1-Azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-((2-(acetylamino)ethyl)thio)-6-ethyl-7-oxo-, monosodium salt 3-(2-Acetamidoethyl)thio-6-ethyl-7-oxo-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid 67007-79-8 PS 5 PS-5