pentalenene

(1S,8aS)-1β,4,7,7-Tetramethyl-1,2,3,3aβ,5aα,6,7,8-octahydrocyclopenta[c]pentalene

(1S,8aS)-1,2,3,3aβ,5aα,6,7,8-Octahydro-1β,4,7,7-tetramethylcyclopenta[c]pentalene

(1alpha,3Aalpha,5abeta,8ar*)-1,2,3,3A,5A,6,7,8-octahydro-1,4,7,7-tetramethylcyclopenta(C)pentalene