| http://www.w3.org/ns/prov#value | - referably 2 to 8 carbon atoms; such as a propargyl group and a 3-pentynyl group), aryl groups (each preferably having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, and particularly preferably 6 to 12 carbon atoms; such as a phenyl group, a p-methyl phenyl group, and a naphthyl group) can be cited.
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