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(1S,5S,6R,7S,8S,10S,11S,13R)-8-Bromo-11,15,18,18-tetramethyl-10,13-bis(triethylsilyloxy)spiro[2,4-dioxatetracyclo[12.3.1.01,5.06,11]octadec-14-ene-7,2'-oxirane]-3,12,16-trione


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