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(1S,5S,6R,7R,9R,12R,13R,17R,20S)-12,15,15,19,22,22-Hexamethyl-20-triethylsilyloxy-7-trimethylsilyloxy-2,4,14,16-tetraoxahexacyclo[16.3.1.01,5.06,12.07,9.013,17]docos-18-en-3-one


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