| http://www.w3.org/ns/prov#value | - and mixtures thereof, wherein each R is independently selected from the group consisting of hydrogen, alkyl having 1 to 40 carbon atoms, alkoxy having 1 to 40 carbon atoms, phenyl, substituted phenyl, higher aromatic such as naphthalene and anthracene, alkylphenyl having 6 to 40 carbon atoms, alkoxyphenyl having 6 to 40 carbon atoms, aryl having 6 to 30 carbon atoms, substituted aryl having 6 to 3
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