Patent ID: 8324254

Claim:
A compound of formula (I) or salts thereof: wherein one of R 5 and R 6 is hydrogen and the other is (a): one of R 3 and R 4 is (b): A is a phenyl or a 5 or 6-membered heteroaryl ring; R 1 is hydrogen or up to three substituents independently selected from halogen, C (1-4) alkyl, C (1-4) alkoxy, C (5-7) cycloalkyl, C (5-7) cycloalkoxy, trifluoromethoxy, difluoromethoxy, trifluoromethyl, cyano, phenyl, 5 or 6 membered heteroaryl rings, piperidinyl and pyrrolidinyl; R 2 is hydrogen or up to three substituents independently selected from halogen, C (1-4) alkyl, C (1-4) alkoxy, trifluoromethoxy, difluoromethoxy, trifluoromethyl and cyano; R 7 is hydrogen or halogen; Z is C (1-4) alkyl may be optionally interrupted once by N or O and may be optionally substituted on carbon by up to four substituents independently selected from halogen, methyl and hydroxyl, with the proviso that no carbon atom is substituted by two hydroxyl groups.