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  • (2S,3S,4S,5S,6R,9S,11S)-4-(tert-Butyl-dimethyl-silanyloxy)-2-[(2S,3S)-2-(tert-butyl-dimethyl-silanyloxy)-3-methyl-hept-6-ynyl]-9-ethyl-3,5,11-trimethyl-1-oxa-7-aza-spiro[5.5]undecan-8-one

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