5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 7-amino-8-oxo-, (6R-trans)-;7b-Amino-3-cephem-4-carboxylicacid;Ceph-3-em-4-carboxylic acid, 7b-amino-;
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