Tenellin and bassianin, metabolites of Beauveria species. Structure elucidation with 15N- and doubly 13C-enriched compounds using 13C nuclear magnetic resonance spectroscopy

Abstract
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.