Patent ID: 7411004

Claim:
A compound of formula I wherein Ar 1 is selected from 4-chlorophenyl, 4-fluorophenyl, 4-trifluoromethylphenyl, 3,4-difluorophenyl, 3,4-dichlorophenyl and 4-methoxyphenyl; Ar 2 is selected from 2,5-dichlorophenyl, 2,5-difluorophenyl and 2-hydroxymethyl-5-fluorophenyl; R 1 represents H, or C 1-6 alkyl or C 2-6 alkenyl, any of which is optionally substituted by halogen, CN, NO 2 , CF 3 OH, C 1-4 alkoxy or C 1-4 alkoxycarbonyl; R 2 represents a saturated or unsaturated hydrocarbon linking group of up to 6 carbon atoms; X represents —O—, —S—, —SO 2 —, —N(R 4 )—, —C(O)—, —OC(O)—, —C(O)O—, —C(O)N(R 4 )—, —N(R 4 )C(O)—, —OC(O)O—, —N(R 4 )C(O)O—, —OC(O)N(R 4 )—, —SO 2 N(R 4 )— or —N(R 4 )SO 2 —; R 3 represents C 1-10 alkyl, C 2-6 alkenyl or C 2-6 alkynyl, any of which may be substituted by OR 4 ; R 4 represents H or C 1-4 alkyl m and n are each 0; or a pharmaceutically acceptable salt thereof.