5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 7-amino-3-chloro-8-oxo-, (4-nitrophenyl)methyl ester, (6R-trans)-;4-Nitrobenzyl 7-amino-3-chloro-3-cephem-4-carboxylate; p-Nitrobenzyl7-amino-3-chloro-3-cephem-4-carboxylate
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