| http://www.w3.org/ns/prov#value | - R.sup.a6 denotes an alkyl group having 1 to 4 carbons or an aryl group, and n is an integer of 0 to 2,000. R.sup.a7 denotes an alkyl group having 1 to 4 carbons, an aryl group, or a monovalent group having the structure below. In the formula,
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