Elephantopin

Elephantopin is a natural chemical compound extracted from the Elephantopus elatus plant of the genus Elephantopus, family Compositae. It is a sesquiterpene lactone with a germacranolide skeleton, containing two lactone rings and an epoxide functional group. It has been shown to have an antitumor activity. ...
Found on http://en.wikipedia.org/wiki/Elephantopin
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