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  • (6R,7R)-7-(2-tert-Butoxycarbonylamino-2-phenyl-acetylamino)-8-oxo-3-(1-trityl-1H-[1,2,3]triazol-4-ylsulfanylmethylsulfanyl)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester

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