The 13C n.m.r. spectra of xanthomegnin (1) and related compounds [(2)–(5), (7), and (9)] have been assigned. Spectra of xanthomegnin and viomellein biosynthesised from singly and doubly 13C-labelled acetate confirm the polyketide origin of these metabolites and provide additional evidence for the structures proposed for the pigments.
T. J. Simpson, J. Chem. Soc., Perkin Trans. 1, 1977, 592 DOI: 10.1039/P19770000592
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