The compound (1) or (2), a composition containing the compound and a polymer obtained by polymerizing the composition. ##STR00001## R.sup.1 is fluorine, cyano, alkyl, and so forth; R.sup.2 is hydrogen, alkyl, and so forth; R.sup.3 and R.sup.4 are independently hydrogen, fluorine, alkyl, and so forth; A is 1,4-cyclohexylene, 1,4-phenylene, and so forth; X is a single bond, --COO--, --OCO--, and so forth; P is alkylene and so forth; m and n are independently 0, 1 or 2.