Putrescine, spermidine, and spermine are efficient precursors of retronecine in Senecio isatideus plants; degradations of labelled alkaloids indicate that a symmetrical intermediate of the type C4–N–C4 is involved in the biosynthesis.
D. J. Robins and J. R. Sweeney, J. Chem. Soc., Chem. Commun., 1979, 120 DOI: 10.1039/C39790000120
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