Synonyms: 5-Azuleneaceticacid, 1,2,4,5,6,7,8,8aa-octahydro-4,8a-dihydroxy-a,3,8-trimethyl-2-oxo-,g-lactone (7CI);Azuleno[4,5-b]furan-2,8(3H,4H)-dione,3a,5,6,6a,7,9b-hexahydro-6-hydroxy-3,6,9-trimethyl-, [3S-(3a,3aa,6a,6aa,9bb)]-; Guai-4-en-12-oic acid, 6a,10-dihydroxy-3-oxo-, g-lactone, (11S)- (8CI);Isophotosantonic lactone (6CI); (11S)-10a-Hydroxy-3-oxoguaia-4-eno-12,6a-lactone; Isophotosantonin;Isosantoxane