5-Oxa-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-((hydroxyphenylacetyl)amino)-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-, (6alpha,7beta(R*))-(+-)- 62504-53-4 Oxacefamandole