Patent ID: 8063098

Claim:
A compound of formula I wherein R 1 and R 2 are each independently lower alkyl, or together with the N-atom to which they are attached form a heterocyclic group selected from pyrrolidine, piperidine, piperazine, 4-methyl-piperazine, 4-cyclopropyl-piperazine, thiomorpholine, morpholine, 1-(3-oxa-8-aza-bicyclo[3.2.1]oct-8-yl and 1-(2-oxa-6-aza-spiro[3.3]hept-6-yl; X is a bond, —CH 2 — or —O—; Ar 1 is aryl or heteroaryl, each of which is unsubstituted or substituted by one or two substituents selected from halogen, lower alkyl, lower alkoxy, and lower alkyl substituted by halogen; Ar 2 is aryl or heteroaryl, each of which is unsubstituted or substituted by one, two or three substituents selected from halogen, lower alkyl, lower alkoxy, hydroxy, lower alkyl substituted by halogen, lower alkoxy substituted by halogen, S-lower alkyl, benzyl and phenyl; or a pharmaceutically acceptable acid addition salt, a racemic mixtures or their corresponding enantiomer and/or optical isomer thereof.