phthalic acid

/F TH AE1 L IH0 K AE0 S AH0 D/
noun
  1. 1

    Any of three isomeric aromatic organic benzenedicarboxylic acids, C6H4(COOH)2; especially the ortho- isomer manufactured from naphthalene, used in the synthesis of dyes, perfumes and other compounds.

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Source: https://en.wiktionary.org/wiki/phthalic%20acid