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[(1R,2R,5R,6S,7S,8R,9R,11R,13R,14S)-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-1,5,7,9,11,13-hexamethyl-4,12,16-trioxo-3,15,17-trioxabicyclo[12.3.0]heptadecan-6-yl] prop-2-enyl carbo


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