cas no: | chemical formula:c19h18n6o6s2 |(6r,7r)-7-((s)-2-(formyloxy)-2-phenylacetamido)-3-(((1-methyl-1h-tetrazol-5-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
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