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The title compound, C8H4ClNO2Te, represents the first reported example of a benzofuran-derived 2,1,3-benzoxa­tellurazole derivative. While it can be formally described as a nitroso­aryl­tellurium monochloride, its Te-O and Te-C bond lengths of 2.1421 (14) and 2.0374 (17) Å, respectively, characterize it as a planar tricyclic aromatic containing a Te=C double bond. Its formation suggests that derivatives of 2-cyclo­hexenone oxime in general react with tellurium dioxide to form aryl-2,1,3-benzoxatellurazoles.

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A second, monoclinic, polymorph of the title compound, C14H8Cl2, has been found. In addition to the structure of this monoclinic form, the structure of the previously described ortho­rhom­bic form [Desvergne, Chekpo & Bouas-Laurent (1978). J. Chem. Soc. Perkin Trans. 2, pp. 84–87; Benites, Maverick & Fronczek (1996). Acta Cryst. C52, 647–648] has been redetermined at low temperature and using modern methods. The low-temperature structure of the ortho­rhom­bic form is of significantly higher quality than the previously published structure and additional details can be derived. A comparison of the crystal packing of the two forms with a focus on weak inter­molecular C—H...Cl inter­actions shows the monoclinic structure to have one such inter­action linking the mol­ecules into infinite ribbons, while two crystallographically independent C—H...Cl interactions give rise to an inter­esting infinite three-dimensional network in the ortho­rhom­bic crystal form.

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Glabridin is a species-specific biomarker from the roots Glycyrrhiza glabra L. (European licorice, Fabaceae). Stereochemical analysis, including circular dichroism, NMR data and an X-ray diffraction data set with Bijvoet differences, confirms that glabridin, purified from its natural source, is found only in a C3 R configuration.
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