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.
C. R. McIntyre, T. J. Simpson, D. J. Stenzel, A. J. Bartlett, E. Q'Brien and J. S. E. Holker, J. Chem. Soc., Chem. Commun., 1982, 781 DOI: 10.1039/C39820000781
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