In organic chemistry, phthalic acid (θ|æ|l|ɪ|k|/ THAL-ik) is an aromatic dicarboxylic acid, with formula C6H4(CO2H)2 and structure HO(O)C\sC6H4\sC(O)OH. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale.
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