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[(1S,5S,6S,10S,11S,13R,16S)-7-(Bromomethyl)-11,15,18,18-tetramethyl-3,12-dioxo-10,16-bis(triethylsilyloxy)-2,4-dioxatetracyclo[12.3.1.01,5.06,11]octadeca-7,14-dien-13-yl] acetate


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