Patent ID: 7148222

Claim:
A compound of the formula I, or a pharmaceutically acceptable salt thereof: wherein: X 1 represents hydrogen, halogen, C 1-6 alkyl, trifluoromethyl or C 1-6 alkoxy; X 2 represents hydrogen or halogen; Y represents a chemical bond, an oxygen atom, or a —NH— linkage; Z represents an optionally substituted aryl or heteroaryl group; R 1 represents hydrogen, C 1-6 alkyl, halo(C 1-6 )alkyl, dihalo(C 1-6 )alkyl, hydroxy(C 1-6 )alkyl, dihydroxy(C 1-6 )alkyl, C 1-6 alkoxy(C 1-6 )alkyl, di(C 1-6 )alkoxy(C 1-6 )alkyl, cyano(C 1-6 )alkyl, C 2-6 alkoxycarbonyl(C 1-6 )alkyl, C 3-7 cycloalkyl, heteroaryl, C 1-6 alkyl-heteroaryl, heteroaryl(C 1-6 )alkyl, halogen, cyano, trifluoromethyl, formyl, C 2-6 alkylcarbonyl, C 2-6 alkoxycarbonyl or —CR a ═NOR b ; R a and R b independently represent hydrogen, or a heterocyclic group.