(2S)-2-(2-benzyloxycarbonylamino-3-hydroxypropyl)malonic acid di-tert-butyl ester

2S-(3-benzyloxycarbonyl-2,2-dimethyloxazolidin-4-ylmethylene)-malonic acid di-tert-butyl ester

(R)-4-甲酰基-2,2-二甲基噁唑啉-3-羧酸苄酯

(4S)-2-(3-benzyloxycarbonyl-2,2-dimethyloxazolidin-4-ylmethyl)malonic acid di-tert-butyl ester

丙二酸二叔丁酯