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(1S,5S,6S,7R,11R,12R,16R,19S)-7-Hydroxy-11,14,14,18,21,21-hexamethyl-19-triethylsilyloxy-2,4,13,15-tetraoxapentacyclo[15.3.1.01,5.06,11.012,16]henicos-17-en-3-one


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