Patent ID: 6914065

Claim:
A compound of formula I, or a salt thereof: wherein: X represents hydrogen or halogen; Y represents a chemical bond, an oxygen atom, or a —NH— linkage; Z represents an aryl or heteroaryl group, which is unsubstituted or substituted with a substituent selected from halogen, cyano, nitro, amino, formyl, C 2-6 alkoxycarbonyl, —CR a ═NOR b , trifluoromethyl, C 1-6 alkoxy and —CONR a R b ; 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 , —CO 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.