| http://www.w3.org/ns/prov#value | - aryl, C3-C20 heteroaryl, or C1-C30 hydrocarbyl containing one or more S, N, O, P, or Si atoms; a is independently in each occurrence 0 or 1; and n is an integer in the range of 3 to 1000. EC is an end cap group having the general formula *Ar.sub.pQ--R''
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