Synonyms: 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid,7-[[(2R)-[[(4-hydroxy-6-methyl-3-pyridinyl)carbonyl]amino](4-hydroxyphenyl)acetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-,monosodium salt, (6R,7R)- (9CI);5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid,7-[[[[(4-hydroxy-6-methyl-3-pyridinyl)carbonyl]amino](4-hydroxyphenyl)acetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-,monosodium salt, [6R-[6a,7b(R*)]]-;Antibiotic SM 1652;Sodium (6R,7R)-7-{[(2R)-2-(4-hydroxyphenyl)-2-{[(6-methyl-4-oxo-1,4-dihydropyridin-3-yl)carbonyl]amino}acetyl]amino}-3-{[(1-methyl-1H-tetrazol-5-yl)sulfanyl]methyl}-8-oxo-5-thia-1-azabicyclo[4.2.0]oct -2-ene-2-carboxylate;5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid,7-[[(2R)-2-[[(4-hydroxy-6-methyl-3-pyridinyl)carbonyl]amino]-2-(4-hydroxyphenyl)acetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-,sodium salt (1:1), (6R,7R)-;Sepatren;Suncefal;Wy 44635;