(4aR,10aR,10bS)-2,3,7,8,10a,10b-Hexahydro-7,7,10a-trimethyl-1H-naphtho<2,1-b>pyran-5(4aH)-one

2,7,7-trimethylbicyclo<2.2.2>oct-2-en-5-one

(+)-Epiambroxide

(4aS,5R,6aS,10aS,10bS)-Dodecahydro-4a,7,7,10a-tetramethyl-1H-naphtho<2,1-b>pyran-5-ol

(4aS,5R,10aR,10bS)-2,3,4a,5,7,8,10a,10b-Octahydro-4a,7,7,10a-tetramethyl-1H-naphto<2,1-b>pyran-5-ol