(4R,5S,6S)-6-((R)-1-Hydroxy-ethyl)-4-methyl-3-{(3S,5S)-1-(4-nitro-benzyloxycarbonyl)-5-[2-(4-nitro-benzyloxycarbonylamino)-ethylsulfanylmethyl]-pyrrolidin-3-ylsulfanyl}-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester

4-nitrobenzyl (1R,5S,6S)-6-[(R)-1-hydroxyethyl]-1-methyl-2-[(S)-2(S)-methyl-5-oxopyrrolidin-3-ylthio]-1-carbapen-2-em-3-carboxylate

p-nitrobenzyl (1R,5S,6S)-6-[(1R)-1-hydroxyethyl]-2-[(6R,8S)-2,2-dimethyl-4-oxo-1,3-diazabicyclo[4.3.0]nonan-8-ylthio]-1-methylcarbapen-2-em-3-carboxylate

p-nitrobenzyl (1R,5S,6S)-6-[(1R)-1-hydroxyethyl]-2-[(6R,8S)-2,2-diethyl-4-oxo-1,3-diazabicyclo[4.3.0]nonan-8-ylthio]-1-methylcarbapen-2-em-3-carboxylate

(4R,5S,6S)-3-((3S,4S)-4-Aminomethyl-tetrahydro-furan-3-ylsulfanyl)-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid