(2R,3R,4R,5R,6S)-5-(tert-Butyl-dimethyl-silanyloxy)-3-(4-methoxy-benzyloxy)-2,4,6-trimethyl-7-trityloxy-heptanal

(S)-2-(tert-Butyl-dimethyl-silanyloxy)-3-((2S,3R)-3-methyl-6-oxo-tetrahydro-pyran-2-yl)-propionaldehyde