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  • (2S,5R,6S,7S)-7-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5-methyl-4,8-dioxo-3-thia-1-aza-bicyclo[4.2.0]octane-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

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