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  • (S)-2-(N'-tert-Butoxycarbonyl-N-{(R)-2-[(2S,3S)-2-((S)-sec-butyl)-1-(tert-butyl-dimethyl-silanyl)-4-oxo-azetidin-3-yloxy]-4-methyl-pentanoyl}-hydrazino)-4-methyl-pentanoic acid benzyl ester

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