Substituted quinazolinones for treating neurological conditions

A compound of the formula

• or pharmaceutically acceptable salts, tautomers or stereoisomers thereof, in which
• R2 is CH2NR1R4 in which R1 and R4 are independently selected from H and C1-3 alkyl;
• R3 is optionally substituted C1-4 alkyl;
• R5 and R7 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.