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  • (4S,5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[1,3]dithian-2-ylidene-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid benzhydryl ester

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