Any of three isometric acids, C6H4(COOH)2, especially one (ortho-phthalic acid) obtained by oxidation of naphthalene of xylene and used in the manufacture of dyes, certain synthetic resins, etc.
structural formula of phthalic acid:
H C == O
C == C O -- H
/ \ /
H -- C C -- C
\\ // \\
C -- C O
H H phthalic acid
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