1,1-dimethyl-3-methylidenecyclopentane

4-(4,4-dimethyl-2-oxocyclopentyl)-2(5H)-furanone

3-(2,2-dimethyl-5-oxocyclopentyl)-2H-furan-5-one

4,4-dimethyl-2-oxocyclopentane-1-carbaldehyde

2-(1,3-dioxolan-2-yl)-4,4-dimethylcyclopentan-1-one