(1r,3s,5z)-5-[(2e)-2-[(1r,3as,7ar)-1-[(e,2r,5s)-5-hydroxy-5,6-dimethylhept-3-en-2-yl]-7a-methyl-2,3,3a,5,6,7-hexahydro-1h-inden-4-ylidene]ethylidene]-4-methylidenecyclohexane-1,3-diol