(2S,3R,4R,5R)-1-tert-butyl 2-ethyl 3,4,5-trihydroxypiperidine-1,2-dicarboxylate

(2S,3R,4R,5R)-methyl 2,6-dideoxy-2,6-imino-3,4-O-isopropylidene-D-mannonate

N-benzyloxycarbonyl-3-O-benzyl-2,6-dideoxy-2,6-imino-D-mannurono-1,4-lactone

methyl N-benzyloxycarbonyl-3-O-benzyl-2,6-dideoxy-2,6-imino-α-D-mannofuranoside

methyl 3,4,5,6-di-O-isopropylidene-2-amino-2-deoxy-D-mannate