To provide a compound having high molar absorptivity and useful as a dye.

The compound is expressed by formula (I) (wherein R1 is a hydrogen atom or a 1C-20C monovalent aliphatic hydrocarbon group and -CH2- contained in the aliphatic hydrocarbon group may be replaced with -O- or -CO-; R2 is a hydrogen atom, a cyano group or a carbamoyl group; R3 is a 1C-4C alkyl group and the hydrogen atom contained in the alkyl group may be replaced with a halogen atom; R4 to R8 are mutually independently a hydrogen atom, a 1C-8C alkyl group, a 1C-8C alkoxy group, a 2C-8C alkoxyalkyl group, a hydroxy group, a cyano group, a nitro group or -SO3M, at least one of R4 to R8 is a nitro group and at least one thereof is -SO3M, and M is a hydrogen atom or an alkali metal atom).