Patent ID: 8372527

Claim:
A compound shown by the following formula (III): wherein R 15 to R 24 , which may be the same or different, are a hydrogen atom, a halogen atom, a cyano group, an alkyl group, an aryl group, a fluoroalkyl group, an alkoxy group, an aryloxy group or a heterocyclic ring; adjacent groups of R 15 to R 24 may be bonded to form an aromatic ring or a heterocyclic ring, and the aromatic ring or the heterocyclic ring may have a substituent; and X is a single bond, —CO—, —S—, —SO—, —SO 2 — or —CR 25 R 26 wherein R 25 and R 26 are independently a hydrogen atom, a halogen atom, an alkyl group, an aryl group or a fluoroalkyl group, and R 25 and R 26 may be bonded to form a ring.