2-Butenoic acid, 2-methyl-, 2,3,3a,4,5,6,7,8,11,11a-decahydro-4-hydroxy-6,10-dimethyl-3-methylene-2,8-dioxocyclodeca(b)furan-5-yl ester, (3aR-(3aR*,4R*,5R*(Z),6R*,9Z,11aR*))- 81344-93-6 Vicolide B