31942-21-9, 聚(3,3',4,4'-二苯甲酮四羧基二酸酐-co-4,4'-氧代二苯胺/1,3-苯二胺)酰胺酸, POLY(3,3',4,4'-BENZOPHENONETETRACARBOXYLIC DIANHYDRIDE-CO-4,4'-OXYDIANILINE/1,3-PHENYLENEDIAMINE), AMIC ACID
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