(S)-2,6-Bis((tert-butoxycarbonyl)amino)hexanoic acid is a polypeptide derivative, can be used to synthesis multifunctional amphiphilic peptide dendrimer, as a nonviral gene vectors, realizes the method in cancer research. (S)-2,6-Bis((tert-butoxycarbonyl)amino)hexanoic acid also involves in the synthesis of an organic substance that increases the luminescence intensity of alkaline phosphatase substrates.