Synonyms: 2H-Pyran-2-one,tetrahydro-4-hydroxy-3,3,5-trimethyl-6-(1-methyl-1-propenyl)-, [4a,5a,6b(E)]-(-)-; 2H-Pyran-2-one,tetrahydro-4-hydroxy-3,3,5-trimethyl-6-[(1E)-1-methyl-1-propenyl]-,(4R,5S,6S)-rel-(-)- (9CI); (-)-Helicascolide A; Helicascolide A