常用作制备 N-端保护氨基酸的 4-硝基苯基活性酯、对称和不对称脲，合成氨基酸的 4-硝基苯基活性酯的试剂。 应用： 制备 N-端保护氨基酸的 4-硝基苯基活性酯的试剂。 合成氨基酸的 4-硝基苯基活性酯的试剂。用于制备对称和不对称脲。 Usually used as reagent for the preparation of activated 4-nitrophenyl esters of N-protected amino acids, the synthesis of 4-nitrophenyl active esters of amino acids.And also used in the preparation of symmetrical and unsymmetrical ureas. Application： Reagent for the preparation of activated 4-nitrophenyl esters of N-protected amino acids. Reagent for the synthesis of 4-nitrophenyl active esters of amino acids. Used in the preparation of symmetrical and unsymmetrical ureas.