5,5a-dihydroxy-4a-(hydroxymethyl)-7,9-dimethyl-10a-(1-methylethenyl)-2-[(1E,3E)-nona-1,3-dien-1-yl]-3a,3b,3c,4a,5,5a,8a,9,10,10a-decahydro-6H-2,8b-epoxyoxireno[6,7]azuleno[5,4-e][1,3]benzodioxol-6-one