| http://www.w3.org/ns/prov#value | - In the formulae, Rx represents a group selected from the group consisting of an aryl group, a hydrocarbon group having from 1 to 4 carbon atoms, a hydrogen atom and a single bond, and examples of the hydrocarbon group include the hydrocarbon groups described for R2 that each have from 1 to 4 carbon atoms.
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