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Tert-butyl [(1S,5S,6R,7R,11R,13S,14S,16R,19S)-7-hydroxy-14,18,21,21-tetramethyl-13,16-bis[(2-methylpropan-2-yl)oxycarbonyloxy]-3,9,15-trioxo-2,4,10-trioxapentacyclo[15.3.1.01,5.06,14.07,11]henicos-17-en-19-yl] carbonate


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