Centaurepensin, an unusual guaianolide sesquiterpene lactone ester containing two chlorine atoms was isolated from Centaurea repens and its structure and absolute configuration were determined by X-ray diffraction methods.
J. Harley-Mason, A. T. Hewson, O. Kennard and R. C. Pettersen, J. Chem. Soc., Chem. Commun., 1972, 460 DOI: 10.1039/C39720000460
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