| http://www.w3.org/ns/prov#value | - In the above general formula (I), X represents O, S, an alkylene group having 1 to 6 carbon atoms such as methylene group, ethylene group, n-propylene group, isopropylene group and cyclopropylene group, an arylene group having 5 to 30 nuclear atoms or diphenylmethylene group.
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