Patent ID: 6927209

Claim:
Compounds of formula (I): in which: R 1 , R 2 and R 3 , are each independently: a (C 1 -C 6 )alkyl group, a pyridinyl group or a group —CH 2 —NR 4 R 5 , in which R 4 and R 5 are each independently a hydrogen atom or a (C 1 -C 4 )alkyl group, or alternatively R 4 and R 5 form, with the nitrogen atom to which they are bonded, a pyrrolidinyl, piperidinyl, hexahydroazepinyl, morpholinyl or piperazinyl group, with the proviso that at least one of the substituents R 1 , R 2 and R 3 is other than a (C 1 -C 6 )alkyl group, and their salts, solvates and hydrates, which are pharmaceutically acceptable.