1-(1-methyl-2-methylidenecyclopentyl)ethanone

trimethyl((3-methyloct-2-en-7-yn-2-yl)oxy)silane

ethyl 1,2-dimethylcyclopent-2-ene-1-carboxylate

ethyl 1-methyl-2-oxocyclopentane-1-carboxylate