Ceftobiprole Impurity 53

(6R,7R) -7- ((Z) -2- (5-amino-1,2,4-thiadiazol-3-yl) -2- (((R) -2- ((Z) -2- (5-amino-1,2,4-thiadiazol-3-yl) -2- (hydroxyimino) acetamido) -2- ((R) -4-carboxy-5- ((E) - ((R) -2-oxo-[1,3'-bipyrrolidin]-3-ylidene) methyl) -3,6-dihydro-2H-1,3-thiazin-2-yl) acetoxy) imino) acetamido) -3- ((E) - ((R) -1'- (((5-methyl-2-oxo-1,3-dioxol-4-yl) methoxy) carbonyl) -2-oxo-[1,3'-bipyrrolidin]-3-ylidene) methyl) -8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid