Diphenylamine (N-Phenylbenzenamine, Anilinobenzene, C.I. 10355), a derivative of aniline, is widely used as an industrial antioxidant, dye mordant and reagent and is also employed in agriculture as a fungicide and antihelmintic. Diphenylamine can inhibits oxidative phosphorylationsignificantly, although its inhibition potency was weaker than that of NSAIDs with a diphenylamine structure.