2-Propenoic acid, 2-methyl-, 5-(acetyloxy)-2,3,3a,4,5,6,7,10,11,11a-decahydro-6,10-dimethyl-3-methylene-2,7-dioxo-6,9-epoxycyclodeca(b)furan-4-yl ester, (3aS-(3aR*,4R*,5S*,6S*,10S*,11aS*))- 82513-43-7