Abstract
Two new alkaloids, echiumine, C20H31O6N,
and echimidine, C20H31O7N, have been isolated
from Echium plantagineum L. Both have a retronecine nucleus esterified on the
7-hydroxyl group with angelic acid. The main esterifying acid of echiumine is
trachelanthic acid and of echimidine is 2-methyl-2,3,4-trihydroxypentane-3-carboxylic
acid, identical with the esterifying acid of heliosupine. The structure of
heliosupine, a diastereoisomer of echimidine, has been confirmed.
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