Synonyms: 4bH-Guaian-12-oic acid, 6a,10-dihydroxy-3-oxo-, g-lactone, (11S)- (8CI);Azuleno[4,5-b]furan-2,8(3H,4H)-dione, octahydro-6-hydroxy-3,6,9-trimethyl-,[3S-(3a,3aa,6a,6aa,9a,9aa,9bb)]-; Isophotosantonic lactone,dihydro- (7CI); 4-epi-Dihydroisophoto-a-santonic lactone; Dihydroisophotosantonic lactone;Dihydroisophotosantonin; Isophotosantonin, dihydro-