Abstract
In this paper we present a newly developed 2D selective-TOCSY-HSQC experiment for unambiguous assignment of individual sugar components of a biantennary undecasaccharide. The correlation signals between the protons and carbons of a selectively excited sugar component in the undecasaccharide were observed in a 2D selective-TOCSY-HSQC experiment. The network of proton signals of this sugar was observed in a 2D selective-TOCSY-DQFCOSY experiment. These two experiments enabled us to perform unambiguous sequential assignment of both protons and carbons of the individual sugar components in the undecasaccharide. In addition, a three-dimensional structural analysis was performed by a 2D selective-TOCSY-NOESY experiment, which clearly distinguishes between inter-sugar and intra-sugar ring NOE signals.
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