Compound of general formula (I): in which: X represents a CH group or a nitrogen atom Ra represents a hydrogen atom, a group C1-5-alkyl, a group hydroxy-C2-5-alkyl, a group C1-5-alkoxy-C2-5-alkyl or a group fluoro-C2-5-alkyl Rb represents a hydrogen atom or a fluorine atom Rc represents a pyrazole ring linked to the phenyl via a carbon atom or via a nitrogen atom, the pyrazole ring being optionally substituted on a carbon atom with a hydrogen atom, a group C1-5-alkyl, a group hydroxy-C1-5-alkyl, a group C1-5-alkoxy-C1- 5-alkyl, a formyl group, a group C1-5-alkoxycarbonyl, a group (mono-C1-5-alkyl)amino- C1-5-alkyl, a group (di-C1-5-alkyl)amino-C1-5-alkyl, a group amino-C1-5-alkyl or a group fluoro-C1-5-alkyl in base form or in the form of a pharmaceutically acceptable acid- addition salt.
