Antitumor agents. XV: Deoxyelephantopin, an antitumor principle from Elephantopus carolinianus Willd

The active principle responsible for the significant inhibitory activity against the Walker 256 carcinosarcoma (ascites) in rats, isolated from the chloroform extract of the whole plant of Elephantopus carolinianus Willd., was characterized as deoxyelephantopin, a sesquiterpene lactone.