Synonyms: 2-Butenoicacid, 3-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,7ab,8ab,8ba,8cb)]-; Oxireno[2,3]azuleno[4,5-b]furan, 2-butenoic acid deriv.; Tomencephalin