(3R,4S,5R,6R)-1-allyl-3,4,5-tris(benzyloxy)-6-((benzyloxy)methyl)piperidin-2-one

5-(N-t-butyloxycarbonyl)amino-5-deoxy-1,2-O-isopropylidene-D-glucuronolactone

ethyl 2-((3aR,3bS,5R,6S,6aR,7aR)-6-((tert-butoxycarbonyl)amino)-5-hydroxy-2,2-dimethylhexahydrofuro[2',3':4,5]furo[2,3-d][1,3]dioxol-5-yl)acetate

(4R,5R)-4-hydroxy-5-((3aR,5R,6S,6aR)-6-hydroxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)pyrrolidin-2-one

ethyl (3S,4R)-4-((tert-butoxycarbonyl)amino)-3-hydroxy-4-((3aR,5R,6S,6aR)-6-hydroxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)butanoate