D. G. O'Donovan and M. F. Keogh
J. Chem. Soc. C, 1966, 1570-1572
DOI:
10.1039/J39660001570,
Paper
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.