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p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-<((2R)-N-p-nitrobenzyloxycarbonylpyrrolidin-2-yl)acetylthio>-2-oxoazetidin-1-yl>-2-triphenylphosphoranylideneacetate
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(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-<5-(p-nitrobenzyloxycarbonylamino)pentanoylthio>azetidin-2-one
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(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-<(2R)-N-p-nitrobenzyloxycarbonylpyrrolidin-2-yl>carbonylthioazetidin-2-one