12a-hydroxy-2,2,7,7,9,11-hexamethyl-13-oxo-6,7,7a,8,9,12,12a,12b-octahydro-4H,6aH-6,9a-methanocyclopenta[9,10]cyclopropa[5,6]cyclodeca[1,2-d][1,3]dioxin-12-yl (2E,4E,6E)-deca-2,4,6-trienoate