| abstract |
Compounds of formula (I):n or a pharmaceutically acceptable salt thereof, wherein m is 0 to 3; n is 1 to 5; R 1 is hydrogen, or C 1-6 alkyl; R 2 is hydrogen, C 1-4 alkyl, -(CH 2 )p-NH 2 wherein p is 1 to 4, or -NHCOR, wherein R 5 is C 1-4 alkyl; R 3 is hydrogen or C 1 - 6 alkyl; R 4 is C 1 - 4 alkyl, C 1-4 alkoxy, halogen or CF 3 ; and X is CH 2 or S. n Having useful pharmacological activity, compositions containing them, and a process for their preparation. |