Patent ID: 8586746

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt or prodrug thereof, wherein X 1 is a bond or is selected from the group consisting of —O—, —O-alkylene, —NR 2 — and —NR 2 -alkylene, wherein the oxygen atom of —O-alkylene and the nitrogen atom of —NR 2 -alkylene is attached to the parent molecular moiety; A is —Ar 2 —Y—Ar 3 ; Ar 2 is selected from the group consisting of aryl and heteroaryl, wherein Ar 2 is unsubstituted or substituted with a substituent selected from alkyl, haloalkyl and nitro; Ar 3 is selected from the group consisting of aryl and heteroaryl, wherein Ar 3 is unsubstituted or substituted with a substituent selected from alkyl, haloalkyl and nitro; Y is a bond or —O—; and R 1 , R 2 and R 3 are individually selected from the group consisting of hydrogen and C 1 -C 6 alkyl.