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Nitrosoureido sugars with amino acid and dipeptide ester residue were characterized by 1H, 13C and 15N NMR and their spectra were assigned using 1D and 2D NMR methods. The N-nitrosation of ureido sugars frequently yields a mixture of isomers. In the case of ureido sugars with amino acid residues preferably the N3-NO isomers were obtained, whereas for compounds with dipeptide esters the N1-NO isomers...
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