| http://www.w3.org/ns/prov#value | - In the general formula (I), the symbol R denotes, each independently from the others, a monovalent hydrocarbon group having 1 to 10 or, preferably, 1 to 8 carbon atoms and free from aliphatic unsaturation exemplified by alkyl groups, e.g., methyl, ethyl, propyl, butyl, pentyl and hexyl groups, aryl groups, e.g., phenyl and naphthyl groups, and aralkyl groups, e.g. benzyl and 2-phenylethyl groups,
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