A compound of formula I, wherein n is 2 or 3; R 1 is selected from the group consisting of i) H, ii) halogen, iii) C 1-6 -alkyl, and iv) halogen-C 1-6 -alkyl; R 2 is selected from the group consisting of i) H, ii) halogen, iii) C 1-6 -alkyl, and iv) halogen-C 1-6 -alkyl; R 3 is selected from the group consisting of i) aryl, ii) aryl substituted by 1-4 substituents individually selected from amino, cyano, halogen, halogen-C 1-6 -alkyl, halogen-C 1-6 -alkoxy, C 1-6 -alkoxy, C 1-6 -alkoxy-C 1-6 -alkyl, C 2-6 -alkynyl-C 1-6 -alkoxy, C 2-6 -alkynyl, C 1-6 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl that is optionally substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy, C 3-6 -cycloalkyl-C 1-6 -alkoxy and C 3-6 -cycloalkyl-C 1-6 -alkoxy, wherein the cycloalkyl unit is substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy; iii) heteroaryl, and iv) heteroaryl substituted by 1-4 substituents individually selected from amino, cyano, halogen, halogen-C 1-6 -alkyl, halogen-C 1-6 -alkoxy, C 1-6 -alkoxy, C 1-6 -alkoxy-C 1-6 -alkyl, C 2-6 -alkynyl-C 1-6 -alkoxy, C 2-6 -alkynyl, C 1-6 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl that is optionally substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy, C 3-6 -cycloalkyl-C 1-6 -alkoxy and C 3-6 -cycloalkyl-C 1-6 -alkoxy, wherein the cycloalkyl unit is substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy; or pharmaceutically acceptable salts thereof. n is 2 or 3; R 1 is selected from the group consisting of i) H, ii) halogen, iii) C 1-6 -alkyl, and iv) halogen-C 1-6 -alkyl; i) H, ii) halogen, iii) C 1-6 -alkyl, and iv) halogen-C 1-6 -alkyl; R 2 is selected from the group consisting of i) H, ii) halogen, iii) C 1-6 -alkyl, and iv) halogen-C 1-6 -alkyl; i) H, ii) halogen, iii) C 1-6 -alkyl, and iv) halogen-C 1-6 -alkyl; R 3 is selected from the group consisting of i) aryl, ii) aryl substituted by 1-4 substituents individually selected from amino, cyano, halogen, halogen-C 1-6 -alkyl, halogen-C 1-6 -alkoxy, C 1-6 -alkoxy, C 1-6 -alkoxy-C 1-6 -alkyl, C 2-6 -alkynyl-C 1-6 -alkoxy, C 2-6 -alkynyl, C 1-6 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl that is optionally substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy, C 3-6 -cycloalkyl-C 1-6 -alkoxy and C 3-6 -cycloalkyl-C 1-6 -alkoxy, wherein the cycloalkyl unit is substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy; iii) heteroaryl, and iv) heteroaryl substituted by 1-4 substituents individually selected from amino, cyano, halogen, halogen-C 1-6 -alkyl, halogen-C 1-6 -alkoxy, C 1-6 -alkoxy, C 1-6 -alkoxy-C 1-6 -alkyl, C 2-6 -alkynyl-C 1-6 -alkoxy, C 2-6 -alkynyl, C 1-6 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl that is optionally substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy, C 3-6 -cycloalkyl-C 1-6 -alkoxy and C 3-6 -cycloalkyl-C 1-6 -alkoxy, wherein the cycloalkyl unit is substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy; i) aryl, ii) aryl substituted by 1-4 substituents individually selected from amino, cyano, halogen, halogen-C 1-6 -alkyl, halogen-C 1-6 -alkoxy, C 1-6 -alkoxy, C 1-6 -alkoxy-C 1-6 -alkyl, C 2-6 -alkynyl-C 1-6 -alkoxy, C 2-6 -alkynyl, C 1-6 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl that is optionally substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy, C 3-6 -cycloalkyl-C 1-6 -alkoxy and C 3-6 -cycloalkyl-C 1-6 -alkoxy, wherein the cycloalkyl unit is substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy; iii) heteroaryl, and iv) heteroaryl substituted by 1-4 substituents individually selected from amino, cyano, halogen, halogen-C 1-6 -alkyl, halogen-C 1-6 -alkoxy, C 1-6 -alkoxy, C 1-6 -alkoxy-C 1-6 -alkyl, C 2-6 -alkynyl-C 1-6 -alkoxy, C 2-6 -alkynyl, C 1-6 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl that is optionally substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy, C 3-6 -cycloalkyl-C 1-6 -alkoxy and C 3-6 -cycloalkyl-C 1-6 -alkoxy, wherein the cycloalkyl unit is substituted by 1 to 4 substituents individually selected from the group consisting of halogen, cyano, C 1-6 -alkyl and C 1-6 -alkoxy;