Patent ID: 8044219

Claim:
A compound of formula (1): wherein R 1 and R 2 are each independently a C 1-4 alkyl group or a C 6-14 monovalent aromatic hydrocarbon group; R 3 is a carboxylic acid group or carboxyl group; R 4 is a cyano group; R 5 is a hydrogen atom; X is a phenylene, naphthylene or anthrylene group which may have one or more substituents thereon; Y is a 2,5-thienylene group which may have one or more substituents thereon; and Z is a phenylene or thienylene group which may have one or more substituents thereon, or a structure of one of the following formulae: wherein the side of the structure bonding to Y in formula (1) is labeled as Y and (Fn) signifies that one or more fluorine atoms may be substituted thereon; m is an integer from 1 to 3; n is 0 or 1; and the double bonds in formula (1) may allow the formation of any cis-trans isomer configuration.