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  • (4R,5S,6S)-4-Methyl-7-oxo-3-((R)-5-oxo-1-triethylsilanyl-pyrrolidin-3-ylsulfanyl)-6-((R)-1-trimethylsilanyloxy-ethyl)-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

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