Patent ID: 7261952

Claim:
A compound represented by the following formula (1): R 1 —CH═CH—X—CH═CH—R 2 wherein, X is R 1 , R 2 and R 3 each are independently formula (2), formula (3), or formula (4) or formula (5), with the proviso that R 1 and R 2 each are not formula (5) when x is 1,4-dicyanophenyl, and at least one of R 1 , R 2 and R 3 are not formula (5) when X is 1,3,5-tricyanophenyl, wherein, R 4 , R 5 , R 6 , R 7 , R 8 and R 9 each are independently a hydrogen atom, a halogen group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted allyl group.