Patent ID: 7803831

Claim:
A compound of formula (IA) or (IB) or a salt or N-oxide thereof: wherein Ar is an aryl or heteroaryl radical which is linked via a ring carbon, and which is substituted by a hydroxy group on a carbon in the 2-position, and which is otherwise either unsubstituted or optionally substituted; R 1 is hydrogen or optionally substituted C 1 -C 6 alkyl; R 2 is hydrogen, optionally substituted cycloalkyl, cycloalkenyl, C 1 -C 6 alkyl, C 1 -C 6 alkenyl, or C 1 -C 6 alkynyl; or a carboxyl, carboxamide or carboxyl ester group; and; R 3 is a carboxamide group.