Synonyms: 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 7-[[(2R)-amino(4-hydroxyphenyl)acetyl]amino]-8-oxo-3-(1-propenyl)-,monohydrate, (6R,7R)- (9CI);5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 7-[[amino(4-hydroxyphenyl)acetyl]amino]-8-oxo-3-(1-propenyl)-,monohydrate, [6R-[6a,7b(R*)]]-;