106559-89-1 4-Thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 6-(1-hydroxyethyl)-7-oxo-3-(tetrahydro-2-furanyl)-, monopotassium salt, (5R-(3(R*),5-alpha,6-alpha(R*)))- Potassium (1'R,2''R,5R,6S)-6-(1'-hydroxyethyl)-2-(2''-tetrahydrofuranyl)-penem-3-carboxylate SUN 4435