4-((4R,6R)-6-{(2S)-3-[1,1-bis(1-methylethyl)-2-methyl-1-silapropoxy]-2-[(4-methoxyphenyl)methoxy]propyl}-2,2-dimethyl(1,3-dioxan-4-yl))(2S,3R)-2-methyl-3-(tert-butyldimethylsilyloxy)butan-1-one