Patent ID: 8268457

Claim:
A compound represented by one of the following general formulas (2) to (4): wherein R 1 and R 2 are a cyano group; and R 3 to R 8 are each selected from the group consisting of a hydrogen atom, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic rings, halogen atoms, a cyano group, a nitro group, ester groups, amide groups, alkoxy groups, substituted or unsubstituted phenoxy groups, and an amino group, and may be the same or different; those of R 3 to R 8 , which are adjacent to one another, may be linked together to form a ring structure, provided that at least one of R 3 to R 8 is selected from the group consisting of substituted alkyl groups, substituted aryl groups, substituted or unsubstituted heterocyclic rings, halogen atoms, a cyano group, a nitro group, ester groups, amide groups, substituted or unsubstituted phenoxy groups, and an amino group and at least one of R 3 to R 8 represents a fluorine-containing substituent; and X represents N or CH.