4-哌啶乙酸乙酯

ethyl trans-3-methyl-2-pentenoate

ethyl 3-methylpent-2-enoate

ethyl 4-methylpenta-2,4-dienoate

3-(2,2,5,5-四甲基吡咯啉基-1-氧基)丙烯-2-酸乙酯