Showing structure for [3aR-(3aalpha,4alpha,5abeta,9alpha,9aalpha,9bbeta)]-4-(Acetyloxy)-3a,5,5a,9,9a,9b-Hexahydro-9-hydroxy-5a,9-dimethyl-3-methylenenaphtho[1,2-b]furan-2,6(3H,4H)-dione