| http://www.w3.org/ns/prov#value | - may have a substituent, or an aryl group which may have a substituent, each of R8 and R9 is a hydrogen atom, a halogen atom, an alkyl group which may have a substituent, an aralkyl group which may have a substituent, or an aryl group which may have a substituent, and R8 and R9 may be identical to or different from each other.
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