(3aR,5aR,9aS)-3a-Methyl-8-oxo-2,3,3a,4,5,8,9,9a-octahydro-cyclopenta[a]naphthalene-5a-carboxylic acid methyl ester

(3aR,5aR,8R,9aS)-8-Acetoxy-3a-methyl-2,3,3a,4,5,8,9,9a-octahydro-cyclopenta[a]naphthalene-5a-carboxylic acid methyl ester