| abstract |
ABSTRACT Compounds of formula (I): (I) or a pharmaceutically acceptable salt thereof, wherein m is 0 to 3; n is 1 to 5; R1 is hydrogen, or C1-6 alkyl; R2 is hydrogen, C1-4alkyl, -(CH2)p-NH2 wherein p is 1 to 4, or -NHCOR,wherein R5 is C1-4 alkyl; R3 is hydrogen or C1-6 alkyl; R4 is C1-4alkyl, C1-4 alkoxy, halogen or CF3; and X is CH2 or S. having useful pharmacological activity, compositions containing them, and a process for their preparation. |