Patent ID: 7740769

Claim:
A compound represented by Formula (1): wherein Ra and Rb each independently is hydrogen or linear alkyl having 1 to 20 carbon atoms; in the alkyl, arbitrary —CH 2 — may be replaced by —O—, or —CH═CH and arbitrary hydrogen may be replaced by fluorine; ring A 1 is 1,4-cyclohexylene, 1,4-phenylene, pyridine-2,5-diyl, pyridazine-3,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, 5,6,7,8-tetrahydronaphthalene-2,6-diyl, or naphthalene-2,6-diyl; arbitrary —CH 2 — constituting the rings may be replaced by —O—, and arbitrary hydrogen directly bonded to the rings may be replaced by fluorine, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 , or —OCH 2 F; Z 1 is a single bond or alkylene having 1 to 4 carbon atoms; in the alkylene, arbitrary —CH 2 — may be replaced by —O—, —CO—, —CH═CH—, —CF═CF—, or —C≡C—, and arbitrary hydrogen may be replaced by fluorine; Y 1 is hydrogen, fluorine, chlorine, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 , or —OCH 2 F; and m is 1, 2, or 3; and when m is 2 or 3, plural rings A 1 may be identical groups or different groups, and plural Z 1 may be identical groups or different groups.