2-(3-{6-[4-(tert-butoxy-diphenyl-silanyloxy)-but-2-ynyl]-3,6-dihydro-2H-pyran-2-yl}-2-methyl-propyl)-9-(tert-butyl-dimethyl-silanyloxy)-8-(4-methoxy-benzyloxy)-11-(4-methyl-3,6-dihydro-2H-pyran-2-yl)-undeca-1,5,10-trien-4-one

(2R,6R)-6-[4-(tert-Butoxy-diphenyl-silanyloxy)-but-2-ynyl]-2-((S)-2-methyl-4-trimethylsilanylmethyl-pent-4-enyl)-3,6-dihydro-2H-pyran