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(1S,5S,6R,7S,10R,12S,13S,15R)-9-Benzyl-7-hydroxy-13,17,20,20-tetramethyl-12,15-bis(triethylsilyloxy)-2,4-dioxa-9-azapentacyclo[14.3.1.01,5.06,13.07,10]icos-16-ene-3,14,18-trione


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