p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-(4-p-nitrobenzyloxycarbonylaminobutyrylthio)-2-oxoazetidin-1-yl>-2-triphenylphosphoranylideneacetate

4-乙酰氧基氮杂环丁酮

4-p-nitrobenzyloxycarbonylaminothiobutyric acid

(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-<4-(p-nitrobenzyloxycarbonylamino)butyrylthio>azetidin-2-one

p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-(4-p-nitrobenzyloxycarbonylaminobutyrylthio)-2-oxoazetidin-1-yl>-2-hydroxyacetate