Synthesis and properties of 2,3,4,6-tetra-O-benzyl-1-O-(N-benzyloxycarbonyidipeptidyl)-alpha- and -beta-D-glucopyranoses and 1-O-dipeptidyl-D-glucopyranoses. Piperazinedione formation from 1-O-dipeptidul-D-glucopyranoses by intramolecular aminolysis.

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