(1S,2S,7S,10R,11S,15S)-2,15-dimethyltetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadecane-5,14-dione
(1S,2S,7S,10R,11S,15S)-2,15-dimethyltetracyclo[8.7.0.02,7.011,15]heptadecane-5,14-dione
(3aS,3bR,5aS,9aS,9bS,11aS)-9a,11a-dimethyl-hexadecahydro-1H-cyclopenta[a]phenanthrene-1,7-dione