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(R)-6-{(1E,3Z,7E,9E)-(5R,11S)-11-(tert-Butyl-dimethyl-silanyloxy)-11-[(2R,4S,5S,6R)-4-(tert-butyl-dimethyl-silanyloxy)-5-methyl-6-((E)-propenyl)-tetrahydro-pyran-2-yl]-3,5,7-trimethyl-undeca-1,3,7,9-tetraenyl}-5,6-dihydro-pyran-2-one