Synonyms: 2-Butenoicacid, 2-methyl-,2,3,3a,4,5,7,7a,8a,8b,8c-decahydro-4-hydroxy-6,8a-dimethyl-3-methylene-2-oxooxireno[2,3]azuleno[4,5-b]furan-5-ylester, [3aR-[3aa,4a,5b(Z),7aa,8aa,8ba,8cb]]-; Oxireno[2,3]azuleno[4,5-b]furan, 2-butenoic acid deriv.;Bacchariolide B