The yellow pigments of Beauveria species. Structures of tenellin and bassianin

Abstract
Tenellin and bassianin [B. bassiana and B. tenella] are deduced from chemical and spectroscopic evidence to be the 3-[E,E)-4,6-dimethylocta-2,4-dienoyl] and 3-[(E,E,E)-6,8-dimethyldeca-2,4,6-trienoyl] derivatives of 1,4-dihydroxy- 5-(p-hydroxyphenyl)-2(1H)-pyridone. Spin-spin coupling information in the 1H and 13C NMR spectra after biosynthetic enrichment of tenellin with 13C and 15N isotopes was a valuable aid in elucidating the structure.

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