A compound of formula: wherein: - R 1 represents a group selected from: a) C 3 -C 6 cycloalkyl optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 6 alkyl and linear or branched C 1 -C 4 alkoxy, b) phenyl optionally substituted by a group selected from halogen atom and linear or branched C 1 -C 6 alkyl, c) C 4 -C 6 heterocyclic ring containing 1 or 2 heteroatoms selected from N, O and S and which is optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 6 alkyl and linear or branched C 1 -C 4 alkoxy, d) fluorine or bromine atom, e) cyano group, f) linear or branched C 1 -C 3 alkoxy optionally substituted by 1, 2 or 3 halogen atoms. g) linear or branched C 1 -C 6 alkyl optionally substituted by 1, 2 or 3 halogen atoms. h) -OH, - R 2 and R 6 independently represent a group selected from: a) halogen atom, b) linear or branched C 1 -C 6 alkyl, c) linear or branched C 1 -C 6 haloalkyl, d) C 3 -C 6 cycloalkyl optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 3 alkyl and linear or branched C 1 -C 2 alkoxy, - m and n are integers independently selected from 0 and 1, - R 3 represents a 5- to 10- membered, saturated, cycle optionally containing 1 or 2 heteroatoms selected from N and O, which is optionally substituted by 1, 2 or 3 groups selected from halogen atoms, linear or branched C 1 -C 6 alkyl, linear or branched C 1 -C 6 alkoxy, -OH and -NR 4 R 5, - R 4 and R 5 represent independently a group selected from hydrogen atom, C 3 -C 4 cycloalkyl group and linear or branched C 1 -C 3 alkyl, with the proviso that the compound of formula: - is excluded, and pharmaceutically acceptable salts thereof. - R 1 represents a group selected from: a) C 3 -C 6 cycloalkyl optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 6 alkyl and linear or branched C 1 -C 4 alkoxy, b) phenyl optionally substituted by a group selected from halogen atom and linear or branched C 1 -C 6 alkyl, c) C 4 -C 6 heterocyclic ring containing 1 or 2 heteroatoms selected from N, O and S and which is optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 6 alkyl and linear or branched C 1 -C 4 alkoxy, d) fluorine or bromine atom, e) cyano group, f) linear or branched C 1 -C 3 alkoxy optionally substituted by 1, 2 or 3 halogen atoms. g) linear or branched C 1 -C 6 alkyl optionally substituted by 1, 2 or 3 halogen atoms. h) -OH, a) C 3 -C 6 cycloalkyl optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 6 alkyl and linear or branched C 1 -C 4 alkoxy, b) phenyl optionally substituted by a group selected from halogen atom and linear or branched C 1 -C 6 alkyl, c) C 4 -C 6 heterocyclic ring containing 1 or 2 heteroatoms selected from N, O and S and which is optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 6 alkyl and linear or branched C 1 -C 4 alkoxy, d) fluorine or bromine atom, e) cyano group, f) linear or branched C 1 -C 3 alkoxy optionally substituted by 1, 2 or 3 halogen atoms. g) linear or branched C 1 -C 6 alkyl optionally substituted by 1, 2 or 3 halogen atoms. h) -OH, - R 2 and R 6 independently represent a group selected from: a) halogen atom, b) linear or branched C 1 -C 6 alkyl, c) linear or branched C 1 -C 6 haloalkyl, d) C 3 -C 6 cycloalkyl optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 3 alkyl and linear or branched C 1 -C 2 alkoxy, a) halogen atom, b) linear or branched C 1 -C 6 alkyl, c) linear or branched C 1 -C 6 haloalkyl, d) C 3 -C 6 cycloalkyl optionally substituted by a group selected from halogen atom, linear or branched C 1 -C 3 alkyl and linear or branched C 1 -C 2 alkoxy, - m and n are integers independently selected from 0 and 1, - R 3 represents a 5- to 10- membered, saturated, cycle optionally containing 1 or 2 heteroatoms selected from N and O, which is optionally substituted by 1, 2 or 3 groups selected from halogen atoms, linear or branched C 1 -C 6 alkyl, linear or branched C 1 -C 6 alkoxy, -OH and -NR 4 R 5, - R 4 and R 5 represent independently a group selected from hydrogen atom, C 3 -C 4 cycloalkyl group and linear or branched C 1 -C 3 alkyl, - is excluded,