A novel smectic C liquid crystal compound useful as a component of ferroelectric liquid crystal materials capable of effecting a quick response is provided, which compound is a smectic C liquid crystalline 5-alkoxy-2-(4-alkoxyphenyl)pyrimidine compound expressed by the formula
 wherein ℓ represents an integer of 3 to 18 and m represents an integer of 6 to 18, but when ℓ represents 3 or 6, m represents 7 to 18.  
                            提供了一种新型的smectic C液晶化合物,可用作
铁电液晶材料的组分,能够产生快速响应,该化合物是一种smectic C液晶5-烷氧基-2-(4-烷氧基苯基)
嘧啶化合物,其
化学式为ℓ表示3至18的整数,m表示6至18的整数,但当ℓ表示3或6时,m表示7至18。