Ertapenem Impurity 66

(4R,5S,6S) -3- (((3S,5S) -5- ((3- ((2S,4S) -4- (((4R,5S) -2-carboxy-5- ((2R) -1-carboxy-2-hydroxypropyl) -4-methyl-4,5-dihydro-1H-pyrrol-3-yl) thio) -2- ((3-carboxyphenyl) carbamoyl) pyrrolidine-1-carbonyl) phenyl) carbamoyl) pyrrolidin-3-yl) thio) -6- ((R) -1-hydroxyethyl) -4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid