| http://www.w3.org/ns/prov#value | - radicals, R.sup.6 and R.sup.7 are selected from divalent C.sub.(6-13) aryl hydrocarbon radicals and substituted divalent C.sub.(6-13) aryl hydrocarbon radicals, X is selected from --O--, --S--, --CH.sub.2 and ##STR4## a is 0 or 1, and n is a whole number
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