Showing structure for [3R-[3alpha,3abeta,5aalpha,6beta(Z),6abeta,7abeta,8abeta,8balpha]]-Dodecahydro-3,5a-dimethyl-8-methylene-2-oxooxireno[6,7]naphtho[1,2-b]furan-6-yl ester 2-methyl-2-butenoic acid