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(1S,4S,5S,7R,10S,11R,12S,16S,19R)-10-Hydroxy-4,19,21,21-tetramethyl-2-methylidene-5-triethylsilyloxy-8,13,15,20-tetraoxahexacyclo[14.4.1.01,19.04,11.07,10.012,16]henicosan-14-one


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