Synonyms: 4-Thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylicacid, 6-(1-hydroxyethyl)-7-oxo-, 2-propenyl ester, [5S-[5a,6b(S*)]]-;4-Thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,6-[(1R)-1-hydroxyethyl]-7-oxo-, 2-propenyl ester, (5S,6S)- (9CI); SB 213883