(6R-(6alpha,7beta(S*)))-3-(Acetoxymethyl)-7-(5-amino-5-carboxyvalerylamino)-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, potassium salt
(6R-(6alpha,7beta(S*)))-3-(Acetoxymethyl)-7-(5-amino-5-carboxyvalerylamino)-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, potassium salt