Patent ID: 6998403

Claim:
A compound selected from those of formula (I): wherein: R 1 and R 2 together form a benzo ring optionally substituted by halogen or by alkyl, alkoxy, cyano, nitro, hydroxy, amino, alkylamino, dialkylamino or trifluoromethyl, and R 3 and R 4 represent hydrogen, or R 1 and R 4 represent hydrogen and R 2 and R 3 together form a benzo ring optionally substituted by halogen or by alkyl, alkoxy, cyano, nitro, hydroxy, amino, alkylamino, dialkylamino or trifluoromethyl, or R 1 and R 2 represent hydrogen and R 3 and R 4 together form a benzo ring optionally substituted by halogen or by alkyl, alkoxy, cyano, nitro, hydroxy, amino, alkylamino, dialkylamino or trifluoromethyl, its enantiomers, diastereoisomers, and addition salts thereof with a pharmaceutically acceptable acid or base, it being understood that: the term “alkyl” denotes a linear or branched hydrocarbon chain having from 1 to 6 carbon atoms, the term “alkoxy” denotes a linear or branched alkyl-oxy group having from 1 to 6 carbon atoms.