methyl 4-chlorooctanoate

4-(甲基氨基)-4-氧代丁酸甲酯

4-chloro-1-(1H-pyrrol-3-yl)butan-1-one

3-(1,3-二氧戊环-2-基)丙酸甲酯

methyl 4-oxo-5-(triphenyl-λ⁵-phosphanylidene)pentanoate