Patent ID: 8785463

Claim:
A compound of formula (I), its tautomeric form, its stereoisomer, and pharmaceutically acceptable salt thereof wherein R 1 represents H or an optionally substituted group selected from a member of the group consisting of linear or branched (C 1 -C 6 )-alkyl, haloalkyl, (C 1 -C 6 )alkenyl, cycloalkyl, cycloalkylalkyl, heterocyclyl, heterocyclylalkyl, aryl, aralkyl, heteroaryl, heteroarylalkyl, alkylsulfonyl, and arylsulfonyl groups, or a group represented by (CH 2 ) m CO 2 R 4 , (CH 2 ) m COR 4 or (CH 2 ) m CONH 2 wherein each R 4 independently represents H or a group selected from a member of the group consisting of linear or branched (C 1 -C 6 )alkyl, cycloalkyl, aryl, heterocyclyl and heteroaryl; and m is an integer of 0 to 3; R 2 represents H, cyano, nitro, formyl, linear or branched (C 1 -C 6 ) alkyl, or (C 1 -C 6 ) alkoxyl; R 3 represents an optionally substituted group selected from a member of the group consisting of linear or branched (C 1 -C 6 )alkyl, aryl, aralkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl, and heteroaralkyl or a group represented by C(O)OR 5 , C(O)R 5 , and SO 2 R 5 wherein each R 5 independently represents H or an optionally substituted group selected from a member of the group consisting of linear or branched (C 1 -C 6 )alkyl, aryl, aralkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl, hererocyclylalkyl, heteroaryl, and heteroaralkyl groups; n represents an integer from 0 to 3; and “A” represents wherein p represents an integer from 1 to 3; and X represents O or S.