Synonyms: 2-Butenoicacid, 2-methyl-,2,3,3a,4,4a,5,7a,8,9,9a-decahydro-3,4a,8-trimethyl-2,5-dioxoazuleno[6,5-b]furan-4-ylester, [3S-[3a,3ab,4b(Z),4aa,7ab,8b,9ab]]-; Ambros-2-en-12-oic acid, 6a,8b-dihydroxy-4-oxo-, 12,8-lactone, 2-methylcrotonate, (Z)- (8CI);Azuleno[6,5-b]furan, 2-butenoic acid deriv.; 6-O-Angeloylprenolin; Brevelin A;Brevilin A