It was used in the synthesis of pH-sensitive polyaspartamide derivatives. It was also used in the preparation of pH-sensitive amphiphilic polymers with different degrees of octaceylamine (C18) substitution by graft reaction. It was used in the synthesis of pH-sensitive polyaspartamide derivatives. It was also used in the preparation of pH-sensitive amphiphilic polymers with different degrees of octaceylamine (C18) substitution by graft reaction.