Cefazolin Impurity 105

(2R) -2- ((R) - (2- (1H-tetrazol-1-yl) acetamido) (carboxy) methyl) -3- ((6R,7R) -7- (2- (1H-tetrazol-1-yl) acetamido) -3- (((5-methyl-1,3,4-thiadiazol-2-yl) thio) methyl) -8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carbonyl) -5- (((5-methyl-1,3,4-thiadiazol-2-yl) thio) methyl) -3,4-dihydro-2H-1,3-thiazine-4-carboxylic acid