2-Butenoic acid, 4-(acetyloxy)-2-(hydroxymethyl)-, 9-(acetyloxy)-2,3,3a,4,5,8,9,11a-octahydro-6,10-dimethyl-3-methylene-2-oxocyclodeca(b)furan-4-yl ester, (3aR-(3aR*,4R*(E),6E,9S*,10Z,11aR*))- 69375-35-5