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10-(4-dimethylamino-6-methyl-3-trimethylsilanyloxy-tetrahydro-pyran-2-yloxy)-4-ethyl-11-methoxy-3a,7,9,11,13,15-hexamethyl-1-[4-(4-pyridin-3-yl-imidazol-1-yl)-butyl]-octahydro-3,5-dioxa-1-aza-cyclopentacyclotetradecene-2,6,8,14-tetraone