4-NITROBENZYL (R)-4-((2R,3S)-3-((R)-1-((TERT-BUTYLDIMETHYLSILYL)OXY)ETHYL)-4-OXOAZETIDIN-2-YL)-2-DIAZO-3-OXOPENTANOATE
4-nitrobenzyl (r)-4-((2r,3s)-3-((r)-1-((tert-butyldimethylsilyl)oxy)ethyl)-4-oxoazetidin-2-yl)-2-diazo-3-oxopentanoate