Patent ID: 7485644

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein ring B represents a monocyclic aryl ring having six ring atoms or a monocyclic heteroaryl ring having up to six ring atoms and containing one or more ring heteroatoms wherein each said heteroatom is nitrogen; R2 represents a group selected from C1-6 alkyl or aryl, which said group is substituted by one or more fluorine groups; n is 1, 2 or 3; and R 1 represents an optionally substituted group selected from C1-6 alkyl, C5-7 cycloalkyl, heterocycloalkyl, aryl, heteroaryl, C1-6 alkyl-aryl, C1-6alkyl-heteroaryl, C1-6 alkyl-cycloalkyl or C1-6alkyl-heterocycloalkyl.