Patent ID: 7612201

Claim:
A compound of formula (IA) or (IB) or a salt, or N-oxide thereof: wherein Ar is a 2,4-dihydroxyphenyl group which is optionally further substituted in the 5-position, R 1 and R 2 are independently hydrogen, methyl, ethyl, n- or iso-propyl, hydroxyethyl, or benzyl; ring A is a ring of formula (IIA) wherein X represents N, and Y represents CH, O, S or NH, wherein (i) a ring carbon is optionally substituted, and/or (ii) a ring nitrogen is optionally substituted by a group of formula -(Alk 1 ) p -(Cyc) n -(Alk 3 ) m -(Z) r -(Alk 2 ) s -Q where Alk 1 , Alk 2 and Alk 3 are optionally substituted C 1 -C 3 alkyl, Cyc is an optionally substituted phenylene radical; m, n, p, r and s are independently 0 or 1, Z is —O—, —S—, —(C═O)—, —SO 2 —, —C(═O)O—, —OC(═O)—, —NR A —, —C(═O)NR A —, —NR A C(═O)—, —SO 2 NR A —, or —NR A SO 2 — wherein R A is hydrogen or C 1 -C 6 alkyl, and Q is an optionally substituted phenyl, pyridyl, furyl, thienyl, oxadiazolyl, imidazolyl, or morpholinyl wherein “optionally substituted” means substituted with up to four substituents, each of which is independently selected from (C 1 -C 6 )alkyl, (C 1 -C 6 )alkoxy, hydroxy, hydroxy(C 1 -C 6 )alkyl, mercapto, mercapto(C 1 -C 6 )alkyl, (C 1 -C 6 )alkylthio, halo, trifluoromethyl, trifluoromethoxy, nitro, nitrile, oxo, phenyl, —COOH, —COOR A , —COR A , —SO 2 R A , —CONH 2 , —CONHNH 2 ; —CONHNHR A , —CONHNR A R B , —SO 2 NH 2 , —CONHR A , SO 2 NHR A , —CONR A R B , —SO 2 NR A R B , —NH 2 , —NHR A , —NR A R B , —OCONH 2 , —OCONHR A , —OCONR A R B , —NHCOR A , —NHCOOR A , —NR B COOR A , —NHSO 2 OR A , —NR B SO 2 OR A , —NHCONH 2 , —NR A CONH 2 , —NHCONHR B , —NR A CONHR B , —NHCONR A R B , and —NR A CONR A R B wherein R A and R B are independently a (C 1 -C 6 )alkyl group.