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Related to terephthalic acid: Isophthalic acid
terephthalic acid[¦ter·əf¦thal·ik ′as·əd]
C6H4(COOH)2 A combustible white powder, insoluble in water, soluble in alkalies, sublimes above 300°C; used to make polyester resins for fibers and films and as an analytical reagent and poultry-feed additive. Also known as para-phthalic acid; TPA.