3-((2-(((3-carboxyphenyl)amino)carbonyl)pyrrolidin-4-yl)thio)-4-methyl-6-(1-hydroxyethyl)-7-oxo-1-azabicyclo(3.2.0)hept-2-en-2-carboxylic acid monosodium salt
3-((2-(((3-carboxyphenyl)amino)carbonyl)pyrrolidin-4-yl)thio)-4-methyl-6-(1-hydroxyethyl)-7-oxo-1-azabicyclo(3.2.0)hept-2-en-2-carboxylic acid monosodium salt