(2S)-2-tert-butyldimethylsilyloxy-3-[(2S,3S,4S,5R)-4-tert-butyldimethylsilyloxy-3,5-dimethyl-6-oxotetrahydropyran-2-yl]propanal

(3R,4S,5R,6S)-6-((2S)-2-tert-butyldimethylsilyloxy-3-hydroxypropyl)-4-tert-butyldimethylsilyloxy-3,5-dimethyltetrahydropyran-2-one