DOOS-20 of each purified oligosaccharide (5–20 mg) was dissolved in 0.4 mL D2O (99.8 Atom% Deuterium; Schweres Wasser, United States), separately. Nuclear magnetic resonance (NMR) spectra were recorded using the Bruker Avance III 600 Spectrometer (Bruker Instruments, Inc., Billerica, MA, United States) at 25°C. All the experiments were recorded, and data were processed using standard Bruker software and MestReNova.
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