Patent ID: 7109194

Claim:
A compound of formula (I) wherein X represents a hydrogen or halogen atom, R 1 represents a hydrogen atom or a (C 1 –C 4 )alkyl group, R 2 and R 3 each represent, independently of one another, a hydrogen atom or a (C 1 –C 4 )alkyl group or else R 2 and R 3 form, with the nitrogen atom which carries them, a pyrrolidinyl, piperidinyl, morpholinyl or 4-alkylpiperazinyl group, and Het represents a heteroaryl group selected from pyridinyl, 1-oxidopyridinyl, quinolinyl, isoquinolinyl, pyrimidinyl, pyrazinyl and pyridazinyl, optionally substituted with one or more halogen atoms and/or one or more (C 1 –C 4 )alkyl or (C 1 –C 4 )alkoxy groups, or a hydrate, or acid addition salt thereof.