Patent ID: 7005431

Claim:
A compound of the formula I, or a pharmaceutically acceptable salt thereof: wherein: X 1 represents C 1-6 alkyl, trifluoromethyl, hydroxy or C 1-6 alkoxy, and X 2 represents hydrogen; or X 1 represents halogen, C 1-6 alkyl, trifluoromethyl, hydroxy or C 1-6 alkoxy, and X 2 represents 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, hydrocarbon, a heterocyclic group, halogen, cyano, trifluoromethyl, nitro, —OR a , —SR a , —SOR a , SO 2 R a , —SO 2 NR a R b , —NR a R b , —NR a COR b ,—NR a CO 2 R b , —COR a , COR 2 R a , —CONR a R b or CR a ═NOR b ; and R a and R b independently represent hydrogen, hydrocarbon or a heterocyclic group.