| http://www.w3.org/ns/prov#value | - Acids such as terephthalic acid, pyromellitic acid, and 2,6-naphthalenedicarboxylic acid, which are primarily useful as starting materials for polyester fibers and resins, and diphenic acid, which is used in the pharmaceutical industry Will, in most cases, require additional purification to remove nitrogenous impurities.
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