Mohammed","family":"Hussein","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cynthia E.","family":"Theodore","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S. 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