ethyl 5-methyl-2-methylidene-3H-furan-4-carboxylate

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

2,3-二乙酰基丁二酸二乙酯

ethyl 2-acetyl-2-pentenoate

4-Pentynoic acid, 2-acetyl-, ethyl ester