Patent ID: 8685958

Claim:
A compound of formula I or a pharmaceutically acceptable salt thereof in which R 1 represents H, C 1-3 alkoxy optionally substituted by one or more fluoro or a C 1-3 alkyl group optionally substituted by one or more fluoro; R 2 and R 3 independently represent H, fluoro, chloro, bromo, a C 1-3 alkyl group optionally substituted by one or more fluoro, or a C 1-3 alkoxy group optionally substituted by one or more fluoro provided that R 2 and R 3 are not located meta to each other; A 1 represents a bond, CH 2 or CH 2 â€”CH 2 ; A 2 represents a bond, CH 2 , CH 2 â€”CH 2 or CH 2 â€”CH 2 â€”CH 2 ; provided that the total number of carbons in A 1 and A 2 together is 2 or 3; X represents a bond, CH 2 or O; and Y represents a bond, CH 2 or O; with the provisos that 1) one and only one of X and Y is always O and 2) when A 1 and A 2 each represent CH 2 then one of X and Y is CH 2 .