Two crystalline compounds urospermal A and B, isolated from Urospermum dalechampii, are interconvertible in solution, and evidence is presented which indicates that they are conformers of the germacranolide aldehyde (II) or its mirror image.
R. K. Bentley, J. G. St. C. Buchanan, T. G. Halsall and V. Thaller, J. Chem. Soc. D, 1970, 435 DOI: 10.1039/C29700000435
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