| http://www.w3.org/ns/prov#value | - wherein Ar311 to Ar314 are independently a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, R311 and R312 are independently a hydrogen atom, a substituted and unsubstituted aryl group having 6 to 50 ring carbon atoms or an alkyl group having 1 to 50 carbon atoms; and m and n are an integer of 0 to 4.
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