Patent ID: 8476473

Claim:
A compounds represented by the Formula (I) or the Formula (I′), wherein Z 1 and Z 2 independently represent a hydrogen atom, a C 1 to C 12 alkyl group or a C 3 to C 12 cyclic saturated hydrocarbon group, provided that at least one of Z 1 and Z 2 represent a C 1 to C 12 alkyl group or a C 3 to C 12 cyclic saturated hydrocarbon group; rings Y 1 and Y 2 independently represents an optionally substituted C 3 to C 20 alicyclic hydrocarbon group; and Q 1 to Q 4 independently represent a fluorine atom or a C 1 to C 6 perfluoroalkyl group; wherein Q′ 1 to Q′ 4 independently represent a fluorine atom or a C 1 to C 6 perfluoroalkyl group; and m and n independently represent an integer of 0 to 5.