A liquid crystal compound represented by the following formula; ##STR1## wherein R.sup.1 and R.sup.2 each represents an alkyl group having 3-20 carbon atoms, and X represents a group ##STR2## or --O--, or a single bond, and a liquid crystal composition exhibiting optically tristable states comprising the liquid crystal compound represented by the above formula and an antiferroelectric liquid crystal compound.
一种液晶化合物,其
化学式为##STR1##其中,R.sup.1和R.sup.2分别表示具有3-20个碳原子的烷基基团,X表示一个基团##STR2##或--O--,或者一个单键。该液晶化合物与反
铁电液晶化合物混合后,形成一种具有光学三态稳定性的液晶组合物。