Patent ID: 8586581

Claim:
A compound of formula I wherein X is N or C—R 1 ; Y is N or C—R 2 ; Z is N; R 4 is a 6-membered aromatic substituent containing 0, 1 or 2 nitrogen atoms, optionally substituted by 1 to 3 groups, selected from halogen, lower alkyl, lower alkoxy and NRR′; R 1 is lower alkyl, lower alkoxy, hydroxy, lower hydroxyalkyl, lower cycloalkyl or heterocycloalkyl optionally substituted with hydroxy or alkoxy; R 2 is hydrogen, CN, lower alkyl or heterocycloalkyl; and R and R′ are each independently hydrogen or lower alkyl; or a pharmaceutically acceptable salt or acid addition salt, a racemic mixture, an enantiomers, optical isomer or stereoisomer thereof.