(Z)-2-[(2R,3S,4S,5R)-4,5-Bis-(tert-butyl-dimethyl-silanyloxy)-3-(4-methoxy-benzyloxy)-tetrahydro-pyran-2-yloxymethyl]-3-[(1S,2R,6R)-6-isopropyl-3-methyl-2-((2S,3S)-3-methyl-2,3-bis-triethylsilanyloxy-pent-4-ynyl)-cyclohex-3-enyl]-propenal