The present invention relates to compounds of general formula (I): wherein: R1 and R2, identical or different, represent: an atom of hydrogen or halogen, CN or NO2, with R1 and R2 not representing hydrogen simultaneously, m represents: 1 or 2 n represents: 0, 1 or 2 R3 represents: phenyl substituted or not by one or more residues chosen among halogen, hydroxyl or C1-C6 alkyl; C2-C6 alkyl substituted or not by one or more residues chosen among halogen or hydroxyl; cycloalkyl; pyridine; thiophene; pyrrole substituted or not by C1-C6 alkyl; thiazole or furan; or the therapeutically-acceptable salts or solvates thereof.