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