| http://www.w3.org/ns/prov#value | - R and R' which may be the same or different, represent hydrogen, an alkyl group preferably with 1 to 10 carbon atoms, more preferably with 5 to 10 carbon atoms, a cycloalkyl group such as cyclohexyl or cyclopentyl, an aryl group such as phenyl, an aralkyl group in particular a phenylalkyl group, the alkyl group having up to 4 carbon atoms such as benzyl or phenylethyl, or halogen such as chlorine
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