2,2-Dimethyl-propionic acid (2S,3R,4S)-3-(tert-butyl-dimethyl-silanyloxy)-5-(4-methoxy-benzyloxy)-2,4-dimethyl-pentyl ester

(2R,3R,4S)-3-(tert-butyldimethylsilyloxy)-5-(4'-methoxy-benzyloxy)-2,4-dimethylpentanal