| http://www.w3.org/ns/prov#value | - Preferred are alkyl groups having 1 to 2 carbon atoms, such as a methyl group and an ethyl group, and aryl groups having 6 to 9 carbon atoms, such as a phenyl group, a tolyl group, an ethylphenyl group, a dimethylphenyl group, and trimethylphenyl group, and more preferred are a methyl group and a tolyl group.
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