Ethyl 4-(benzoylamino)benzoate

Ethyl 4-(benzyl(2-ethoxy-2-oxoethyl)amino)butyrate

Ethyl 4-(bis(hydroxypropyl)amino)benzoate

Ethyl 4-(butyl(4-((4, 5-dicyano-1-(cyanomethyl)-1H-imidazol-2-yl)azo)-m-tolyl)amino)butyrate

Ethyl 4-(dichlorophenylmethyl)benzoate

Ethyl 4-(diethoxymethylsilyl)butyrate

Ethyl 4-(diethoxyphosphoryl)-2-butenoate

Ethyl 4-(dimethylamino)butyrate

Ethyl 4-(ethoxycarbonyl)piperidine-1-acetate

Ethyl 4-(hydroxyimino)piperidine-1-carboxylate

Ethyl 4-(hydroxymethyl)-2, 6-dimethoxyphenyl carbonate

Ethyl 4-(methylthio)benzoate

Ethyl 4-(methylthio)butyrate

Ethyl 4-(phenylmethoxy)-1H-indole-2-carboxylate

Ethyl 4-(triphenylphosphoranyl)butanoate

Ethyl 4-acetamido-3-hydroxybenzoate

Ethyl 4-acetylphenylacetate

Ethyl 4-acetylphenylsulphonylcarbamate

Ethyl 4-amidinophenylpyruvate

Ethyl 4-amino-1-piperidinecarboxylate