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A new bisxanthone, named bijaponicaxanthone C, was isolated from the whole plant of Hypericum japonicum. The structure was elucidated as 6-[1',5',6'-trihydroxy-2′′′-(β-hydroxy-β-methylethyl)-2′′′,3′′′-dihydrofuran(5′′′,4′′′,3 ',4')xant