(R)-2-((4S,5R,6S)-6-((2S,4R)-5-(4-methoxybenzyloxy)-4-methylpentan-2-yl)-2,2,5-trimethyl-1,3-dioxan-4-yl)propanoic acid

(2S,3R)-2-methyl-3-<(triethylsilyl)oxy>pentanal