(6R,7R)-3-acetoxymethyl-8-oxo-7-(2-tetrazol-1-yl-acetylamino)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylate, sodium (6R-trans)-3-(acetoxymethyl)-8-oxo-7-(1H-tetrazol-1-ylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate, Sodium 7-(1H-tetrazol-1-yl)acetamidocephalosporanate, Sodium, 7β-(2-tetrazol-1-yl-acetylamino)-cephalosporanic acid, sodium salt,