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[(1S,2S,3R,4S,7R,9S,10S,12R,15R,16S)-4,15-Diacetyloxy-9,12-dihydroxy-10,14,20,20-tetramethyl-11,18-dioxo-6,17,19-trioxapentacyclo[11.6.1.01,16.03,10.04,7]icos-13-en-2-yl] propanoate


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