The structure of bipolaramide, a new dioxopiperazine isolated from cultures of Bipolaris sorokiniana, is based on 1H and 13C n.m.r. data and X-ray crystallography. Incorporation studies with 14C-labelled precursors established that bipolaramide is formed from phenylalanine via cyclo-(L-phenylalanyl-L-phenylalanyl).
C. M. Maes, P. S. Steyn, R. Vleggaar, G. W. Kirby, D. J. Robins and W. M. Stark, J. Chem. Soc., Perkin Trans. 1, 1985, 2489 DOI: 10.1039/P19850002489
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