| http://www.w3.org/ns/prov#value | - divalent moiety having 1 to about 8 carbon atoms, such as about 2 6 carbon atoms, or about 2 4 carbon atoms; and x is about 1 6, such as about 1 4. R.sub.1 and R.sub.2 can linear or branched, saturated or unsaturated, or combination thereof. R.sub.1
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