ethyl 4-(2-phenylethylamino)butanoate

ethyl 4-(2-methylsulfonyloxyethylsulfanyl)butanoate

ethyl 4-(3,4-dichlorophenoxy)butanoate

4-溴-1,1-双(3-甲基噻吩-2-基)-1-丁醇

ethyl 4-(4-formylphenoxy)butanoate