Provided is a catalase inhibitor comprising a compound represented by formula (I): wherein R 1 to R 4 independently represent a hydrogen atom, a halogen atom, an amino group, a hydroxyl group, a carbonyl group,or a hydrocarbon group having 1 to 4 carbon atoms, wherein the hydrocarbon group may have at least one substituent selected from the group consisting of a halogen atom, an amino group, a hydroxyl group and a carbonyl group; and X - represents an anionic chemical species.
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