A sesquiterpene lactone, onopordopicrin [1], has been isolated from Centaurea sonchifolia. Its structure was established by 2D nmr (1H-1H and 13C-1H correlations), and the conformation in CHCl3 was examined by nOe studies. Cytotoxic, antibacterial, and antifungal activities are reported.
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Lonergan et al. (1992) studied this question.
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