Synonyms: (1S,4E,8E,10S)-4,8-dimethyl-13-methylidene-11-oxabicyclo[8.3.0]trideca-4,8-dien-12-one;Cyclodeca[b]furan-2(3H)-one,3a,4,5,8,9,11ahexahydro- 6,10-dimethyl-3-methylene-,(3aS,6E,10E,11aR)-;Costunolid;(1S,10S)-4,8-dimethyl-13-methylidene-11-oxabicyclo[8.3.0]trideca-4,8-dien-12-one;Costus lactone;(E,E)-6-alpha-Hydroxygermacra-1(10),4,11(13)-trien-12-oic acid gamma-lactone;