{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,1,14]],"date-time":"2025-01-14T05:17:06Z","timestamp":1736831826487,"version":"3.33.0"},"reference-count":14,"publisher":"International Union of Crystallography (IUCr)","issue":"7","license":[{"start":{"date-parts":[[2015,6,27]],"date-time":"2015-06-27T00:00:00Z","timestamp":1435363200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/uk\/legalcode"},{"start":{"date-parts":[[2015,6,27]],"date-time":"2015-06-27T00:00:00Z","timestamp":1435363200000},"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":[[2015,7,1]]},"abstract":"<jats:p>In the title compound, C<jats:sub>23<\/jats:sub>H<jats:sub>14<\/jats:sub>Cl<jats:sub>4<\/jats:sub>N<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>, the pyran ring has an envelope conformation with the methine C atom as the flap. The chromene rings are almost planar (r.m.s. deviations of 0.027 and 0.018\u2005\u00c5) and their mean planes are inclined to one another by 85.61\u2005(10)\u00b0. The mean planes of the pyran ring and the chromene ring fused to it are inclined to one another by 7.41\u2005(13)\u00b0. The molecular structure is stabilized by an intramolecular N\u2014H...O hydrogen bond, generating an<jats:italic>S<\/jats:italic>(6) ring motif. In the crystal, molecules are linked by pairs of N\u2014H...O hydrogen bonds, forming inversion dimers with an<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup><jats:sub>2<\/jats:sub>(12) ring motif. The dimers are linked by pairs of C\u2014H...O hydrogen bonds, enclosing<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup><jats:sub>2<\/jats:sub>(18) ring motifs, forming chains along [010]. Within the chains there are C\u2014H...\u03c0 interactions. The chains are linked<jats:italic>via<\/jats:italic>slipped parallel \u03c0\u2013\u03c0 interactions, forming a three-dimensional structure [the shortest inter-centroid distance is 3.7229\u2005(19)\u2005\u00c5].<\/jats:p>","DOI":"10.1107\/s2056989015011810","type":"journal-article","created":{"date-parts":[[2015,6,26]],"date-time":"2015-06-26T08:18:23Z","timestamp":1435306703000},"page":"o512-o513","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["Crystal structure of 4-(6-chloro-4-oxo-4<i>H<\/i>-chromen-3-yl)-2-methylamino-3-nitro-4<i>H<\/i>,5<i>H<\/i>-pyrano[3,2-<i>c<\/i>]chromen-5-one chloroform monosolvate"],"prefix":"10.1107","volume":"71","author":[{"given":"Rajamani","family":"Raja","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Subramani","family":"Kandhasamy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paramasivam T.","family":"Perumal","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A.","family":"SubbiahPandi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2015,6,27]]},"reference":[{"key":"su5158_bb1","doi-asserted-by":"crossref","first-page":"3248S3254S","DOI":"10.1093\/jn\/133.10.3248S","volume":"133","author":"Beecher","year":"2003","journal-title":"J. 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