A rodenticidal compound of formula (I): as well as the isomers thereof, in particular enantiomers, diastereoisomers, tautomers or mixtures of isomers in all proportions, where: R1 is: H or (II) or (III) with X=H, OH, Cl, Br, F or N02; R2 is: (IV) or (V) or (VI) with X=H, OH, Cl, Br, F or NO2; R3 is: O or S or (VII) with X=H, OH, Cl, Br, F or N02. Compositions containing such compounds as well as a method of use thereof in controlling harmful rodents are also described.