Patent ID: 7503967

Claim:
An azo compound represented by Formula (1) as shown below or a salt thereof, wherein, each of R 1 , R 2 , R 5 , R 6 and R 7 independently represents a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group, a carboxyl group, a sulfo group, a sulfamoyl group, an N-alkylaminosulfonyl group, an N-phenylaminosulfonyl group, a (C1 to C4) alkylsulfonyl group which may be substituted by a hydroxyl group, a phospho group, a nitro group, an acyl group, a ureide group, a (C1 to C4) alkyl group which may be substituted by a hydroxyl group or a (C1 to C4) alkoxy group, a (C1 to C4) alkoxy group which may be substituted by a hydroxyl group, a (C1 to C4) alkoxy group, a sulfo group or a carboxyl group, an acylamino group, an alkylsulfonylamino group or a phenylsulfonylamino group which may be substituted by a halogen atom, an alkyl group or a nitro group, each of R 3 and R 4 independently represents a hydrogen atom, a halogen atom, a cyano group, a carboxyl group, a sulfo group, a nitro group, a (C1 to C4) alkyl group which may be substituted by a hydroxyl group or a (C1 to C4) alkoxy group, a (C1 to C4) alkoxy group which may be substituted by a hydroxyl group, a (C1 to C4) alkoxy group, a sulfo group or a carboxyl group, an acylamino group, an alkylsulfonylamino group or a phenylsulfonylamino group which may be substituted by a halogen atom, an alkyl group or a nitro group, and n represents 0 or 1, respectively.