| http://www.w3.org/ns/prov#value | - The aryl group represented by R25 is preferably an aryl group having from 6 to 10 carbon atoms, such as phenyl and naphthyl, and the substituted aryl group includes the above-described aryl group substituted by a halogen atom such as chlorine, an alkyl group such as methyl, or an alkoxy group such as methoxy or ethoxy.
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