(1R,2R,3R,6S,7aR)-6-amino-3-(hydroxymethyl)hexahydro-1H-pyrrolizine-1,2-diol

(1R,2R,3R,6R,7aR)-1,2-bis(benzyloxy)-3-[(benzyloxy)methyl]-6-(methylsulfonyloxy)hexahydro-1H-pyrrolizine