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  • 2-[(R)-2-{(2S,3S)-1-(Allyloxycarbonyl-chloro-methyl)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-4-(tert-butyl-dimethyl-silanyloxy)-butyrylsulfanylmethyl]-malonic acid diethyl ester

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