Patent ID: 7709505

Claim:
A compound of formula (I) or a salt thereof, wherein: Ring A is pyridin-2-yl wherein said pyridin-2-yl is optionally substituted on carbon by one or more groups selected from R 4 ; one of R 1 and R 2 is hydrogen and the other is hydrogen or C 1-4 alkyl; wherein R 1 and R 2 are optionally substituted on carbon by one or more groups selected from R 5 ; R 3 is selected from C 1-4 alkyl, C 1-4 alkoxy, carbocyclyl, and carbocyclyloxy; wherein R 3 is optionally substituted on carbon by one or more groups selected from R 6 ; R 4 is selected from halo, carboxy and C 1-4 alkyl; R 5 and R 6 are independently selected from halo, C 1-4 alkyl, C 1-4 alkoxy, N—(C 1-4 alkyl)amino, N,N—(C 1-4 alkyl) 2 -amino, carbocyclyl, carbocyclyloxy, and carbocyclylidenyl; wherein R 5 and R 6 are independently optionally substituted on carbon by one or more R 7 ; R 7 is selected from halo, carboxy, methyl, ethyl, methoxy, ethoxy, methylamino, ethylamino, dimethylamino, diethylamino and N-methyl-N-ethylamino.