| http://www.w3.org/ns/prov#value | - Exemplary R groups include ethylene, n-propylene, isopropylene, the various butylenes including n-butylene, 1- and 2-methylpropylene, 1-propylethylene, 1-cyclohexylethylene, 1-phenylethylene, alkyl-substituted 1-phenylethylenes and propylenes, 1-benzylethylene, 2-amidopropylene, cyclohexyl-1,2-ene, phenyl-1,3-ene, the diethylene-ether --CH2 --CH2 --O--CH2 --CH2 --, the triethylene diether --CH2 --
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