parthenin

(3aS)-3,3a,4,5,6,6a,9a,9bβ-Octahydro-6aβ-hydroxy-6α,9aα-dimethyl-3-methyleneazuleno[4,5-b]furan-2,9-dione

(3aS)-3-Methylene-6α,9aα-dimethyl-6aβ-hydroxy-2,3,3aβ,4,5,6,6a,9,9a,9bβ-decahydroazuleno[4,5-b]furan-2,9-dione