A compound having the following general formula (I): wherein: X is a nitrogen atom and Y is a carbon atom； or X is a carbon atom and Y is a nitrogen atom； the Ar group is an aryl or heteroaryl group； and the RN and RN' groups, together with the carbon atoms to which they are bound, form a monocyclic or bicyclic azacycloalkane group. The pharmaceutically acceptable salts thereof, the hydrates or polymorphic crystalline structures thereof, and to the racemates, diastereoisomers, or enantiomers thereof are also described.
