乙酰乙酸甲酯

3-溴丙炔

5-iodomethyl-3-methoxycarbonyl-2-methyl-4,5-dihydrofuran

methyl 2-acetylpent-4-ynoate

甲基2-甲基-5-亚甲基-4,5-二氢-3-呋喃羧酸酯