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(1R,2S,3S,4S,5Z,6R,10S,11R,13S,17S)-5-Benzylidene-11-[[tert-butyl(dimethyl)silyl]oxymethyl]-17-ethenyl-3,4-dimethyl-7,9,18-trioxapentacyclo[9.6.1.01,13.02,6.06,10]octadec-14-en-8-one


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