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(3S,4R)-3-<(1R)-1-hydroxyethyl>-4-<(1R)-1-methyl-3-p-nitrobenzyloxycarbonyl-2-oxopropyl>-2-azetidin-2-one
magnesium 4-nitrobenzyl malonate
(2R)-2-[(2S,3S)-3-{(1R)-1-(t-butyldimethylsilyloxy)ethyl}-4-oxoazetidin-2-yl]propionic acid
(3S,4R)-3-<(1R)-1-<(tert-Butyldimethylsilyl)oxy>ethyl>-4-<(1R)-1-methyl-3-(p-nitrobenzyloxycarbonyl)-2-oxopropyl>azetidin-2-one
nitromethane
(4S,5R,6S)-6-((R)-1-Hydroxy-ethyl)-4-methyl-3,7-dioxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester
(4-nitrophenyl)methyl (4R,5S,6S)-3-[[(3S,5S)-5-[[(-carboxyphenyl)amino]carbonyl]-1-[[(4-nitrophenyl)methyoxy]carbonyl]-3-pyrrolidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate
ertapenem
(4R,5S,6S)-3-[[(3S,5S)-5-[[(aminosulfonyl)amino]methyl]-1-[[(4-nitrophenyl)methoxy]carbonyl]-3-pyrrolidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (4-nitrophenyl)methyl ester
p-nitrobenzyl (4R,5S,6S)-3-<(3S,5S)-5-dimethylaminocarbonyl-1-(p-nitrobenzyloxycarbonyl)pyrrolidin-3-ylthio>-6-<(1R)-1-hydroxyethyl>-4-methyl-7-oxo-1-azabicyclo<3.2.0>hept-2-en-2-carboxylate