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Solution of the structure was by direct methods, and refinement by least-squares calculations led to a conventional R of 0·053 (Mo Kα data). The molecule crystallizes as the intramolecular hemiketal and thus may be described as (2S,4S)-2,3H-2-methyl-4-phenyl-5-oxobenzopyrano[3,4-e]dihydropyran-2-ol. The absolute configuration was confirmed by recollecting with Cu Kα radiation a group of reflect ions predicted to have the greatest observable Bijvoet differences based on the anomalous scattering of oxygen and the parameters from the refinement with Mo Kα data. A group of 51 Friedel pairs, 86% of which indicate the S enantiomer, gave a 17% decrease in the residual over the R enantiomer. Refinement of the imaginary part of the anomalous dispersion of oxygen gave a value of 0·037 for Δf\"."},{"label":"DOI","value":"10.1107/S056774087500427X"},{"label":"Volume","value":"B31"},{"label":"Publication Date","value":"D:00 M:00 Y:1975"}],"description":"The Crystal and Molecular Structure and Absolute Configuration of (—)-(S)-Warfarin","sequences":[{"@type":"sc:Sequence","canvases":[{"@id":"https://iiif.quartexcollections.com/portland/iiif/7f0af29e-179a-4253-ab99-ae1bf5177653/canvas/_1","@type":"sc:Canvas","label":"The Crystal and Molecular Structure and Absolute Configuration 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