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2-dimethylamino-3-methoxy-propionic acid 24-[8-acetoxy-6-(2-dimethylamino-propionyloxy)-2-hydroxy-11,11-dimethoxy-1,3,7,9-tetramethyl-undecyl]-10-hydroxy-14,20-dimethoxy-9,11,15,18-tetramethyl-2-oxo-oxacyclotetracosa-3,5,15,21-tetraen-8-yl ester