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  • (2S,3S,5R,8S,10R)-3-(tert-Butyl-dimethyl-silanyloxy)-2-[(1S,3S)-1-(tert-butyl-dimethyl-silanyloxy)-3-methyl-7-oxo-oct-5-ynyl]-8,10-dimethyl-1-oxa-6-aza-spiro[4.5]decane-6-carboxylic acid tert-butyl ester

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