| abstract |
The present invention provides compounds of formula (I) and their addition salts with pharmaceutically acceptable acids or bases, and drugs containing them:n n n n n n n n Wheren n n R 1 and R 2 together form a benzo ring substituted or unsubstituted by a halogen atom or an alkyl, alkoxy, cyano, nitro, hydroxy, amino, alkylamino, dialkylamino or trifluoromethyl group, R 3 represents a hydrogen atom, orn n n R 1 represents a hydrogen atom, R 2 and R 3 together are substituted or substituted by a halogen atom or an alkyl, alkoxy, cyano, nitro, hydroxy, amino, alkylamino, dialkylamino or trifluoromethyl group To form a non-benzoic ring. |