4-Thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-(((aminocarbonyl)oxy)methyl)-6-((1R)-1-hydroxyethyl)-7-oxo-, monosodium salt, (5R,6S)- 4-Thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-(((aminocarbonyl)oxy)methyl)-6-(1-hydroxyethyl)-7-oxo-, monosodium salt, (5R-(5-alpha,6-alpha(R*)))- 84845-57-8 84845-58-9 FCE 22101 Ritipenem Ritipenem sodium salt