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14 C and 2H Labelling experiments together with 2H n.m.r. spectroscopy show that 3,5-dimethylorsellinic acid is a specific precursor of austin and terretonin in Aspergillus ustus and Aspergillus terreus respectively and so substantiate the mixed polyketide–terpenoid origin proposed for these metabolites from the incorporation of 13C-labelled simple precursors.
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McIntyre et al. (1982) studied this question.
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