5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid,7-((((4-carboxy-2,3-dihydro-3-oxo-5-isothiazolyl)thio)acetyl)amino)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-, (6R-cis)- 69712-30-7