2-Amino-3-hydroxy-succinic acid 1-ethyl ester 4-methyl ester   、                                                                                      
甲酸乙酯                                                                                                                                                                                                                                                                      反应 5.5h,
                                                                                                                生成                                                 (2S,3S)-2-Formylamino-3-hydroxy-succinic acid 1-ethyl ester 4-methyl ester   、                                                                                             (2R,3R)-2-Formylamino-3-hydroxy-succinic acid 1-ethyl ester 4-methyl ester   、                                                                                             
(2S,3R)-2-Formylamino-3-hydroxy-succinic acid 1-ethyl ester 4-methyl ester