| http://www.w3.org/ns/prov#value | - ##STR00003## where R.sub.8 is optional but when present is H or C1-C12 alkyl; W is a substituted or unsubstituted aryl group; or W is --OR.sub.9 wherein R.sub.9 is a straight or branched, substituted or unsubstituted, cyclic or acyclic alkyl
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