2,3-Di-O-benzyl-4-O-(tert-butyldimethylsilyl)-D-erythrose

(2R,3R)-2,3-bis(benzyloxy)-4-hydroxybutanoic acid 1,4-lactone

(2R,3R)-2,3-Bis(benzyloxy)-4-hydroxy-N-methoxy-N-methylbutanamide