1-{(1R,2S,3S)-5-Benzyloxy-3-(tert-butyl-dimethyl-silanyloxy)-1-[(S)-1-(tert-butyl-dimethyl-silanyloxymethyl)-2-(tert-butyl-diphenyl-silanyloxy)-ethyl]-2-methyl-pentyloxymethyl}-4-methoxy-benzene