Patent ID: 8188102

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: wherein, A is R 4 , R 5 , R 6 and R 7 being each independently hydrogen, halogen, N—C 1-6 alkyl or N-hydroxy amido or C—C 1-6 alkyl reverse amido(—NHCOC 1-6 ), hydroxycarbonyl (—COOH), C 1-6 alkyloxycarbonyl (—COOC 1-6 ), C 1-6 alkyl, or C 1-6 alkyl substituted with a hydroxy, C 1-6 dialkylamine or 5- or 6-membered heterocyclic group having at least one selected from the group consisting of N, O and S, wherein the 5- or 6-membered heterocyclic group is unsubstituted or substituted with C 1-4 alkyl; R 1 is a C 6-10 aryl or 5 to 10-membered heterocyclic group having at least one selected from the group consisting of N, O and S substituted with one to five X, or C 1-6 alkyl substituted with phenyl; R 2 is hydrogen, hydroxy, C 1-6 alkoxy, or C 1-6 alkoxy substituted with C 1-6 alkoxy or 5- or 6-membered heterocyclic group having at least one selected from the group consisting of N, O and S; R 3 is hydrogen, —COOH, C 1-6 alkyloxycarbonyl, or amido N-unsubstituted or N-substituted with Y; n a and n b are each an integer ranging from 0 to 6, with the proviso that n a and n b are not simultaneously 0; and when n a is 0, said and when n b is 0, said in which: X is hydrogen, halogen, hydroxy, cyano, nitro, (mono-, di-, or trihalogeno)methyl, mercapto, C 1-6 alkylthio, acrylamido, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 alkoxy, phenyloxy, C 1-6 dialkylamino, or C 1-6 alkyl or C 1-6 alkoxy substituted with Z; Y is hydroxy or C 1-6 alkyl or C 1-6 alkyl substituted with Z; and Z is hydroxy, C 1-3 alkoxy, C 1-3 alkylthio, C 1-3 alkylsulfonyl, di-C 1-3 alkylamine, C 1-6 alkyl, phenyl or 5- or 6-membered aromatic or non-aromatic heterocyclic group, said heterocyclic group containing one to four of the moiety selected from the group consisting of N, O, S, SO, and SO 2 and said aryl and heterocyclic group being unsubstituted, or substituted with substituents selected from the group consisting of halogen, hydroxyl, amino, nitro, cyano, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 alkoxy, C 1-6 monoalkylamino and C 1-6 dialkylamino.