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Propionic acid (11E,13E)-(4R,5S,6S,7R,9R,16R)-6-((2S,3R,4S,5S,6R)-4-dimethylamino-3,5-dihydroxy-6-methyl-tetrahydro-pyran-2-yloxy)-5-methoxy-9,16-dimethyl-2,10-dioxo-7-(2-oxo-ethyl)-oxacyclohexadeca-11,13-dien-4-yl ester