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Effects of xanthone derivatives in rat tail suspension tests. Data are represented as the mean seconds (SEM) of the total activity period during the final 6 minutes of a 9-minute session. Xanthone derivatives 1101 and 1105 were administered 1 hour before testing and venlafaxine hydrochloride was administered 45 minutes before testing. Each group contained 8 or 9 rats. *P < 0.05; †P < 0.01 versus vehicle-treated rats.
