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(4S,5S)-4-[(1S,2R,3S,4S,6R)-4-[Tert-butyl(dimethyl)silyl]oxy-3-methyl-1-phenylmethoxy-3-prop-2-enyl-7-oxabicyclo[4.2.0]octan-2-yl]-6,6,8-trimethyl-1,3-dioxaspiro[4.5]decane-2,7-dione


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