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Ertapenem Dimer 4 Ertapenem Dimer II Ertapenem Impurity 5 Ertapenem Dimer Ester ErtapeneM DiMer Ester IMpurity Ertapenem Impurity 11 (Ertapenem Dimer Ester Impurity) 1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, 3-[[(3S,5S)-5-[[[3-[[(1R,2S)-2-carboxy-2-[(2S,3R)-5-carboxy-4-[[(3S,5S)-5-[[(3-carboxyphenyl)amino]carbonyl]-3-pyrrolidinyl]thio]-3,4-dihydro-3-methyl-2H-pyrrol-2-yl]-1-methylethoxy]carbonyl]phenyl]amino]carbonyl]-3-pyrrolidinyl]thio]-6-[(1R)-1-hydrox... (4R,5S,6S)-3-[[(3S,5S)-5-[[[3-[[(1R,2S)-2-Carboxy-2-[(2S,3R)-5-carboxy-4-[[(3S,5S)-5-[[(3-carboxyphenyl)aMino]carbonyl]-3-pyrrolidinyl]thio]-3,4-dihydro-3-Methyl-2H-pyrrol-2-yl]-1-Methylethoxy]carbonyl]phenyl]aMino]carbonyl]-3-pyrrolidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-Methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic Acid