| http://www.w3.org/ns/prov#value | - In these formulae, R1 is an optionally substituted univalent hydrocarbon group that is free of aliphatic unsaturated bonds and is exemplified by methyl, ethyl, propyl, or other alkyl groups; phenyl, tolyl, xylyl, or other aryl groups; benzyl, phenethyl, or other aralkyl groups; 3-chloropropyl, 3,3,3-trifluoropropyl, or other halogenated alkyl groups; most preferable are methyl and phenyl groups.
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