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Comparative NMR analysis of α- and β-1H/15N-resonances of unreduced unsaturated 4- (A), and 6-sulfated (B) CS dimers obtained from ABC lyase digestion, using 1H-15N gHSQC spectra. The β-/β-signals arises from mutarotation of anomerics in aqueous solution, which the equilibrium ratio is 3.5/6.5.
