| http://www.w3.org/ns/prov#value | - R4 is a divalent hydrocarbon radical having at least 2 carbon atoms, R5 is selected from the group consisting of hydrogen, an alkyl radical having from 1 to 6 carbon atoms, an aryl radical, and an arylalkyl radical, R6 is a --C(O)R7 group where R7 is selected from the group consisting of a monovalent hydrocarbon group having from 1 to 20 carbon atoms and an aryl radical, and A- is an anion select
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