| 摘要 |
The compound represented by formula (1). For example, the rings A1, A2, A3 and A4 are 1,4-phenylene, Z1 and Z2 are alkylene having 1 to 10 carbons in which at least one -CH2- may be replaced by -O- or -CH=CH-; L1, L2 and L3 are a single bond, -COO- or -CH=CH-; G1 and G2 area single bond or -O-; s, t and u are 0 or 1; and P1 and P2 is the group (P-1), the group (P-2) or the group (P-3). M1 and M2 are hydrogen or methyl. |
