Patent ID: 7109336

Claim:
A compound represented by the following formula (I): 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 halogen atom or a cyano group; R 3 ′ represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an aryl group, a heterocyclic group, a carboxyl group or a sulfo group, wherein each group may have a substituent; 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, an acyl group, a carboxyl group, a sulfo group or a carbamoyl group, wherein each group may have a substituent, provided that at least one of R 4 ′ and R 5 ′ represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group and that at least one of R 6 ′ and R 7 ′ represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; 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.