A new metabolite has been isolated from Aspergillus chevalieri as colorless needles, mp 294_??_296°C, [α]D+46°. It has a dioxopiperazine ring system formed from tryptophan and alanine. Chemical and spectroscopic data indicate that this metabolite is L-alanyl-2-(1, 1-dimethylallyl)-L-tryptophan anhydride (I).
