Oxireno[1,2]azuleno[4,5-b]furan-2(3H)-one, decahydro-6,8-dihydroxy-6,8-dimethyl-3-methylene-, (3aS,6R,6aS,6bR,7aR,8S,8aS,8bS)-

artenolide

6-Oxo-2.8-dimethyl-bicyclo[5.3.0]decan

1,4-Dimethyl-7-ethyl-bicyclo(5.3.0)decan-8-on

1.4-Dimethyl-7-aethyl-carbomethoxy-bicyclo-[5:3:0]-decanon-(8)