The caged amino acid in accordance with the present invention has the structure represented by the following formula 1: 
where X and Y each represent a halogen atom, an alkyl group, an alkyloxy group, an alkylamino group, or a benzo group; R1 represents a hydrogen atom or an alkyl group; R2 and R3 each represent a hydrogen atom or an alkyl group; A represents an amino acid residue; and M represents a hydrogen atom, an alkali metal, or an alkaline-earth metal.
                            根据本发明,笼状
氨基酸的结构由以下公式1表示:其中X和Y分别代表卤素原子、烷基、烷氧基、烷基
氨基或苯基;R1代表氢原子或烷基;R2和R3分别代表氢原子或烷基;A代表
氨基酸残基;M代表氢原子、碱
金属或碱土
金属。