Patent ID: 8153785

Claim:
A compound of formula (I) wherein W is CH or N; R 1 is (C 1 -C 6 )alkyl; Y is O, CH 2 , S, NH, or NR 2 ; R 2 is (C 1 -C 6 )alkyl; X is CH 2 , O, NH, N((C 1 -C 6 )alkyl); Z is selected from wherein A is O, CH 2 , S, NH, or NR 2 ; R 3 is (C 1 -C 6 )alkyl; n is 1, 2, 3, 4 or 5; p is 0, 1, 2, 3, 4 or 5; Ar 1 and Ar 2 are each independently phenyl, optionally substituted by 1-3 groups selected from (C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, and halo; and the pharmaceutically acceptable salts thereof.