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

(1R)-1α,4-Dimethyl-6α,6aα-(2,2-dimethyltrimethylene)-1,2,3,3aα,6,6a-hexahydropentalene