2-((2S,3R,4aS,5aR,6aS,8R,9S,10aR,11aS,13aR)-3,9-bis((tert-butyldimethylsilyl)oxy)-4a,8-dimethyltetradecahydro-2H-pyrano[3,2-b]pyrano[2',3':5,6]pyrano[2,3-f]oxepin-2-yl)acetaldehyde

(((2S,3R,5S,6R)-5-(benzyloxy)-6-methyl-2-(((2S,3S)-3-tosyloxiran-2-yl)methyl)tetrahydro-2H-pyran-3-yl)oxy)(tert-butyl)dimethylsilane