A compound of formula wherein R is selected from the group consisting of -R a, -COR a, -CONR a R b and -SO 2 R a, and R1 is a group -NR c R d, wherein R a, R b, R c and R d, the same or different, are each independently hydrogen or a group selected from straight or branched C 1 -C 6 alkyl, C 3 -C 6 cycloalkyl, cycloalkyl C 1 -C 6 alkyl, aryl, aryl C 1 -C 6 alkyl and heteroaryl, optionally substituted by one or more groups selected from halogen, cyano, C 1 -C 6 alkyl, polyfluorinated alkyl, cycloalkyl, heterocyclyl, aryl, dialkylamino and alkoxy, wherein: the term "C 3 -C 6 cycloalkyl" represents a 3- to 6-membered all-carbon monocyclic ring, which may contain one or more double bonds but does not have a completely conjugated π-electron system; the term "heterocyclyl" represents a 3- to 7-membered, saturated or partially unsaturated carbocyclic ring where one or more carbon atoms are replaced by heteroatoms selected from nitrogen and oxygen; the term "aryl" represents a mono-, bi- or poly-carbocyclic hydrocarbon with from 1 to 4 ring systems, optionally further fused or linked to each other by single bonds, wherein at least one of the carbocyclic rings is "aromatic", wherein the term "aromatic" refers to completely conjugated π-electron bond system; the term "heteroaryl" represents aromatic heterocyclic rings, typically 5- to 7-membered heterocycles with from 1 to 3 heteroatoms selected among N or S; the heteroaryl ring can be optionally further fused or linked to aromatic and non-aromatic carbocyclic and heterocyclic rings; and pharmaceutically acceptable salts thereof. R is selected from the group consisting of -R a, -COR a, -CONR a R b and -SO 2 R a, and R1 is a group -NR c R d, wherein R a, R b, R c and R d, the same or different, are each independently hydrogen or a group selected from straight or branched C 1 -C 6 alkyl, C 3 -C 6 cycloalkyl, cycloalkyl C 1 -C 6 alkyl, aryl, aryl C 1 -C 6 alkyl and heteroaryl, optionally substituted by one or more groups selected from halogen, cyano, C 1 -C 6 alkyl, polyfluorinated alkyl, cycloalkyl, heterocyclyl, aryl, dialkylamino and alkoxy, wherein: the term "C 3 -C 6 cycloalkyl" represents a 3- to 6-membered all-carbon monocyclic ring, which may contain one or more double bonds but does not have a completely conjugated π-electron system; the term "heterocyclyl" represents a 3- to 7-membered, saturated or partially unsaturated carbocyclic ring where one or more carbon atoms are replaced by heteroatoms selected from nitrogen and oxygen; the term "aryl" represents a mono-, bi- or poly-carbocyclic hydrocarbon with from 1 to 4 ring systems, optionally further fused or linked to each other by single bonds, wherein at least one of the carbocyclic rings is "aromatic", wherein the term "aromatic" refers to completely conjugated π-electron bond system; the term "heteroaryl" represents aromatic heterocyclic rings, typically 5- to 7-membered heterocycles with from 1 to 3 heteroatoms selected among N or S; the heteroaryl ring can be optionally further fused or linked to aromatic and non-aromatic carbocyclic and heterocyclic rings; and pharmaceutically acceptable salts thereof. the term "C 3 -C 6 cycloalkyl" represents a 3- to 6-membered all-carbon monocyclic ring, which may contain one or more double bonds but does not have a completely conjugated π-electron system; the term "heterocyclyl" represents a 3- to 7-membered, saturated or partially unsaturated carbocyclic ring where one or more carbon atoms are replaced by heteroatoms selected from nitrogen and oxygen; the term "aryl" represents a mono-, bi- or poly-carbocyclic hydrocarbon with from 1 to 4 ring systems, optionally further fused or linked to each other by single bonds, wherein at least one of the carbocyclic rings is "aromatic", wherein the term "aromatic" refers to completely conjugated π-electron bond system; the term "heteroaryl" represents aromatic heterocyclic rings, typically 5- to 7-membered heterocycles with from 1 to 3 heteroatoms selected among N or S; the heteroaryl ring can be optionally further fused or linked to aromatic and non-aromatic carbocyclic and heterocyclic rings; and pharmaceutically acceptable salts thereof.