Synonyms: (3S,3aS,9aS,9bS)-3,6,9-Trimethyl-3,3a,4,5,9a,9b-hexahydroazuleno[4,5-b]furan-2,7-dione;Azuleno(4,5-b)furan-2,7-dione, 3,3a,4,5,9a,9b-hexahydro-3,6,9-trimethyl-, (3S,3aS,9aS,9bS)-;azuleno[4,5-b]furan-2,7-dione, 3,3a,4,5,9a,9b-hexahydro-3,6,9-trimethyl-, (3aS,9aS,9bS)-