Patent ID: 7501541

Claim:
A compound of formula I wherein Ar 1 and Ar 2 are each independently unsubstituted or substituted aryl or heteroaryl; R 1 and R 2 are each independently hydrogen, lower alkyl, lower alkyl substituted by halogen, —(CH 2 ) o —O-lower alkyl, —(CH 2 ) o —N-(lower alkyl) 2 , (CH 2 ) p -cycloalkyl, (CH 2 ) p -heterocycloalkyl, (CH 2 ) p -aryl, or (CH 2 ) p -heteroaryl, wherein cycloalkyl, heterocycloalkyl, aryl, and heteroaryl are optionally substituted by R, or R 1 and R 2 together with the N-atom to which they are attached form a heterocyclic ring, optionally containing further ring-heteroatoms selected from N, O and S, which ring is optionally substituted by R; R is halogen, lower alkyl, lower alkyl substituted by halogen, lower alkoxy or lower alkoxy substituted by halogen; R 3 is hydrogen or lower alkyl; n is 0, 1, 2, 3 or 4; o is 1, 2 or 3; and p is 0, 1 or 2; or a pharmaceutically suitable acid addition salt, optically pure enantiomer, racemate or diastereomeric mixture thereof.