| abstract |
Means is a compound represented by the formula (1), a liquid crystal composition containing the compound, and a liquid crystal display element containing the composition. R is alkyl having 1 to 15 carbon atoms and the like; Ring A 1 and Ring A 2 are independently 1,4-cyclohexylene, 1,4-phenylene and the like; Z 1 and Z 2 are, independently, a single bond, -COO- and the like; Y 1 , Y 2 and Y 3 are independently hydrogen, fluorine or chlorine; m is 0, 1 or 2; |