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  • (4R,5S,6S)-6-((R)-1-Hydroxy-ethyl)-3-{(2R,3S,4R)-2-hydroxymethyl-4-[(4-nitro-benzyloxycarbonylamino)-methyl]-oxetan-3-ylsulfanyl}-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester

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