| http://www.w3.org/ns/prov#value | - R5 represents a hydrocarbon group, preferably alkyl or alkenyl of from 1 to 22 carbon atoms, and more preferably is either a lower alkyl of from 1 to 4 carbon atoms, such as methyl, ethyl, propyl, n-butyl, or tertbutyl, or a higher alkyl or alkenyl of from 8 to 22 carbon atoms, especially from 10 to 18 carbon atoms.
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