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(1R,4S,5S,6S)-1-{(1S,2R,3R,4E)-2-(acetyloxy)-5-[formyl(methyl)amino]-1,3-dimethylpent-4-en-1-yl}-6-[(2S,4E,6R,8R,10E,12S,15R,16R,17R,18R,20E,22E)-16,18-dihydroxy-6,12-dimethoxy-8,11,15,17-tetramethyl-24-oxooxacyclotetracosa-4,10,20,22-tetraen-2-yl]-5-hydr