Synonyms: 2H-Pyran-2-one,3-[2-[(2R,4aS,5R,8aS)-decahydro-2,4a-dimethyl-5-(4-methyl-3-pentenyl)-6-oxo-2-naphthalenyl]ethyl]-4-hydroxy-5,6-dimethyl-(9CI); 2H-Pyran-2-one,3-[2-[decahydro-2,4a-dimethyl-5-(4-methyl-3-pentenyl)-6-oxo-2-naphthalenyl]ethyl]-4-hydroxy-5,6-dimethyl-,[2R-(2a,4aa,5a,8ab)]-; Pycnophorin