Patent ID: 7279575

Claim:
A compound of formula (I) wherein R is a hydrogen atom or a group selected from amino, arylamino, optionally substituted C 1 -C 6 alkylamino, optionally substituted arylalkylamino, heteroarylalkylamino, C 1 -C 6 dialkylamino and acylamino; R 1 and R 2 are, each independently, a hydrogen or halogen atom, a straight or branched C 1 -C 6 alkyl group, an amino or arylamino group; R 3 , R′ 3 , R 4 and R′ 4 are, each independently, a hydrogen atom or a group selected from straight or branched C 1 -C 6 alkyl, C 3 -C 6 cycloalkyl, heterocyclyl, aryl, cycloalkyl-alkyl, heterocyclyl-alkyl or aryl-alkyl; or R 3 and R 3 ′ or R 4 and R 4 ′, taken together, form a C 3 -C 6 cyclic alkyl group; R 5 is a hydrogen or halogen atom or a straight or branched C 1 -C 6 alkyl group and pharmaceutically acceptable salts thereof.