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[(1R,2R,6S,7R,8S,9S)-8-[Tert-butyl(dimethyl)silyl]oxy-11-oxospiro[3,5,10,12-tetraoxatricyclo[7.3.0.02,6]dodecane-4,1'-cyclohexane]-7-yl] (1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carboxylate


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