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Three new anthraquinones, emodin-8-β-D-(2'-O-coumarate)glucoside 1, emodin-8-β-D-(6′-O-acetyl)glucoside 2 and physicon-8-β-D-(6′-O-acetyl)glucoside 3, were isolated from the roots of Polygonum cillinerve and their structures were established by spectr