Helenin

Helenin is a phytochemical mixture found in many plant species, including the Inula helenium (elecampane) of the Asteraceae family. It is a mixture of two isomeric sesquiterpene lactones, alantolactone and isoalantolactone.

In 1895 a German scientists Julius Bredt and Wilhelm Posh extracted helenin from Inula helenium and determined its physical and chemical properties.