A compound represented by the following formula (1):
wherein R1 and R2 are, for example alkyl; T1, T2 and T3 are independently tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl; A1 and A2 are, for example 1,4-cyclohexylene; Z1, Z2, Z3 and Z4 are, for example, a single bond; i, j, k, m and n are, for example 0 or 1; and i+j+k+m+n is, for example 2 or 3.
                            以下是由公式(1)表示的化合物:其中R1和R2可以是烷基;T1、T2和T3可以独立地是
四氢吡喃-2,5-二基或
四氢吡喃-3,6-二基;A1和A2可以是1,4-环己基;Z1、Z2、Z3和Z4可以是单键;i、j、k、m和n可以是0或1;且i+j+k+m+n可以是2或3。