105275-74-9 3-(4-Carbamoylphenoxy)-6-(1-hydroxyethyl)-7-oxo-4-thia-1-azabicyclo(3,2,0)hept-2-ene-2-carboxylate 4-Thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-(4-(aminocarbonyl)phenoxy)-6-(1-hydroxyethyl)-7-oxo-, (5R-(5alpha,6alpha(R*)))- Hre 664 Hre-664