(2R,3R)-2-[(1S,2R,5S,6S,7R,8S)-10-(tert-Butyl-diphenyl-silanyloxy)-2-(3,4-dimethoxy-benzyloxymethoxy)-1,5,7-trimethyl-6,8-bis-triethylsilanyloxy-decyl]-5-methoxy-3-methyl-tetrahydro-furan