(4R,5S,6S)-3-((3R,4R)-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

(4R,5S,6S)-3-[(3S,5S)-5-(2-Dimethylcarbamoyl-ethylcarbamoyl)-1-(4-nitro-benzyloxycarbonyl)-pyrrolidin-3-ylsulfanyl]-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester

p-nitrobenzyl (1R,5S,6S)-6-[(R)-1-hydroxyethyl]-1-methyl-2-[(2R,4S)-2-[3-(N-methyl-N-p-nitrobenzyloxycarbonylamino)propyl]-N-p-nitrobenzyloxycarbonylpyrrolidin-4-ylthio]-1-carbapen-2-em-3-carboxylate

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