Ethyl N-(1-((benzyloxy)carbonyl)-L-prolyl)-L-leucinate

Ethyl N-(1-(4-fluorophenyl)ethyl)-N-formyl-3-oxoalaninate

Ethyl N-(1-isopropyl-2-methylcycloheptanecarbonyl)glycinate

Ethyl N-(1-isopropylcyclopentanecarbonyl)glycinate

Ethyl N-(2, 3-dimethyl-2-isopropyl-1-oxobutyl)glycinate

Ethyl N-(2, 4, 5-trichlorophenyl)carbamate

Ethyl N-(2, 4-dinitrophenoxy)thioacetate

Ethyl N-(2, 5-dimethoxybenzyloxycarbonyl)-p-aminobenzoate

Ethyl N-(2-(4-((2-hydroxycyclohexyl)methyl)phenoxy)ethyl)carbamate

Ethyl N-(2-cyclohexyl-1-(ethoxycarbonyl-(ethoxycarbonylamino)amino)-2-morpholin-4-ylethenyl)-N-(ethoxycarbonylamino)carbamate

Ethyl N-(2-ethoxy-2-oxoethyl)-N-(phenylmethyl)-beta-alaninate

Ethyl N-(2-ethoxy-2-oxoethyl)-N-methylglycinate

Ethyl N-(2-isobutyl-4-methyl-1-oxopentyl)glycinate

Ethyl N-(2-isopropylcycloheptanecarbonyl)glycinate

Ethyl N-(2-sec-butyl-3-methyl-1-oxopentyl)glycinate

Ethyl N-(3-(bis(2-chloroethyl)amino)-3-phenyl-N-L-prolyl-L-alanyl)-4-fluoro-3-phenyl-L-alaninate monohydrochloride

Ethyl N-(3-(bis(2-chloroethyl)amino)-N-(N-(4-fluoro-3-phenyl-L-alanyl)glycyl)-3-phenyl-L-alanyl)-L-norvalinate

Ethyl N-(3-chloro-4-((2-cyano-4-nitrophenyl)azo)phenyl)-N-ethyl-beta-alaninate

Ethyl N-(3-ethoxy-3-oxopropyl)-N-(2-phenylethyl)-beta-alaninate

Ethyl N-(3-ethoxy-3-oxopropyl)-N-(phenylmethyl)-beta-alaninate