Bisphenol A-phosgene-tetrabromobisphenol A copolymer;4,4'-(1-Methylethylidene)bis[phenol]-4,4'-(1-methylethylidene)bis[2,6-dibromophenol]-poly[oxycarbonyloxy-1,4-phenylene(1-methylethylidene)-1,4-phenylene] copolymer
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