(2R,3R,4R,5S)-4-Formyl-2,3-(isopropylidenedioxy)-5-<(1R)-1,2-(isopropylidenedioxy)ethyl>-4-<4-(tert-butyldimethylsilyloxy)butyl>tetrahydrofuran

(2R,3R,4R,5S)-2,3-(Isopropylidenedioxy)-5-<(1R)-1,2-(isopropylidenedioxy)ethyl>-4-<3,3-bis(methoxycarbonyl)propyl>-4-vinyltetrahydrofuran

(3aS,4S,7aR)-4-<(1S)-2-(Benzyloxy)-1-hydroxyethyl>-4-(hydroxymethyl)hexahydrobenzofuran-2(3H)-one

Formic acid (S)-2-benzyloxy-1-((3aS,4R,7aR)-4-formyl-2-oxo-octahydro-benzofuran-4-yl)-ethyl ester