{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T23:13:58Z","timestamp":1778109238226,"version":"3.51.4"},"reference-count":29,"publisher":"International Union of Crystallography (IUCr)","issue":"3","license":[{"start":{"date-parts":[[2015,2,18]],"date-time":"2015-02-18T00:00:00Z","timestamp":1424217600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html"},{"start":{"date-parts":[[2015,2,18]],"date-time":"2015-02-18T00:00:00Z","timestamp":1424217600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html#TDM"}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr C Struct Chem","Acta Crystallogr C","Acta Crystallogr C Cryst Struct Commun","Acta Cryst C","Acta Cryst C Struct Chem","Acta Cryst Sect C","Acta Cryst Sect C Struct Chem","Acta Crystallogr Sect C","Acta Crystallogr Sect C Struct Chem","Acta Crystallogr Sect C Cryst Struct Commun"],"published-print":{"date-parts":[[2015,3,1]]},"abstract":"<jats:p>Polymorph (I<jats:italic>a<\/jats:italic>) (m.p. 474\u2005K) of the title compound, C<jats:sub>12<\/jats:sub>H<jats:sub>18<\/jats:sub>N<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>, displays an N\u2014H...O=C hydrogen-bonded layer structure which contains<jats:italic>R<\/jats:italic><jats:sub>6<\/jats:sub><jats:sup>6<\/jats:sup>(28) rings connecting six molecules, as well as<jats:italic>R<\/jats:italic><jats:sub>2<\/jats:sub><jats:sup>2<\/jats:sup>(8) rings linking two molecules. The 3-connected hydrogen-bonded net resulting from these interactions has the<jats:bold>hcb<\/jats:bold>topology. Form (I<jats:italic>b<\/jats:italic>) (m.p. 471\u2005K) displays N\u2014H...O=C hydrogen-bonded looped chains in which neighbouring molecules are linked to one another by two different<jats:italic>R<\/jats:italic><jats:sub>2<\/jats:sub><jats:sup>2<\/jats:sup>(8) rings. Polymorph (I<jats:italic>a<\/jats:italic>) is isostructural with the previously reported form II of 5-(2-bromoallyl)-5-isopropylbarbituric acid (noctal) and polymorph (I<jats:italic>b<\/jats:italic>) is isostructural with the known crystal structures of four other barbiturates.<\/jats:p>","DOI":"10.1107\/s2053229615002880","type":"journal-article","created":{"date-parts":[[2015,2,17]],"date-time":"2015-02-17T14:09:05Z","timestamp":1424182145000},"page":"204-210","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":11,"title":["Two polymorphs of 5-cyclohexyl-5-ethylbarbituric acid and their packing relationships with other barbiturates"],"prefix":"10.1107","volume":"71","author":[{"given":"Thomas","family":"Gelbrich","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Isabella","family":"Meischberger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ulrich J.","family":"Griesser","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2015,2,18]]},"reference":[{"key":"cu3074_bb1","doi-asserted-by":"crossref","first-page":"1555","DOI":"10.1002\/anie.199515551","volume":"34","author":"Bernstein","year":"1995","journal-title":"Angew. 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