The present invention aims to provide a therapeutic agent for chronic renalfailure, comprising as an effective ingredient a compound represented byGeneralFormula (1) or a pharmaceutically acceptable salt thereof. That is, thepresentinvention provides provision of a drug comprising as an effective ingredient acompound represented by General Formula (1) or a pharmaceutically acceptablesaltthereof, which drug is useful not only for amelioration of renal function, butalso foramelioration of anemia, activation of SOD and excretion of uremic substances.