(1S,2R,10R,11S,15S)-2,15-dimethyltetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadec-6-ene-5,14-dione
(1S,2R,10R,11S,15S)-2,15-dimethyltetracyclo[8.7.0.02,7.011,15]heptadec-6-ene-5,14-dione
(3aS,3bR,9aR,9bS,11aS)-9a,11a-dimethyl-1H,2H,3H,3aH,3bH,4H,5H,7H,8H,9H,9aH,9bH,10H,11H,11aH-cyclopenta[a]phenanthrene-1,7-dione