(3aR)-3a,4,5,6-tetrahydro-3H-pyrrolo[1,2-c]oxathiazole 1,1-dioxide

(R)-2-(叠氮甲基)-1-叔丁氧羰基-吡咯烷

N-Cbz-D-脯氨醇

BOC-D-脯氨醛

(R)-2-(氰基甲基)吡咯烷-1-甲酸叔丁酯