A compound of the formula, wherein n represents 1 or 2; X represents -N- or -N -; R 1 represents hydrogen or halogen; R 2 represents hydrogen or methyl; and R 3 represents • aryl-(C 1 -C 3)alkyl, which is in the alkyl part optionally mono-substituted with hydroxy or heterocyclyl; and which is in the aryl part mono-, di- or tri-substituted, wherein the substituents are independently selected from the group consisting of (C 1 -C 4)alkyl, (C 2 -C 4)alkenyl, (C 3 -C 6)cycloalkyl, (C 1 -C 4)alkoxy, hydroxy-(C 1 -C 3)alkyl, hydroxy-(C 2 -C 3)alkoxy, hydroxy-(C 2 -C 3)alkoxy-(C 1 -C 2)alkyl, (C 1 -C 2)alkoxy-(C 1 -C 2)alkyl, (C 1 -C 3)fluoroalkyl, (C 1 -C 3)fluoroalkoxy, cyano, halogen and phenoxy; or • heteroaryl-(C 1 -C 3)alkyl, which is in the alkyl part mono-substituted with heterocyclyl; and which is in the heteroaryl part mono-, di- or tri-substituted, wherein the substituents are independently selected from the group consisting of (C 1 -C 4)alkyl, (C 3 -C 6)cycloalkyl, (C 1 -C 4)alkoxy, (C 1 -C 3)fluoroalkyl and halogen; or • (C 3 -C 7)cycloalkyl, which is monosubstituted with -C NH 2 or an optionally mono-, di- or tri-substituted phenyl, wherein the substituents are selected from halogen; or • (C 5 -C 7)cycloalkyl, which is optionally mono-substituted with hydroxy or oxo; and which is annelated with an optionally mono-, di- or tri-substituted phenyl, wherein the substituents are selected from halogen; or • (C 3 -C 7)cycloalkyl-(C 1 -C 3)alkyl, which is in the alkyl part optionally mono-substituted with hydroxy; and which is in the cycloalkyl part optionally di-substituted with halogen and optionally mono-substituted with hydroxy, aryl or heteroaryl, wherein the aryl or heteroaryl groups are optionally mono-, di- or tri-substituted with halogen; or a salt of such a compound. n represents 1 or 2; X represents -N- or -N -; R 1 represents hydrogen or halogen; R 2 represents hydrogen or methyl; and R 3 represents • aryl-(C 1 -C 3)alkyl, which is in the alkyl part optionally mono-substituted with hydroxy or heterocyclyl; and which is in the aryl part mono-, di- or tri-substituted, wherein the substituents are independently selected from the group consisting of (C 1 -C 4)alkyl, (C 2 -C 4)alkenyl, (C 3 -C 6)cycloalkyl, (C 1 -C 4)alkoxy, hydroxy-(C 1 -C 3)alkyl, hydroxy-(C 2 -C 3)alkoxy, hydroxy-(C 2 -C 3)alkoxy-(C 1 -C 2)alkyl, (C 1 -C 2)alkoxy-(C 1 -C 2)alkyl, (C 1 -C 3)fluoroalkyl, (C 1 -C 3)fluoroalkoxy, cyano, halogen and phenoxy; or • heteroaryl-(C 1 -C 3)alkyl, which is in the alkyl part mono-substituted with heterocyclyl; and which is in the heteroaryl part mono-, di- or tri-substituted, wherein the substituents are independently selected from the group consisting of (C 1 -C 4)alkyl, (C 3 -C 6)cycloalkyl, (C 1 -C 4)alkoxy, (C 1 -C 3)fluoroalkyl and halogen; or • (C 3 -C 7)cycloalkyl, which is monosubstituted with -C NH 2 or an optionally mono-, di- or tri-substituted phenyl, wherein the substituents are selected from halogen; or • (C 5 -C 7)cycloalkyl, which is optionally mono-substituted with hydroxy or oxo; and which is annelated with an optionally mono-, di- or tri-substituted phenyl, wherein the substituents are selected from halogen; or • (C 3 -C 7)cycloalkyl-(C 1 -C 3)alkyl, which is in the alkyl part optionally mono-substituted with hydroxy; and which is in the cycloalkyl part optionally di-substituted with halogen and optionally mono-substituted with hydroxy, aryl or heteroaryl, wherein the aryl or heteroaryl groups are optionally mono-, di- or tri-substituted with halogen; • aryl-(C 1 -C 3)alkyl, which is in the alkyl part optionally mono-substituted with hydroxy or heterocyclyl; and which is in the aryl part mono-, di- or tri-substituted, wherein the substituents are independently selected from the group consisting of (C 1 -C 4)alkyl, (C 2 -C 4)alkenyl, (C 3 -C 6)cycloalkyl, (C 1 -C 4)alkoxy, hydroxy-(C 1 -C 3)alkyl, hydroxy-(C 2 -C 3)alkoxy, hydroxy-(C 2 -C 3)alkoxy-(C 1 -C 2)alkyl, (C 1 -C 2)alkoxy-(C 1 -C 2)alkyl, (C 1 -C 3)fluoroalkyl, (C 1 -C 3)fluoroalkoxy, cyano, halogen and phenoxy; or • heteroaryl-(C 1 -C 3)alkyl, which is in the alkyl part mono-substituted with heterocyclyl; and which is in the heteroaryl part mono-, di- or tri-substituted, wherein the substituents are independently selected from the group consisting of (C 1 -C 4)alkyl, (C 3 -C 6)cycloalkyl, (C 1 -C 4)alkoxy, (C 1 -C 3)fluoroalkyl and halogen; or • (C 3 -C 7)cycloalkyl, which is monosubstituted with -C NH 2 or an optionally mono-, di- or tri-substituted phenyl, wherein the substituents are selected from halogen; or • (C 5 -C 7)cycloalkyl, which is optionally mono-substituted with hydroxy or oxo; and which is annelated with an optionally mono-, di- or tri-substituted phenyl, wherein the substituents are selected from halogen; or • (C 3 -C 7)cycloalkyl-(C 1 -C 3)alkyl, which is in the alkyl part optionally mono-substituted with hydroxy; and which is in the cycloalkyl part optionally di-substituted with halogen and optionally mono-substituted with hydroxy, aryl or heteroaryl, wherein the aryl or heteroaryl groups are optionally mono-, di- or tri-substituted with halogen;