(5S,6S)-6-((R)-1-Hydroxy-ethyl)-3-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester

(5S,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester

{(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-hydroxy-acetic acid 4-nitro-benzyl ester

3-<<(p-nitrobenzyl)oxycarbonyl>amino>propanethiol

4-乙酰氧基氮杂环丁酮

{(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-(triphenyl-λ5-phosphanylidene)-acetic acid 4-nitro-benzyl ester

Trithiocarbonic acid (2R,3S)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl ester 3-(4-nitro-benzyloxycarbonylamino)-propyl ester