| http://www.w3.org/ns/prov#value | - Most often, however, all R.sup.1 radicals are hydrocarbon radicals.R.sup.1 preferably has the formula --A.sup.1 --Y--A.sup.2 --, wherein each of A.sup.1 and A.sup.2 is a monocyclic divalent aromatic radical and Y is a bridging radical in which one or two atoms separate A.sup.1 from A.sup.2.
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