The authors describe in full the elucidation of complete structures of guaianolide and germacranolide lactones, isolated from some species of genera Centaurea L., Chartolepis CASS. and others belonging to subtribe Centaureinae DUMORT. The structures were determined mainly on the basis of detailed analysis of 1H NMR and CD spectra. The structure of linichlorin B (XV) was determined by X-ray diffraction analysis.
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Buděšı́nský et al. (1994) studied this question.
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