Patent ID: 8507535

Claim:
A compound of formula I wherein A is selected from the groups (a), (b) or (c): or is cycloalkyl, optionally substituted by lower alkyl (c); Ar 1 is phenyl or a six membered heteroaryl; X 1 is N or CH; X 2 is N—R 1 or O; R 1 is S(O) 2 -lower alkyl, C(O)-cycloalkyl substituted by lower alkyl, or is C(O)-lower alkyl, lower alkyl, cyano, cycloalkyl or is a six membered heteroaryl substituted by lower alkyl, cyano, C(O)-lower alkyl, halogen, lower alkyl substituted by halogen or lower alkoxy; or is phenyl substituted by cyano or halogen; and R 2 is lower alkyl, halogen, pyrazolyl, 3-methyl-[1,2,4]oxazolyl, 5-methyl-[1,2,4]oxadiazol-3-yl, pyridyl substituted by cyano, or is phenyl substituted by halogen, or is cyano, lower alkoxy, or is piperidin-2-one; or pharmaceutically active salt, stereoisomer or a racemic or non-racemic mixture thereof.