(6R-(6alpha,7alpha,7(S*)))-7-((Carboxy(4-hydroxyphenyl)acetyl)amino)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-oxa-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid 5-Oxa-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-((carboxy(4-hydroxyphenyl)acetyl)amino)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-, (6R-(6alpha,7alpha,7(S*)))- 7-((Carboxy(4-hydroxyphenyl)acetyl)amino)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-oxa-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid (6R-(6alpha,7alpha,7(S*)))- 79120-38-0 7beta-(2-Carboxy-2-(4-hydroxyphenyl)acetamido)-7alpha-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-1-oxa-1-dethia-3-cephem-4-carboxylic acid