Patent ID: 8163757

Claim:
A compound of formula (IA) or (1B) or a pharmaceutically or veterinarily acceptable salt thereof: wherein Ar represents an optionally substituted monocyclic or bicyclic aromatic or heteroaromatic group having from 5 to 10 ring atoms, R 1 and R 2 independently represent H, or C 1 -C 6 alkyl; R 3 represents H; F; Cl; Br; —NO 2 ; —CN; C 1 -C 6 alkyl optionally substituted by F or Cl; or C 1 -C 6 alkoxy optionally substituted by F; R 4 represents —C(═O)NR 6 R 7 , —NR 7 C(═O)R 6 , —NR 7 C(═O)OR 6 , —NHC(═O)NR 7 R 6 or —NHC(═S)NR 7 R 6 wherein R 6 a radical of formula -(Alk) m -Q wherein m is 0 or 1 Alk is an optionally substituted divalent straight or branched C 1 -C 12 alkylene, or C 2 -C 12 alkenylene, or C 2 -C 12 alkynylene radical or a divalent C 3 -C 12 carbocyclic radical, any of which radicals may be interrupted by one or more —O—, —S— or —N(R 8 )— radicals wherein R 8 represents H or C 1 -C 4 alkyl, C 3 -C 4 alkenyl, C 3 -C 4 alkynyl, or C 3 -C 6 cycloalkyl, and Q represents NR 9 R 2 wherein the R 9 substituents form a ring when taken together with the nitrogen to which they are attached; or heterocyclic group; and R 7 represents H or C 1 -C 6 alkyl; or when taken together with the atom or atoms to which they are attached R 6 and R 7 form a monocyclic heterocyclic ring having 5, 6 or 7 ring atoms; and X represents a bond or a divalent radical of formula —(Z) n -(Alk)- or -(Alk)-(Z) n — wherein Z represents —O—, —S— or —NH—, Alk is as defined in relation to R 6 and n is 0 or 1.