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[(2R,3S,6R)-6-[[(3E,5E,8S,9E,11S,12R,13E,15E,18S)-12-[[(3As,4R,7S,7aS)-6,6-dimethyl-7-(2-methylpropanoyloxy)-2-oxo-3a,4,7,7a-tetrahydro-[1,3]dioxolo[4,5-c]pyran-4-yl]oxy]-8-[tert-butyl(dimethyl)silyl]oxy-18-[(1R)-1-[tert-butyl(dimethyl)silyl]oxyethyl]-11-


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