Patent ID: 7452615

Claim:
A compound of Formula 1: wherein, X 1 to X 3 each are a substituted or unsubstituted benzene ring, or a substituted or unsubstituted 5-membered heterocylic aromatic group which includes a ring member selected from the group consisting of O, S, and NR′ (R′ is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted aromatic group); R 1 to R 3 are each a substituted or unsubstituted aromatic group or a substituted or unsubstituted heterocyclic aromatic group with a proviso that X 1 to X 3 be a substituted or unsubstituted benzene ring; and R 1 to R 3 each are selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aromatic group, and a substituted or unsubstituted heterocyclic aromatic group with a proviso that X 1 to X 3 be a substituted or unsubstituted 5-membered heterocyclic aromatic group.