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  • (5R,6S)-6-[1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-tert-butylsulfanylmethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester

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