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(1R,2R,5R,7R,8R,9R,11R,14R)-8-[[(3Ar,4S,6R,7aS)-1,6-dimethyl-2-oxo-4,6,7,7a-tetrahydro-3aH-pyrano[4,3-d][1,3]oxazol-4-yl]oxy]-2-ethyl-9-methoxy-1,5,7,9,11-pentamethyl-3,15,17-trioxabicyclo[12.3.0]heptadecane-4,6,12,16-tetrone


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