(3aR,3bR,4R,6aS,7S)-7-Hydroxy-3,3a,5,5-tetramethyl-4-(tetrahydro-pyran-2-yloxy)-3,3a,3b,4,5,6,6a,7-octahydro-cyclopenta[a]pentalen-2-one

(3aR,3bS,4S,6aR,7R)-7-Hydroxy-3,3a,5,5-tetramethyl-3-phenylselanyl-4-(tetrahydro-pyran-2-yloxy)-3,3a,3b,4,5,6,6a,7-octahydro-cyclopenta[a]pentalen-2-one