Patent ID: 8167991

Claim:
A trisazo compound represented by the following formula (1) in free acid form: wherein, the group A is a substituted phenyl group and has a substituent selected from the group consisting of a carboxy group, a sulfo group, a chlorine atom, a cyano group, a nitro group, a sulfamoyl group, a C1 to C4 alkyl group, a C1 to C4 alkoxy group which may be substituted by a hydroxy group, a C1 to C4 alkoxy group, a sulfo group or a carboxy group and a C1 to C4 alkylsulfonyl group which may be substituted by a hydroxy group, a sulfo group or a carboxy group; B and C are substituted para-phenylene groups and have a substituent selected from the group consisting of a carboxy group, a sulfo group, a C1 to C4 alkyl group and a C1 to C4 alkoxy group which may be substituted by a hydroxy group, a C1 to C4 alkoxy group, a sulfo group or a carboxy group; R 1 represents a C1 to C4 alkyl group which may be substituted by a carboxy group, a phenyl group which may be substituted by a sulfo group, or a carboxy group; R 2 represents a cyano group, a carbamoyl group or a carboxy group; each of R 3 and R 4 independently represents a hydrogen atom, a methyl group, a chlorine atom or a sulfo group, respectively; or a salt thereof.