Patent ID: 8580147

Claim:
A compound represented by formula (1-1): wherein R 1 and R 2 are independently hydrogen, alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons or alkenyloxy having 2 to 9 carbons; the ring A 1 is trans-1,4-cyclohexylene, 1,4-cyclohexenylene, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl or pyridine-2,5-diyl; L 1 and L 2 are independently hydrogen or fluorine, and at least one of them is fluorine; and Z 1 , Z 2 and Z 3 are independently a single bond, —(CH 2 ) 2 —, —CH═CH—, —C≡C—, —CH 2 O—, —OCH 2 —, —COO— or —OCO—.