Patent ID: 6936608

Claim:
A compound of formula I, or a pharmaceutically acceptable salt thereof: wherein: X 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, C 2-6 alkenyl, C 2-6 alkynyl, C 3-7 cycloalkyl, C 3-7 cycloalkyl(C 1-6 alkyl), indanyl, phenyl, phenyl(C 1-6 alkyl), 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 , —CO 2 R a , —CONR a R b or —CR a ═NOR b ; and R a and R b independently represent hydrogen, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-7 cycloalkyl, C 3-7 cycloalkyl(C 1-6 alkyl), indanyl, phenyl, phenyl(C 1-6 alkyl), or a heterocyclic group.