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  • (3'aS,4'R,6'aR)-4'-((3S,4S,E)-3-(tert-butyldimethylsilyloxy)-4-methyloct-1-en-6-ynyl)-5,5-dimethyltetrahydro-1'H-spiro[[1,3]-dioxane-2,2'-pentalen]-5'(3'H)-one

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