(+/-)-hirsutic acid C

methyl [2S-(2α,3aα,3bβ,7aα)]-2,3,3a,3b,4,5,7,7a-octahydro-2,3b-dimethyl-4-methylene-5-oxo-1H-cyclopenta[a]pentalene-2-carboxylate

(2R,3aS,3bS,7aS)-6a-Hydroxy-2,3b-dimethyl-4-methylene-5-oxo-decahydro-cyclopenta[a]pentalene-2-carboxylic acid methyl ester