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4,4'一二苯硫醚四酸二酐
polym. 3,3', 4,4'-diphenyl thioethertetracarboxylic dianhydride 3,3'，
3,3', 4,4'一二苯硫醚四酸二酐
polym. 6,3,4,4,-diphenylthioethertetracaboxylic dianhydride (DTDA)

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