Abstract
The two isomeric 1-hydroxymethylpyrrolizidines, trachelanthamidine and isoretronecanol labelled with 14C and 3H, respectively, were synthesized and fed to Senecio riddellii plants, resulting in the formation of riddelliine specifically labelled in its retronecine moiety, tracheianthanamidine being the more efficient precursor (15.1% absolute incorporation).

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