Patent ID: 7439407

Claim:
A compound represented by formula [2] (wherein X 1 , X 2 , X 3 , X 4 , X 8 , X 9 , X 10 , and X 11 represent fluorine, hydrogen, a substituted or unsubstituted C 1-8 alkyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted anthracenyl group, a substituted or unsubstituted naphthacenyl group, or a substituted or unsubstituted pentacenyl group, and may be the same or different; or X 2 is bonded to X 3 to form a monocyclic or condensed polycyclic hydrocarbon group and/or X 9 is bonded to X 10 form a monocyclic or condensed polycyclic hydrocarbon group).