2-Butenoic acid, 2-methyl-, 9-(acetyloxy)-2,3,3a,4,7,8,9,11a-octahydro-7-hydroxy-6,10-dimethyl-3-methylene-2-oxocyclodeca(b)furan-4-yl ester, (3aR-(3aR*,4R*(Z),5Z,7S*,9S*,10Z,11aR*))- 33854-15-8 Eupacunin NSC 135020