Synonyms: 2-Butenoicacid, 2-methyl-,1,4,5,6,7,7a,8,10a-octahydro-11-hydroxy-1,7a-dimethyl-5-methylene-4,8-dioxo-2,6-methano-2H-cyclopent[d]oxonin-7-ylester, [1S-[1a,2b(R*),6b,7a(E),7ab,10aa]]-; Ambrosa-2,11(13)-dien-12-oic acid, 6a,8b,9b-trihydroxy-4-oxo-, d-lactone, 6-(2-methylcrotonate), (E)- (8CI); Linearifolin B