The present invention provides compounds represented by formula (I):
wherein R1 independently represents a halogen atom, hydroxy, nitro, an optionally halogenated alkyl, alkenyl or alkynyl, an optionally substituted alkoxy, an acyl, or an optionally substituted amino; R2 represents hydrogen atom or an optionally substituted hydrocarbon group; R3 represents an electron-withdrawing group; n represents an integer of 0 to 2; and m represents an integer of 1 to 6 (hereinafter sometimes briefly referred to as Compound (I)); or salts thereof. These compounds are capable of binding to macrophage migration inhibitory factor (MIF) and useful as agents for preventing/treating diseases induced by oxidative stress.