5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 3-(bromomethyl)-8-oxo-7-(2-phenylacetamido)-, tert-butyl ester, 5-oxide,stereoisomer (8CI); tert-Butyl 7b-(phenylacetamido)-3-(bromomethyl)-3-cephem-4-carboxylate 1b-oxide
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