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(1R,4S,8S,9S,10S,11R,12S,13R,15R,17R)-11-Bromo-9-hydroxy-3,14,14,17-tetramethylspiro[5,7-dioxapentacyclo[10.5.1.01,8.04,8.013,15]octadec-2-ene-10,2'-oxirane]-6,18-dione


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