CH₃-CH₂-CH(NH₂)-COOH
[-NH-CH(C₂H₅)-COO-]₃
3CH₃-CH₂-CH(NH₂)-COOH → NH₂-CH(C₂H₅)-COO-NH-CH(C₂H₅)-COO-NH-CH(C₂H₅)-COOH + 2H₂O
CH₃-CH₂-CH(NH₂)-COOH
[-NH-CH(C₂H₅)-COO-]₃
3CH₃-CH₂-CH(NH₂)-COOH → NH₂-CH(C₂H₅)-COO-NH-CH(C₂H₅)-COO-NH-CH(C₂H₅)-COOH + 2H₂O