4-Thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-(ethylthio)-6-((1R)-1-hydroxyethyl)-7-oxo-, (5R,6S)- 4-Thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-(ethylthio)-6-(1-hydroxyethyl)-7-oxo-, (5R-(5alpha,6alpha(R*)))- 6-(1-Hydroxyethyl)-2-ethylthiopenem-3-carboxylic acid 77646-83-4 Sch 29482 Sch-29482