乙基4-(4-甲氧基苯基)-3-氧代丁酸酯

反式-2-庚酸乙酯

ethyl (Z)-hept-2-enoate

2-Propenoic acid, 3,3'-(1,3-phenylene)bis-, diethyl ester (en)

ethyl 4-acetyloxy-3-oxobutanoate