Patent ID: 7365069

Claim:
A pyrimidone of the formula (I) or its pharmaceutically acceptable salt, wherein X represents oxygen, sulfur or NR, wherein R represents hydrogen, hydroxyl, acyl, alkyl, alkoxy, aryl, amino, hydroxylamino, alkylamino, arylamino, acylamino, alkoxyamino group; the rings represented by A and B are selected from aryl or heteroaryl; R 1 and R 3 may be same or different and independently represent hydrogen, SR 7 , S(O) p R 8 ; R 2 and R 4 may be same or different and independently represent halogen, hydroxyl, nitro, cyano, azido, nitroso, amino, formyl, alkyl, haloalkyl, acyl, alkoxy, monoalkylamino, dialkylamino, acylamino, alkoxycarbonyl, SR 7 , S(O) p R 8 , alkoxyalkyl groups or carboxylic acids; R 5 and R 6 may be same or different and independently represent halogen, hydroxyl, nitro, cyano, azido, nitroso, amino, formyl, aralkyl, haloalkyl, acyl, alkoxy, aryloxy, aralkoxy, heteroaryl, heterocyclyl, monoalkylamino, dialkylamino, acylamino, alkoxycarbonyl, SR 7 , S(O) p R 8 , alkoxyalkyl groups or COR 9 ; R 7 represents hydrogen, alkyl or aryl; R 8 represents halogen, alkyl, amino, acylamino, arylamino or aryl group; R 9 represents hydrogen, hydroxyl, amino, halogen, alkyl, alkoxy, aryloxy, monoalkylamino, dialkylamino, acylamino, arylamino, groups; m is an integer and is in the range of 1 to 4; n is an integer and is in the range of 1 to 4; p represents an integer of 1 or 2.