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The title molecule, formed by spontaneous dehydration of 2'-hydroxywarfarin, is a cyclic ketal in which the side-chain phenyl is disposed pseudoaxially and is linked through a 2'-oxygen to the ketal carbon in a fixed cis 1,3-diaxial configuration. Two dihydropyran rings are formed; one fused with the benzopyran ring adopts an e,ƒ-diplanar conformation, the other is a chroman and is in a similar conformation."},{"label":"DOI","value":"10.1107/S010827018900079X"},{"label":"Volume","value":"45"},{"label":"Publication Date","value":"D:00 M:00 Y:1981"},{"label":"Publication Information","value":"Copyright 1981 International Union of Crystallography. The original published version of this article may be found at http://dx.doi.org/10.1107/S010827018900079X."}],"description":"Structure of (±)-6-Methyl-6,12-methano-6H,12H,13H-[1]benzopyran[4,3-d][1,3]benzodioxocin-13-one","sequences":[{"@type":"sc:Sequence","canvases":[{"@id":"https://iiif.quartexcollections.com/portland/iiif/dd5e40b8-d529-4f64-91bd-ec6a838db8cd/canvas/_1","@type":"sc:Canvas","label":"Structure of (±)-6-Methyl-612-methano-6H 12H 13-2","height":1458,"width":1083,"images":[{"@type":"oa:Annotation","motivation":"sc:painting","resource":{"@id":"https://iiif.quartexcollections.com/portland/iiif/cae72dab-a7e8-4e75-9e49-6bbdd327be7b/full/full/0/default.jpg","@type":"dctypes:Image","format":"image/jpeg","service":{"@context":"http://iiif.io/api/image/2/context.json","@id":"https://iiif.quartexcollections.com/portland/iiif/cae72dab-a7e8-4e75-9e49-6bbdd327be7b","profile":"http://iiif.io/api/image/2/level2.json","tiles":[{"width":512,"scaleFactors":[1,2,4]}]},"height":1458,"width":1083},"on":"https://iiif.quartexcollections.com/portland/iiif/dd5e40b8-d529-4f64-91bd-ec6a838db8cd/canvas/_1","metadata":[]}],"thumbnail":{"@id":"https://iiif.quartexcollections.com/portland/iiif/cae72dab-a7e8-4e75-9e49-6bbdd327be7b/full/500,500/0/default.jpg","@type":"dctypes:Image","height":500,"width":500}},{"@id":"https://iiif.quartexcollections.com/portland/iiif/dd5e40b8-d529-4f64-91bd-ec6a838db8cd/canvas/_2","@type":"sc:Canvas","label":"Structure of (±)-6-Methyl-612-methano-6H 12H 13-3","height":1464,"width":1057,"images":[{"@type":"oa:Annotation","motivation":"sc:painting","resource":{"@id":"https://iiif.quartexcollections.com/portland/iiif/24b14f9e-4d33-4f91-b4ec-896ba7b03514/full/full/0/default.jpg","@type":"dctypes:Image","format":"image/jpeg","service":{"@context":"http://iiif.io/api/image/2/context.json","@id":"https://iiif.quartexcollections.com/portland/iiif/24b14f9e-4d33-4f91-b4ec-896ba7b03514","profile":"http://iiif.io/api/image/2/level2.json"},"height":1464,"width":1057},"on":"https://iiif.quartexcollections.com/portland/iiif/dd5e40b8-d529-4f64-91bd-ec6a838db8cd/canvas/_2","metadata":[]}],"thumbnail":{"@id":"https://iiif.quartexcollections.com/portland/iiif/24b14f9e-4d33-4f91-b4ec-896ba7b03514/full/500,500/0/default.jpg","@type":"dctypes:Image","height":500,"width":500}},{"@id":"https://iiif.quartexcollections.com/portland/iiif/dd5e40b8-d529-4f64-91bd-ec6a838db8cd/canvas/_3","@type":"sc:Canvas","label":"Structure of (±)-6-Methyl-612-methano-6H 12H 13-4","height":1471,"width":1102,"images":[{"@type":"oa:Annotation","motivation":"sc:painting","resource":{"@id":"https://iiif.quartexcollections.com/portland/iiif/76a6e0d4-dcef-4b67-b18c-f0218c56e184/full/full/0/default.jpg","@type":"dctypes:Image","format":"image/jpeg","service":{"@context":"http://iiif.io/api/image/2/context.json","@id":"https://iiif.quartexcollections.com/portland/iiif/76a6e0d4-dcef-4b67-b18c-f0218c56e184","profile":"http://iiif.io/api/image/2/level2.json"},"height":1471,"width":1102},"on":"https://iiif.quartexcollections.com/portland/iiif/dd5e40b8-d529-4f64-91bd-ec6a838db8cd/canvas/_3","metadata":[]}],"thumbnail":{"@id":"https://iiif.quartexcollections.com/portland/iiif/76a6e0d4-dcef-4b67-b18c-f0218c56e184/full/500,500/0/default.jpg","@type":"dctypes:Image","height":500,"width":500}}]}],"thumbnail":"https://iiif.quartexcollections.com/portland/iiif/cae72dab-a7e8-4e75-9e49-6bbdd327be7b/full/300,300/0/default.jpg","logo":"https://iiif.quartexcollections.com/portland/iiif/logo"}