(2S,4S)-4 -氨基- 1 -(叔丁氧羰基)吡咯烷二羧酸

3(R)-[(4(S)-((4-azido-2-hydroxy-5-iodobenzoyl)amino)-1-(tert-butoxycarbonyl)-2(S)-pyrrolidinylcarbonyl)amino]-2-oxo-1-pyrrolidineacetamide

3(R)-[(4(S)-(4-benzyloxycarbonylamino)-1-(tert-butoxycarbonyl)-2(S)-pyrrolidinylcarbonyl)amino]-2-oxo-1-pyrrolidineacetamide

methyl 3(R)-[(4(S)-(4-benzyloxycarbonylamino)-1-(tert-butoxycarbonyl)-2(S)-pyrrolidinylcarbonyl)amino]-2-oxo-1-pyrrolidineacetate

3(R)-[(4(S)-((4-azido-2-hydroxybenzoyl)amino)-1-(tert-butoxycarbonyl)-2(S)-pyrrolidinylcarbonyl)amino]-2-oxo-1-pyrrolidineacetamide