Synonyms: Azuleno(4,5-b)furan-2,9-dione, 3,3a,4,5,6,6a,9a,9b-octahydro-6a-hydroxy-6,9a-dimethyl-3-methylene-, (3aS,6S,6aR,9aS,9bR)-;azuleno[4,5-b]furan-2,9-dione, 3,3a,4,5,6,6a,9a,9b-octahydro-6a-hydroxy-6,9a-dimethyl-3-methylene-, (3aS,6S,6aR,9aS,9bR)-