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  5-[（3,5-二羧基苯基）甲基]苯-1,3-二羧酸

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  1,2-二(5-异酞酸基)乙烯

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  4,4'-(1,2-二氮酰)双-1,2-苯二甲酸

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  5,5'-[Methylenebis(oxy)]bis[1,3-benzenedicarboxylic acid]