Synonyms: 2-Butenoicacid, 3-methyl-,2,3,3a,4,5,8,9,11a-octahydro-5,8-dihydroxy-6,10-dimethyl-3-methylene-2-oxocyclodeca[b]furan-4-ylester, [3aS-(3aR*,4S*,5S*,6E,8S*,10E,11aS*)]-; Cyclodeca[b]furan, 2-butenoicacid deriv.; (+)-Montafrusin B; Montafrusin B