A compound of formula: wherein: - R 2 is selected from Cl and F atoms, - R 1 represents a cyano group, - G 1 and G 2 independently represent a group selected from N atom and -CR 9, wherein G 1 and G 2 are not simultaneously CR 9, - R 9 is independently selected from the group consisting of: a) five or a six-membered heteroaryl ring optionally substituted by one or more substituents selected from the group consisting of halogen atom, cyano group, - COOH group, linear or branched C 1 -C 3 alkyl group, linear or branched C 1 -C 3 alkoxy, linear or branched C 1 -C 3 haloalkyl group, C 3 -C 4 cycloalkyl, and C 3 -C 4 cycloalkoxy, b) phenyl group optionally substituted by one or more substituents selected from the group consisting of halogen atom, cyano group, -COOH group, linear or branched C1-C3 alkyl group, linear or branched C1-C3 alkoxy, linear or branched C1-C3 haloalkyl group, C3-C4 cycloalkyl, C3-C4 cycloalkoxy, c) a five or six-membered saturated heterocyclic ring comprising one or two heteroatoms selected from N and O as part of the cycle, which heterocycle is optionally substituted by a group selected from C 1 -C 3 alkyl group, and C 3 -C 4 cycloalkyl group, and d) -C 3 -C 6 cycloalkyl group. - R 3, R 4 and R 5 are independently selected from the group consisting of hydrogen atom, halogen atom, linear or branched C 1 -C 3 alkyl group, C 3 -C 4 cycloalkyl group and cyano group, and pharmaceutically acceptable salts thereof. - R 2 is selected from Cl and F atoms, - R 1 represents a cyano group, - G 1 and G 2 independently represent a group selected from N atom and -CR 9, wherein G 1 and G 2 are not simultaneously CR 9, - R 9 is independently selected from the group consisting of: a) five or a six-membered heteroaryl ring optionally substituted by one or more substituents selected from the group consisting of halogen atom, cyano group, - COOH group, linear or branched C 1 -C 3 alkyl group, linear or branched C 1 -C 3 alkoxy, linear or branched C 1 -C 3 haloalkyl group, C 3 -C 4 cycloalkyl, and C 3 -C 4 cycloalkoxy, b) phenyl group optionally substituted by one or more substituents selected from the group consisting of halogen atom, cyano group, -COOH group, linear or branched C1-C3 alkyl group, linear or branched C1-C3 alkoxy, linear or branched C1-C3 haloalkyl group, C3-C4 cycloalkyl, C3-C4 cycloalkoxy, c) a five or six-membered saturated heterocyclic ring comprising one or two heteroatoms selected from N and O as part of the cycle, which heterocycle is optionally substituted by a group selected from C 1 -C 3 alkyl group, and C 3 -C 4 cycloalkyl group, and d) -C 3 -C 6 cycloalkyl group. a) five or a six-membered heteroaryl ring optionally substituted by one or more substituents selected from the group consisting of halogen atom, cyano group, - COOH group, linear or branched C 1 -C 3 alkyl group, linear or branched C 1 -C 3 alkoxy, linear or branched C 1 -C 3 haloalkyl group, C 3 -C 4 cycloalkyl, and C 3 -C 4 cycloalkoxy, b) phenyl group optionally substituted by one or more substituents selected from the group consisting of halogen atom, cyano group, -COOH group, linear or branched C1-C3 alkyl group, linear or branched C1-C3 alkoxy, linear or branched C1-C3 haloalkyl group, C3-C4 cycloalkyl, C3-C4 cycloalkoxy, c) a five or six-membered saturated heterocyclic ring comprising one or two heteroatoms selected from N and O as part of the cycle, which heterocycle is optionally substituted by a group selected from C 1 -C 3 alkyl group, and C 3 -C 4 cycloalkyl group, and d) -C 3 -C 6 cycloalkyl group. - R 3, R 4 and R 5 are independently selected from the group consisting of hydrogen atom, halogen atom, linear or branched C 1 -C 3 alkyl group, C 3 -C 4 cycloalkyl group and cyano group,