| http://www.w3.org/ns/prov#value | - Thus, any drug that bears an acidic or a basic functional group, for example, an amino group, a quaternary aliphatic or aromatic cationic group, and/or an anionic or acid group, including a carboxylic acid, phosphoric acid, phenol, sulfuric acid or sulfonic acid group, is suitable for use with an ion exchange resin.
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