5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 7-amino-8-oxo-, diphenylmethyl ester, (6R-trans)-;Diphenylmethyl 7b-amino-3-cephem-4-carboxylate;5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 7-amino-8-oxo-, diphenylmethyl ester, (6R,7R)-;
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