DIPHENYLMETHYL(7R)-3-(MESYLOXY)-7-(PHENYLACETAMIDO)-3,4-DIDEHYDROCEPHAM-4-CARBOXYLATE;CeftibutenRelatedImpurity5;5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid,3-[(methylsulfonyl)oxy]-8-oxo-7-[(2-phenylacetyl)amino]-,diphenylmethylester,(6R,7R)-;CeftibutenImpurity5;CeftibutenImpurity22;(7R)-Benzhydryl3-((methylsulfonyl)oxy)-8-oxo-7-(2-phenylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate;(6R,7R)-Benzhydryl3-((methylsulfonyl)oxy)-8-oxo-7-(2-phenylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
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