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8-[(1'R,2'R,3'S,6'R,7'S,8'R)-2',7'-di(tert-butyldimethylsilyl)oxy-(1',3',7'-trimethyl)-non-4'-one]-20-[(triethylsilyl)oxy]-9-methoxy-1,3,13-trimethyl-16-pentyl-7,17,19-trioxabicyclo[13.4.1]eicosa-2,4,10,12-tetraene-6-one