Patent ID: 8084459

Claim:
A compound of the formula or pharmaceutically acceptable salts, tautomers or stereoisomers thereof, in which R 2 is CH 2 NR 1 R 4 in which R 1 and R 4 are independently selected from H and C 1-3 alkyl; R 3 is optionally substituted C 1-4 alkyl; R 5 and R 7 are chloro; and X is O wherein the optional substituents are independently selected from alkyl, alkenyl, alkynyl, aryl, formyl, halo, haloalkyl, haloalkenyl, haloalkynyl, haloaryl, hydroxy, alkoxy, alkenyloxy, aryloxy, benzyloxy, haloalkoxy, haloalkenyloxy, haloaryloxy, nitro, nitroalkyl, nitroalkenyl, nitroalkynyl, nitroaryl, nitroheterocyclyl, amino, alkylamino, dialkylamino, alkenylamino, alkynylamino, arylamino, diarylamino, benzylamino, dibenzylamino, acyl, alkenylacyl, alkynylacyl, arylacyl, acylamino, diacylamino, acyloxy, alkylsulphonyloxy, arylsulphenyloxy, heterocyclyl, heterocyclyloxy, heterocyclylamino, haloheterocyclyl, alkylsulphenyl, arylsulphenyl, carboalkoxy, carboaryloxy, mercapto, alkylthio, benzylthio and acylthio.