alantolactone

Noun

 * 1)  The sesquiterpene lactone 3aR,5S,8aR,9aR-3a,5,6,7,8,8a,9,9a-octahydro-5,8a-dimethyl-3-methylene-naphtho[2,3-b]furan-2(3H)-one which inhibits proliferation of cancer cells