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(2E,4E,10E,12E)-(1S,8R,9S,15R,16S,20S)-8-[(1R,2R,3S)-2-(tert-Butyl-dimethyl-silanyloxy)-1,3-dimethyl-4-oxo-pentyl]-9-methoxy-1,3,13-trimethyl-16-pentyl-20-triethylsilanyloxy-7,17,19-trioxa-bicyclo[13.4.1]icosa-2,4,10,12-tetraen-6-one