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[(1S,2S,3R,4S,7R,9S,10S,12R,15R,16S)-4-Acetyloxy-2-hydroxy-9,12-dimethoxy-10,14,20,20-tetramethyl-11,18-dioxo-6,17,19-trioxapentacyclo[11.6.1.01,16.03,10.04,7]icos-13-en-15-yl] (2R,3S)-2-hydroxy-3-[(2-methylpropan-2-yl)oxycarbonylamino]-3-pyridin-2-ylprop


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