Patent ID: 7361687

Claim:
A compound of formula I: wherein: R 1 is aromatic group, where said aromatic is optionally substituted by one or more atoms or groups of atoms selected from the group consisting of halogen, C 1 -C 3 alkyl, C 1 -C 3 alkoxy, nitro, cyano, trifluoromethyl, and trifluoromethoxy; R 2 is hydrogen or C 1 -C 4 alkyl, where said C 1 -C 4 alkyl is optionally monosubstituted by a phenyl or —CONH 2 or optionally substituted by one or more fluorine atoms; R 3 is hydrogen or hydroxy; R 4 is hydrogen; or R 4 , together with R 3 , forms a —CH═N— or a straight or branched C 2 -C 4 alkylene; R 5 is hydrogen or C 1 -C 3 alkyl; R 6 is hydrogen or halogen; Y is straight or branched saturated C 2 -C 4 alkylene or straight or branched unsaturated C 2 -C 4 alkylene, where said C 2 -C 4 alkylene is optionally interrupted between two carbon atoms by an oxygen atom; or an acid addition salt thereof.