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Two new xanthone glycosides,tetraswerosides A and B,were isolated from the whole plant of Swertia tetraptera.Their structures were determined as 3-O-b-D-glucopyranosyl-1-hydroxy-4,7-dimethoxyxanthone and 3-O-[b-D-xylopyranosyl-(1→6)-b-D-glucopyranosyl]-1-