(6R,7R)-1-((2-Carboxy-8-oxo-7-(2-(2-thienyl)acetamido)-5-thia-1-azabicyclo(4.2.0)oct-2-en-3-yl)methyl)pyridinium hydroxide, inner salt 1-((7'-beta-(2-(2-Thienyl)acetamido)-8'-oxo-1'-aza-5'-thiabicyclo(4.2.0)-oct-2'-en-3'-yl)methyl)pyridinium-2'-carboxylate 50-59-9 7-((2-Thienyl)acetamido)-3-(1-pyridylmethyl)cephalosporanic acid