| abstract |
A compound has a structure represented by the following formula (C1): n n n n n n n n n n n n wherein R a1 , R a2 , R a3 , R a41 , R a42 , R a43 , R a44 , R a45 , R a5 , R a6 , R a7 , R a8 , R a9 , R a10 , and R a11 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, an aralkyl group, an aryl group, a cyano group, a halogen atom, or a group obtained by combining two or more of the above groups, and a combination of R a1 and R a2 , R a41 and R a42 , R a42 and R a43 , R a43 and R a44 , R a44 and R a45 , R a5 and R a6 , R a8 and R a9 , or R a10 and R a11 each independently may form a ring. |