ethyl 3-oxo-2-[2-(tetrahydro-2H-pyran-2-yloxy)ethyl]hept-6-enoate

1-(tetrahydropyran-2-yloxy)oct-7-en-4-one

γ-丁内酯

3-丁烯基溴化镁

3-氧代-6-庚烯酸乙基