| http://www.w3.org/ns/prov#value | - In the above-described formula (1), X1 and X2 represent a leaving group, and preferable is a halogen atom, an alkylsulfonyloxy group which may be substituted by one or more fluorine atoms or an arylsulfonyloxy group which may be substituted by one or more alkyl groups, more preferable-is a halogen atom.
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