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A new oligosaccharide citric acid derivative was isolated by hot aqueous extraction at 85 °C from Vigna angularis seeds, and it was purified using anion exchange chromatography DE-52. The structure was inferred by using UV, 1 D and 2 D NMR spectroscopy and HR-MALDI/MS, and identified as α-D-galactopyranosyl-(1→6)-α-D-galactopyranosyl-(1→6)-α-D-glucopyranosyle-(1→2)-β-D-fructofuranosyle citric acid. The isolated oligosaccharide citric acid derivative revealed promising anti-influenza A virusdoi:10.6084/m9.figshare.8188250.v1 fatcat:5sox7xzumba45h4smivaoqyrpe