Patent ID: 8501778

Claim:
A compound represented by the following formula, or a salt thereof: wherein: A represents: OH, F, Cl, Br, or a (C 1 -C 4 )alkoxy, wherein the alkyl moiety of the (C 1 -C 4 )alkoxy is substituted optionally by 1-3 fluorine atom(s) and further substituted optionally by amino group or hydroxy substituent; when B is connected with an adjacent carbon through a single bond, B represents OH; when B is connected with an adjacent carbon through a double bond, B represents O or S; R 1 and R 2 each independently represent one selected from the group consisting of hydrogen, a C 1 -C 4 alkyl, a C 5 or C 6 aliphatic ring, phenyl, substituted phenyl, hydroxy, (C 1 -C 4 )alkoxy, amino, substituted amino, halogen, carboxyl, carboxylic ester, nitro and acetonitrile, wherein the alkyl moiety in the C 1 -C 4 alkyl, (C 1 -C 4 )alkoxy and C 5 or C 6 aliphatic ring is substituted optionally by 1-3 fluorine atom(s) and further substituted optionally by amino group or hydroxy group; R 3 , R 4 and R 5 each independently represent one selected from the group consisting of hydrogen, C 1 -C 4 alkyl, a C 5 or C 6 aliphatic ring, morpholino, pyrrolidinyl, piperidinyl, phenyl, substituted phenyl, hydroxy, (C 1 -C 4 )alkoxy, amino, substituted amino, halogen, carboxyl, carboxylic ester, nitro, and acetonitrile, wherein the alkyl moiety in the C 1 -C 4 alkyl, (C 1 -C 4 )alkoxy and C 5 or C 6 aliphatic ring is substituted optionally by 1-3 fluorine atom(s) and further substituted optionally by amino group or hydroxy group; R 6 , R 7 and R 8 each independently represent one selected from the group consisting of hydrogen, C 1 -C 4 alkyl, a C 5 or C 6 aliphatic ring, morpholino, pyrrolidinyl, piperidinyl, phenyl, substituted phenyl, hydroxy, (C 1 -C 4 )alkoxy, halogen, carboxyl, carboxylic ester, nitro, and acetonitrile, wherein the alkyl moiety in the C 1 -C 4 alkyl, (C 1 -C 4 )alkoxy and C 5 or C 6 aliphatic ring is substituted optionally by 1-3 fluorine atom(s) and further substituted optionally by amino group or hydroxy group; n=0 or 1; m=1.