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C6H4CO2H2

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Phthalic \Phthal"ic\, a. [Naphthalene + -ic.] (Chem.)
   Pertaining to, or designating, a dibasic acid obtained by the
   oxidation of naphthalene and allied substances.

   {Phthalic acid} (Chem.), a white crystalline substance,
      {C6H4.(CO2H)2}, analogous to benzoic acid, and employed in
      the brilliant dyestuffs called the phthaleins.
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