TWI795493B
In formula (1), a and b are independently 0, 1 or 2, and expressions: 0≤a+b≤3 hold, ring A1, ring A2, ring A3 and ring A4 are independently 1,4-cyclohexylene, for example, Z1, Z2, Z3, Z4 and Z3 are independently a single bond, alkylene having 1 to 10 carbons, or the like, Sp1 and Sp2 are independent...
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