Synonyms: 2-Butenoicacid, 2-methyl-,2,2a,4,5,6,6a,7,8,9a,9b-decahydro-1-hydroxy-1,7-dimethyl-4,8-dioxo-1H-azuleno[1,8-bc:4,5-b']difuran-6-ylester, [1R-[1a,2aa,6b(E),6aa,7b,9ab,9ba]]-; 1H-Azuleno[1,8-bc:4,5-b']difuran, 2-butenoic acid deriv.; Eufoliatorin