Patent ID: 7163827

Claim:
A compound represented by formula I: wherein Ar 1 and Ar 2 each independently represent a substituted phenylene group or a substituted napthylene group; R 1 represents a straight or branched chain alkyl group having 2 to 22 carbon atoms; R 2 represents a hydrogen atom or a group of the formula C(O)R 4 where R 4 is a hydrogen atom or a straight or branched chain alkyl group having 1 to 22 carbon atoms; and R 3 represents a hydrogen atom, a straight or branched chain alkyl group having 1 to 12 carbon atoms, a straight or branched chain alkoxy group having 1 to 12 carbon atoms, a hydroxyl group, or a substituted or unsubstituted phenyl group or a substituted or unsubstituted naphthyl group; and Z represents a hydrogen atom or a group of atoms that combine with Ar 2 or R 3 to form a lactone ring.