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4,一联苯四羧酸二酐
polym. 3,3', 4,4'-biphenyltetracarboxylic dianhydride 3,3',4,
3,3',4,4'一联苯四羧酸二酐
polym. 3,3,4,4-biphenyl tetracarboxy lie dianhydride (BPDA)