| http://www.w3.org/ns/prov#value | - R2 may not be specifically limited so long as the same is monovalent hydrocarbon radical but a substituted or non-substituted monovalent hydrocarbon radical of a carbon number 1 to 8 will be the optimum, enumeratable examples of which will be such alkyl radicals as methyl radical, ethyl radical, propyl radical, butyl radical, pentyl radical, hexyl radical, heptyl radical, octyl radical and the lik
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