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(1S,5S,6R,7R,8R,10S,11R,13R,16S)-7-Ethyl-7,8-dihydroxy-10,11,13,15,18,18-hexamethyl-16-trimethylsilyloxy-2,4-dioxatetracyclo[12.3.1.01,5.06,11]octadec-14-ene-3,12-dione


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