New amino acids, 3-(6-carboxy-2-oxo-3-pyridyl)-L-alanine, 3-(6-carboxy-2-oxo-4-pyridyl)-L-alanine and N-[2-(3-pyridyl)ethyl]-L-glutamic acid were isolated from the poisonous mushroom Clitocybe acromelalga and their structures were determined. Their occurrence in this fungus supports the previously proposed biogenesis of acromelic acids. © 1993.
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