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HPLC-SPE-NMR analysis of a chemically complex antimycobacterial fraction of Warburgia salutaris allowed the rapid identification of seven new and four known drimane- and coloratane-type sesquiterpenes. This recently introduced hyphenated technique is therefore a highly valuable tool for elucidation of the chemistry of biologically active fractions of natural origin.
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Clarkson et al. (2007) studied this question.
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