| http://www.w3.org/ns/prov#value | - R31 is a monovalent hydrocarbon group of 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms, which may have a hetero atom such as an oxygen atom, for example, straight, branched or cyclic alkyl groups, in which some hydrogen atoms are replaced by hydroxyl, alkoxy, oxo, amino, or alkylamino groups.
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