Incorporation of [2-14C]malonate and [1-13C]acetate by an entomogenous strain of Aspergillus flavus into the dihydroisocoumarin asperentin gives a labelling pattern consistent with its formation from a polyketide precursor assembled from one acetate- and seven malonate-derived two-carbon units. A technique for minimising the Overhauser enhancement in 13C n.m.r. spectroscopy is described.
L. Cattel, J. F. Grove and D. Shaw, J. Chem. Soc., Perkin Trans. 1, 1973, 2626 DOI: 10.1039/P19730002626
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