| 摘要 |
A novel compound is disclosed. The compound is represented by a formula (I) below: <?in-line-formulae description="In-line Formulae" end="lead"?>Q<SUP>1</SUP>-SP<SUP>1</SUP>-X<SUP>1</SUP>-A-B-C-D-X<SUP>2</SUP>-SP<SUP>2</SUP>-Q<SUP>2 </SUP> (I)<?in-line-formulae description="In-line Formulae" end="tail"?> where, Q<SUP>1 </SUP>and Q<SUP>2 </SUP>respectively represent a polymerizable group; SP<SUP>1 </SUP>and SP<SUP>2 </SUP>respectively represent a spacer group; X<SUP>1 </SUP>and X<SUP>2 </SUP>respectively represent a linking group; and A, B, C and D respectively represent a divalent group selected from formulae IIa, IIb and IIc below: where, R<SUP>a</SUP>, R<SUP>b </SUP>and R<SUP>c </SUP>respectively represent a substituent group, na, nb and nc respectively represent an integer of 0 to 4, a plurality of R<SUP>a</SUP>, R<SUP>b </SUP>or R<SUP>c </SUP>may be same or different each other when na, nb and nc are respectively integers of 2 or more; provided that at least two of A, B, C and D is a divalent group represented by the formula IIa, or at least two of them is a divalent group represented by the formula IIb.
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