cas no:54639-48-4||chemical formula:c28h24n2o5s||molecular weight:500.56900||exact mass:500.14059||benzhydryl (6r,7r)-3-hydroxy-8-oxo-7-(2-phenylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
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