{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,1,14]],"date-time":"2025-01-14T05:17:56Z","timestamp":1736831876018,"version":"3.33.0"},"reference-count":6,"publisher":"International Union of Crystallography (IUCr)","issue":"10","license":[{"start":{"date-parts":[[2015,9,12]],"date-time":"2015-09-12T00:00:00Z","timestamp":1442016000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/uk\/legalcode"},{"start":{"date-parts":[[2015,9,12]],"date-time":"2015-09-12T00:00:00Z","timestamp":1442016000000},"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 Cryst Commun","Acta Cryst E","Acta Cryst Sect E","Acta Crystallogr E","Acta Crystallogr Sect E","Acta Cryst E Cryst Commun","Acta Cryst Sect E Cryst Commun"],"published-print":{"date-parts":[[2015,10,1]]},"abstract":"<jats:p>The title compound, C<jats:sub>13<\/jats:sub>H<jats:sub>13<\/jats:sub>N<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>, a hydantoin derivative, crystallized with two molecules (<jats:italic>A<\/jats:italic>and<jats:italic>B<\/jats:italic>) in an asymmetric unit. In molecule<jats:italic>A<\/jats:italic>, the imidazolidine ring is twisted about the C\u2014N bond involving the spiro C atom, while in molecule<jats:italic>B<\/jats:italic>this ring is flat (r.m.s. deviation = 0.010\u2005\u00c5). The pyran rings in both molecules have distorted half-chair conformations. The mean plane of the imidazolidine ring is inclined to the aromatic ring of the chroman unit by 79.71\u2005(11)\u00b0 in molecule<jats:italic>A<\/jats:italic>and 82.83\u2005(12)\u00b0 in molecule<jats:italic>B<\/jats:italic>. In the crystal, pairs of N\u2014H...O hydrogen bonds link the individual molecules to form<jats:italic>A<\/jats:italic>\u2013<jats:italic>A<\/jats:italic>and<jats:italic>B<\/jats:italic>\u2013<jats:italic>B<\/jats:italic>inversion dimers. The dimers are linked<jats:italic>via<\/jats:italic>N\u2014H...O and C\u2014H...O hydrogen bonds, forming sheets lying parallel to the<jats:italic>bc<\/jats:italic>plane,<jats:italic>viz.<\/jats:italic>(011). Within the sheets, the<jats:italic>A<\/jats:italic>and<jats:italic>B<\/jats:italic>molecules are linked by C\u2014H...\u03c0 interactions.<\/jats:p>","DOI":"10.1107\/s2056989015016175","type":"journal-article","created":{"date-parts":[[2015,9,22]],"date-time":"2015-09-22T19:25:42Z","timestamp":1442949942000},"page":"o705-o706","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":0,"title":["Crystal structure of 1\u2032-ethylspiro[chroman-4,4\u2032-imidazolidine]-2\u2032,5\u2032-dione: a hydantoine derivative"],"prefix":"10.1107","volume":"71","author":[{"given":"S. B.","family":"Benaka Prasad","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S.","family":"Naveen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Madaiah","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"N. 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