Patent ID: 8906260

Claim:
A compound represented by formula (1): wherein, in formula (1), Ra and Rb are each independently fluorine, chlorine or alkyl having 1 to 10 carbons, and in the alkyl, at least one of —CH 2 — may be replaced by —O—, —S—, —CO— or —SiH 2 —, at least one of —(CH 2 ) 2 — may be replaced by —CH═CH— or —C≡C—, and at least one of hydrogen may be replaced by fluorine, however, Ra and Rb are not identical; A 1 , A 2 , A 3 , A 4 and A 5 are each independently 1,4-cyclohexylene, 1,4-phenylene, cyclohexene-1,4-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl or naphthalene-2,6-diyl, and in the groups, one of —CH 2 — may be replaced by —O—, —S—, —CO— or —SiH 2 —, at least one of —(CH 2 ) 2 — may be replaced by —CH═CH—, and at least one of hydrogen may be replaced by fluorine, chlorine, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 or —OCH 2 F; Z 1 , Z 2 , Z 4 and Z 5 are each independently a single bond or alkylene having 1 to 4 carbons, and in the alkylene, at least one of —CH 2 — may be replaced by —O—, —S—, —CO— or —SiH 2 —, at least one of —(CH 2 ) 2 — may be replaced by —CH═CH— or —C≡C—, and at least one of hydrogen may be replaced by fluorine; Y 1 , Y 2 , Y 3 and Y 4 are each independently hydrogen, fluorine, chlorine, —CF 3 or —CHF 2 ; and m, n, q and r are each independently 0, 1 or 2, and a sum of m, n, q and r is 0, 1, 2, 3 or 4.