| http://www.w3.org/ns/prov#value | - where each R1 and R2, independently, is H or a substituted or unsubstituted alkyl (e.g., having between 1 and 5 carbon atoms, inclusive), and alkylamino (e.g., having between 1 and 5 carbons atoms, inclusive, such as ethylamino) or aryl group (e.g., phenyl), and each X??? is an exchangeable negatively charged counterion.
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