(3aS,3bR,4R,6aS)-4-benzyloxy-3,3a,3b,4,5,6,6a,7-octahydro-3a,5,5-trimethylcyclopentapentalen-2-one

(3R,3aR,3bS,7aR)-2,2,3b-Trimethyl-5-triisopropylsilanyloxy-3-trimethylsilanyloxy-2,3,3a,3b,4,7a-hexahydro-1H-cyclopenta[a]pentalene

(3aR,3bS,4S,6aS)-(-)-3,3a,3b,4,5,6,6a,7-octahydro-4-hydroxy-3a,5,5-trimethylcyclopenta<4.5>pentalen-2-one

rac-(4aR,4bS,5S,7aR)-5-((tert-butyldimethylsilyl)oxy)-4a,6,6-trimethyloctahydrocyclopenta[2,3]pentaleno[1,2-b]oxiren-3(2H)-one