| abstract |
A compound represented by the following general formula (I). n n n n n n n n n n (In the formula, R 1 is hydrogen or C 1-8 alkyl; ring A is 1,4-phenylene, 1,4-trans-cyclohexylene, or 2,6-naphthylene; Z 1 and Z 2 each are —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CH 2 CH 2 —, —CH|CH—, —C≡C—, or a single bond; m is 1 or 2; n is 0 or 1; X 1 and X 2 each are C 1-3 alkyl or alkoxy or hydrogen, provided that when one of X 1 and X 2 is hydrogen, the other must not be hydrogen; Y 1 and Y 2 each are hydrogen, fluorine, or chlorine; Q is C 1-8 saturated or unsaturated alkyl in which all or part of the hydrogen atoms are replaced by a halogen atom; and L is oxygen atom or a single bond.) |