|p|-Phthalic acid (PTA) |p|-Phthalic acid (PTA) Synonyms: Benzene-1,4-dicarboxylic acid; P-Phthelic Acid; p-Phthalic acid; 1,4-dicarboxybenzene; 1,4-phthalicacid; Acide terephtalique; acideterephtalique; acideterephtalique(french); Benzene-p-dicarboxylic acid; Kyselina tereftalova; Kyselina terftalova CAS NO.: 100-21-0 Formula: C8H6O4 Weight: 166.13084