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(1S,5S,6R,7S,11R,13S,14S,16R)-7-Hydroxy-14,18,21,21-tetramethyl-13,16-bis(triethylsilyloxy)-2,4-dioxa-9,10-dithiapentacyclo[15.3.1.01,5.06,14.07,11]henicos-17-ene-3,15,19-trione


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