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A new flavonol ologosaccharide,quercetin-3-O-[β-D-xylopyranosyl-(1→2)-α-L-rhamnopyranosyl-(1→6)]-β-D-glucopyranoside-3′-O-β-D-glucopyranoside, named aesculfavoside was inolated from Aesculus chinensis.It′s structure was elucidatede by spectra FAB-MS,1D NM