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(1S,5S,6R,7S,10R,12S,13S,18S)-18-[Tert-butyl(dimethyl)silyl]oxy-7-hydroxy-13,17,20,20-tetramethyl-12-(phenylmethoxymethoxy)-2,4,9-trioxapentacyclo[14.3.1.01,5.06,13.07,10]icos-16-ene-3,15-dione


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