(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

(1aS,1bS,3aR,6bS,8aS)-3a-Methyl-8-oxo-1a,2,3,3a,4,5,6b,7,8,8a-decahydro-1-oxa-cyclopenta[a]cyclopropa[f]naphthalene-1b-carboxylic acid methyl ester

(3aR,5aS,6R,9aS)-6-Hydroxy-3a-methyl-8-oxo-2,3,3a,4,5,6,7,8,9,9a-decahydro-cyclopenta[a]naphthalene-5a-carboxylic acid methyl ester