| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyasparagine derivative without forming anhydropolyaspartic acid as an intermediate. SOLUTION: This polyasparagine derivative is obtained by heating an N- substituted maleamic acid ammonium salt and/or N,N-disubstituted maleamic acid ammonium salt, or by mixing aspartic acid with a primary amine- or a secondary amine-derived ammonium salt followed by heating the mixture.
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