A compound represented by the following formula (I-R1): wherein R 1 ' represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, a heterocyclic group or an acyl group, wherein each group may have a substituent; R 2 ' represents a hydrogen atom, a halogen atom or a cyano group; R 3 " represents an aryl group substituted with an electron-attracting group, a heterocyclic group or a heterocyclic group with an electron-attracting group, wherein the electron-attracting group has a Hammett's substituent constant σp value of 0.20 or greater; R 4 ', R 5 ', R 6 ', and R 7 ' each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an aryl group, a heterocyclic group, a sulfonyl group, including an alkylsulfonyl group and an arylsulfonyl group, an acyl group, a carboxyl group, a sulfo group or a carbamoyl group, wherein each of the alkyl group, the cycloalkyl group, the aralkyl group, the alkenyl group, the aryl group, the heterocyclic group, and the acyl group may have a substituent; provided that R 4 ' and R 5 ' do not simultaneously represent a hydrogen atom and that R 6 ' and R 7 ' do not simultaneously represent a hydrogen atom; and A 1 ' and A 2 ' each represent -CR= or a nitrogen atom provided that A 1 ' and A 2 ' do not simultaneously represent a nitrogen atom, wherein R represents a hydrogen atom or a substituent, wherein the substituent for the alkyl group is selected from a hydroxyl group, an alkoxy group, a cyano group, a halogen atom, and an ionic hydrophilic group, wherein the substituent for the cycloalkyl group is selected from ionic hydrophilic groups, wherein the substituent for the aralkyl group is selected from ionic hydrophilic groups, wherein the substituent for the aryl group is selected from an alkyl group, an alkoxy group, a halogen atom, an alkylamino group, an amido group, a carbamoyl group, a sulfamoyl group a sulfonamido group, a hydroxyl group, an ester group and an ionic hydrophilic group, wherein the substituent for the heterocyclic group is selected from an amido group, a carbamoyl group, a sulfamoyl group, a sulfonamido group, a hydroxyl group, an ester group, and an ionic hydrophilic group, and wherein the substituent for the acyl group and the alkenyl group is selected from ionic hydrophilic groups. wherein R 1 ' represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, a heterocyclic group or an acyl group, wherein each group may have a substituent; R 2 ' represents a hydrogen atom, a halogen atom or a cyano group; R 3 " represents an aryl group substituted with an electron-attracting group, a heterocyclic group or a heterocyclic group with an electron-attracting group, wherein the electron-attracting group has a Hammett's substituent constant σp value of 0.20 or greater; R 4 ', R 5 ', R 6 ', and R 7 ' each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an aryl group, a heterocyclic group, a sulfonyl group, including an alkylsulfonyl group and an arylsulfonyl group, an acyl group, a carboxyl group, a sulfo group or a carbamoyl group, wherein each of the alkyl group, the cycloalkyl group, the aralkyl group, the alkenyl group, the aryl group, the heterocyclic group, and the acyl group may have a substituent; provided that R 4 ' and R 5 ' do not simultaneously represent a hydrogen atom and that R 6 ' and R 7 ' do not simultaneously represent a hydrogen atom; and A 1 ' and A 2 ' each represent -CR= or a nitrogen atom provided that A 1 ' and A 2 ' do not simultaneously represent a nitrogen atom, wherein R represents a hydrogen atom or a substituent,