7-beta(r*)))-

amino)-8-oxo-3-(((1-sulfomethyl)-1h-tetrazol-5-yl)thio)methyl)-,(6r-(6-alpha,

(6R,7R)-7α-[[(R)-Hydroxyphenylacetyl]amino]-8-oxo-3-[[[1-(sulfomethyl)-1H-tetrazol-5-yl]thio]methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

(7R)-7-(2-Hydroxy-2-phenylacetylamino)-6-oxo-3-{[1-(sulfomethyl)(1,2,3,4-tetraazol-5-ylthio)]methyl}-2H,7H,7aH-azetidino[2,1-b]1,3-thiazine-4-carboxylic acid