DL-[2-14C]Tryptophan fed to Calycanthus floridus plants yields radioactive folicanthine. Unambiguous degradation of the alkaloid shows tryptophan to be a direct precursor. Seasonal variation of the alkaloid is reported.
D. G. O'Donovan and M. F. Keogh, J. Chem. Soc. C, 1966, 1570 DOI: 10.1039/J39660001570
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