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The acid salts of amino acid β-naphthylamides have been found to have greater stability and solubility than their corresponding free bases. For the purpose of applying these substrates in subsequent studies in histochemical and biochemical systems, the syntheses and characteristics of a large variety of previously unreported intermediates, acid salts and free bases of amino acid β-naphthylamides and their analogues are described.

THE ENZYMATIC HYDROLYSIS OF AMINO ACID β-NAPHTHYLAMIDES: I. PREPARATION OF AMINO ACID AND DIPEPTIDE β-NAPHTHYLAMIDES