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Ethyl (2E,4E,6E,8R,9R,10E,12Z,16S,17S)-9-[(2R,3S,4R,5S,6S)-3,4-bis[[tert-butyl(dimethyl)silyl]oxy]-5-methoxy-6-methyloxan-2-yl]oxy-16-[tert-butyl(dimethyl)silyl]oxy-18-[(4S,5R)-5-[(2R,3R,4S,5S,6R)-4-[tert-butyl(dimethyl)silyl]oxy-6-[(2R)-2-[(2R,4S,5S,6S)-


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