4,4-Dimethyl-1-oxiranyl-pentan-3-one

2,2-dimethyl-4,6-heptadien-3-one

(E)-2,2-Dimethyl-5-hepten-2-one

3a,6-Di-tert-butyl-1a,2,3,3a,3b,4,5,7-octahydro-1H-cyclopenta[a]cyclopropa[d]pentalene