Patent ID: 8420633

Claim:
A compound of the formula I wherein R 1 is selected from the group consisting of i) H, ii) —C 1-6 -alkyl, unsubstituted or substituted by 1 to 5 substituents individually selected from the group consisting of OH, halogen, cyano and C 1-6 -alkoxy, iii) —(CH 2 ) p —R 4 , wherein p is 0 or 1, R 4 is phenyl or 5- or 6-membered heteroaryl, each of which is unsubstituted or substituted by 1 to 5 substituents individually selected from the group consisting of OH, halogen, cyano, C 1-6 -alkoxy, halogen-C 1-6 -alkyl, halogen-C 1-6 -alkoxy and hydroxy-C 1-6 -alkyl, iv) —S(O) 2 —C 1-6 -alkyl, wherein the C 1-6 -alkyl is unsubstituted or substituted by 1 to 5 substituents individually selected from the group consisting of OH, halogen, cyano and C 1-6 -alkoxy, v) —C(O)—C 1-6 -alkyl, wherein the C 1-6 -alkyl is unsubstituted or substituted by 1 to 5 substituents individually selected from the group consisting of OH, halogen, cyano and C 1-6 -alkoxy, and vi) —C(O)O—C 1-6 -alkyl, wherein the C 1-6 -alkyl is unsubstituted or substituted by 1 to 5 substituents individually selected from the group consisting of OH, halogen, cyano and C 1-6 -alkoxy; R 2 is selected from the group consisting of hydrogen and halogen; and R 3 is aryl, unsubstituted or substituted by 1 to 5 substituents individually selected from the group consisting of OH, halogen, cyano, C 1-6 -alkyl, C 1-6 -alkoxy, halogen-C 1-6 -alkyl, halogen-C 1-6 -alkoxy and hydroxy-C 1-6 -alkyl; or a pharmaceutically acceptable salt thereof.