| 摘要 |
An aromatic compound of the following formula (1), (2), (5) or (6), wherein, Ar1 and Ar3 represent a tetra-valent aromatic hydrocarbon group or a tetra-valent heterocyclic group, and Ar2, Ar4, Ar5, Ar6 and Ar7 represent a tri-valent aromatic hydrocarbon group or a tri-valent heterocyclic group, A1 represents —Z1—, —Z2—Z3— or —Z4═Z5—, wherein Z1, Z2 and Z3 represent O, S or the like and Z4 and Z5 represent N, B, P or the like, X1, X2, X3, X4, X9, X10, X11, and X12 represent a halogen atom or the like.
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