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  • [(2R,4S,6S,8R,10S)-4-(tert-Butyl-dimethyl-silanyloxy)-10-hydroxy-10-methyl-8-((S)-3-methyl-2-oxo-4-triethylsilanyloxy-butyl)-1,7-dioxa-spiro[5.5]undec-2-yl]-acetic acid tert-butyl ester

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