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Subject Item
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s Of at least one kind selected from the group consisting of phenolic hydroxyl group, carboxyl group, thiophenol group, and sulfonic group; R3 is a divalent organic group having no phenolic hydroxyl group, carboxyl group, thiophenol group, and sulfonic group; and R2 and R4 each are a tetravalent organic group constituting a tetracarboxylic acid and a derivative thereof when R1 has one or more grou
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