13 C n.m.r. spectroscopy and biosynthetic labelling with [15N]nitrate and [1,2-13C]acetate proved to be valuable adjuncts to established chemical and spectroscopic methods in elucidating the structures of tenellin and bassianin as 3-acyl derivatives of 1,4-dihydroxy-5-p-hydroxyphenyl-2(1H)-pyridone.
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McInnes et al. (1974) studied this question.