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  • (2R,3aR,6S,7R,7aR)-2-((S)-2-tert-Butoxycarbonylamino-2-methoxycarbonyl-ethyl)-7-(tert-butoxycarbonyl-methyl-amino)-6-hydroxy-hexahydro-furo[3,2-b]pyran-2-carboxylic acid methyl ester

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