(2S,3R,4R,5R)-N-butyloxycarbonyl-3,4-bis(benzyloxy)-5-<(benzyloxy)methyl>pyrrolidine-2-carbaldehyde

(2R,3R,4R,5R)-3,4-Bis-benzyloxy-2-benzyloxymethyl-5-methanesulfonyloxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester